TY - CONF A1 - Gemeinert, Marion T1 - Zuverlässige Hochleistungskeramik durch moderne Prüfverfahren T2 - Materialica 2003 CY - Munich, Germany DA - 2003-09-15 PY - 2003 AN - OPUS4-4723 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gemeinert, Marion T1 - Keramik für Mikrosystemtechnik und Sensorik T2 - Materialica 2003 CY - Munich, Germany DA - 2003-09-15 PY - 2003 AN - OPUS4-4724 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Rabe, Torsten A1 - Gemeinert, Marion A1 - Schiller, Wolfgang Arno T1 - Development of Advanced Low Temperature Co-fired Ceramics (LTCC) KW - LTCC KW - Zero shrinkage sintering KW - Multilayer KW - Material development PY - 2004 SN - 1013-9826 VL - 264-268 SP - 1181 EP - 1184 PB - Trans Tech Publ. CY - Aedermannsdorf AN - OPUS4-5843 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gemeinert, Marion T1 - Glaskeramische LTCC-Folien und multilayer-Technologie für Mikrosysteme / intelligente Sensoren T2 - Sonderkolloquium BAM-BMWA Projekte CY - Berlin, Germany DA - 2003-09-15 PY - 2003 AN - OPUS4-5301 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Kuchenbecker, Petra A1 - Gemeinert, Marion A1 - Rabe, Torsten T1 - Ergebnisse eines Ringversuchs zur Partikelgrößenbestimmung von Feinstpulvern mittels Lasergranulometrie KW - Ringversuch KW - Partikelgrößenverteilung KW - Lasergranulometrie PY - 2005 SN - 0173-9913 SN - 0196-6219 VL - 82 IS - 13 SP - 297 EP - 301 PB - Göller CY - Baden-Baden AN - OPUS4-11812 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gemeinert, Marion T1 - Haftung vopn Korund-Schichten auf Inconel 617 T2 - Symposium Hochleistungskeramik 2006 (DGM/DKG) CY - Stuttgart, Germany DA - 2006-04-05 PY - 2006 AN - OPUS4-12489 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gemeinert, Marion T1 - Selection and characterization of ceramic micron- and nanometersized model particles known as potential wear products from artificial hip joints T2 - 10th International Conference of the European Ceramic Society; ECERS 2007 CY - Berlin, Germany DA - 2007-06-17 PY - 2007 AN - OPUS4-15077 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Dreßler, Martin A1 - Nofz, Marianne A1 - Gemeinert, Marion T1 - Rheology, UV-vis transparency and particle size of modified Yoldas sols N2 - Alumina sols were prepared using a modified Yoldas procedure, thus resulting in sols with high solids content, excellent long term stability and small particle size. PH-value ranged between 3.7 and 0.6. Sols were characterised using rheological, UV-vis transmission and particle size measurements. Depending on NO3-/Al molar ratio as well as solids content, sols vary. Analysis of reduced viscosities indicate the formation of chainlike polymeric species above a critical solids fraction. KW - Alumo-sol KW - Rheology KW - UV-vis-transparency PY - 2006 DO - https://doi.org/10.1007/s10971-006-6634-5 SN - 0928-0707 SN - 1573-4846 VL - 38 IS - 3 SP - 261 EP - 269 PB - Kluwer Academic Publ. CY - Dordrecht AN - OPUS4-16192 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gemeinert, Marion T1 - Fügeverbindungen für Mikrosensoren auf Basis von niedrig sinternden Submikron-Silberpasten T2 - Kolloquium des Ferdinand-Braun-Instituts für Höchstfrequenztechnik CY - Berlin, Germany DA - 2011-11-18 PY - 2011 AN - OPUS4-24866 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gemeinert, Marion T1 - Entwicklung eines zertifizierten Referenzmaterials für die Lasergranulometrie T2 - Jahrestagung der Deutschen Keramischen Gesellschaft 2012 CY - Nuremberg, Germany DA - 2012-03-05 PY - 2012 AN - OPUS4-25512 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gemeinert, Marion T1 - Development of the Certified Reference Material BAM-D001 for Particle Size Measurement by Laser Diffraction Methods T2 - 1. International Scientific Conference "Reference Materials in Measurement and Technology" CY - Yekaterinburg, Russia DA - 2013-09-10 PY - 2013 AN - OPUS4-29143 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gemeinert, Marion T1 - Development of the Certified Reference Material BAM-D001 for Particle Size Measurement by Laser Diffraction Method T2 - PARTEC 2013 CY - Nuremberg, Germany DA - 2013-04-23 PY - 2013 AN - OPUS4-28374 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - THES A1 - Gemeinert, Marion T1 - Über LTCC-Werkstoffe aus dem Stoffsystem CaO - La2O3 - Al2O3 - B2O3 N2 - Glaskeramische Komposite, deren Herstellung von Glas- und kristallinen Pulvern ausgeht, bieten vielfältige Möglichkeiten, Werkstoffeigenschaften, wie z.B. Sinterverhalten, thermische Dehnung, mechanische Eigenschaften, chemische Beständigkeit, dielektrische Eigenschaften und Oberflächenqualität für spezielle Anwendungszwecke gezielt einzustellen. Glaskeramische Kompositpulver können zu Folien verarbeitet werden, aus denen mittels der LTCC (Low Temperature Co-fired Ceramics)- Technologie keramische Multilayer hergestellt werden, die insbesondere für das Electronic Packaging von Mikrosystemen eingesetzt werden. Problematisch ist die beim freien Sintern der LTCC-Multilayer auftretende laterale Schwindung, die von relativ hohen Schwindungstoleranzen begleitet ist. Zur Vermeidung der lateralen Schwindung werden Zero Shrinkage-Techniken eingesetzt. Eine neue Möglichkeit Zero Shrinkage beim Sintern von LTCC-Multilayern zu erreichen, besteht in der Anwendung eines self-constrained Laminates. Hierbei wird ein Multilayer eingesetzt, der aus zwei unterschiedlichen Folienarten für innere und äußere Lagen mit deutlich verschiedenen Sintertemperaturen (ΔT > 50 K) aufgebaut wird. Die Entwicklung von LTCC -Werkstoffen, die als innere Lagen eines self-constrained Laminates zur Verringerung der lateralen Sinterschwindung auf nahezu Null eingesetzt werden können, war Gegenstand der vorliegenden Arbeit. Es wurden hierfür LTCC - Werkstoffe aus dem Stoffsystem CaOLa2O3-Al2O3-B2O3 untersucht, die bei Temperaturen unterhalb 800 °C dicht gesintert werden können. Ausgehend von der Entwicklung geeigneter Gläser auf der Basis von Calciumlanthanborat- sowie Calciumlanthanalumoboratgläsern wurden glaskeramische Komposite unter Zusatz von Korundpulver hergestellt. Die Komposite kristallisieren während des Brennprozesses nahezu vollständig. Aus der Glasphase kristallisiert Lanthanborat aus und aufgrund der festkörperchemischen Reaktion der calciumboratreichen Restglasphase mit dem Korund bilden sich vor allem Calciumalumoborat bzw. Calciumalumoboratoxid. Die Anteile an neuen Phasen bestimmen die thermischen und dielektrischen Eigenschaften der Werkstoffe. Die wichtigsten der sich bildenden kristallinen Phasen der Komposite, Lanthanborat und Calciumalumoboratoxid wurden separat hergestellt und charakterisiert. Das Sinter- und Kristallisationsverhalten sowie die thermischen und dielektrischen Eigenschaften der glaskeramischen Komposite wurden in Abhängigkeit von den entwickelten Gläsern, dem Volumenverhältnis von Glas- und kristalliner Komponente im Kompositpulver und der Brenntemperatur untersucht. Die entwickelten LTCC-Werkstoffe wurden bzgl. ihrer thermischen Eigenschaften an einen zuvor ausgewählten LTCC-Werkstoff für die äußeren Lagen eines self-constrained Laminates angepasst. Erzielt wurden die Eigenschaftswerte: TEC: ca. 5 x 10-6/K, εr: ca. 7 und tan δ: ≤ 1 x 10-3. Zur Überprüfung der Anwendbarkeit wurde der entwickelte LTCC- Werkstoff als innere Lagen in einem LTCC-Multilayer verarbeitet. Dadurch konnte die laterale Schwindung des Multilayers beim Sintern auf < 0,4 % verringert werden. N2 - Glass ceramic composites made of glassy and crystalline powders offer numerous possibilities for modifying material’s properties e.g. sintering behaviour, thermal expansion coefficient, mechanical behaviour, chemical durability, dielectric properties and surface quality for special use. Glass ceramic composite powders can be used for the production of ceramic green tapes which are processed by LTCC (Low Temperature Co-fired Ceramics)- technology to form ceramic multilayers for electronic packaging in microsystems. During free sintering of LTCC-multilayers a lateral shrinkage occurs which is connected with a comparatively high shrinkage tolerance. Different sintering technologies are used to avoid the lateral shrinkage. A new possibility to achieve a zero lateral shrinkage is given by use of a self-constrained laminate. Therefore a multilayer is produced of two different materials for inner and outer layers, showing different sintering temperatures (ΔT > 50 K). Object of this dissertation was the development of LTCC-materials, which can be used for inner layers of a self-constrained laminate to reduce the lateral shrinkage nearly to zero. Therefore LTCC-materials in the field of CaO-La2O3-Al2O3-B2O3, which can be sintered below 800 °C, were investigated. Starting from the development of adapted glasses based on calciumlanthaniumborate- and calciumlanthaniumalumoborate glasses glass ceramic composites were produced by the addition of corundum powder. The composites crystallize during the sintering process almost completely. Lanthanumborate crystallizes from the glassy phase and calciumalumoborate and calciumalumoboratoxide respectively is formed by a chemical solid state reaction of the residual glassy phase, which is enriched by calciumborate, and the corundum. The proportional relation of the new crystalline phases determines the thermal and dielectric properties of the material. The most important formed new crystalline phases lanthanumborate and calciumalumoboratoxide were prepared and characterized separately. The sintering and crystallisation behaviour as well as the thermal and dielectric properties of the glass ceramic composites were investigated in dependence of the developed glasses, the volume relation of glassy and crystalline components of the composite powder and the sintering temperature. The developed LTCC-materials were adapted to a chosen material for the outer layers of a selfconstrained laminate referring to their thermal properties (thermal expansion coefficient: ca 5 x 10-6/K, permittivity: ca 7, dielectric loss factor: ≤ 1 x 10-3). To control the suitability of the developed material it was used for the inner layers of a LTCCmultilayer. The lateral shrinkage of the multilayer during sintering was reduced to < 0,4 %. T3 - BAM Dissertationsreihe - 43 KW - LTCC KW - Glaskeramik KW - Keramikfolie KW - Hochleistungskeramik KW - Mehrschichtsystem PY - 2009 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-1154 SN - 978-3-9812354-6-3 SN - 1613-4249 VL - 43 SP - 1 EP - 139 PB - Bundesanstalt für Materialforschung und -prüfung (BAM) CY - Berlin AN - OPUS4-115 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Mieller, Björn A1 - Gemeinert, Marion A1 - Koppert, R. A1 - Bolte, J. A1 - Rabe, Torsten T1 - LTCC substrates for high performance strain gauges N2 - Recent advances in the development of high gauge factor thin-films for strain gauges prompt the research on advanced substrate materials. A glass ceramic composite has been developed in consideration of a high coefficient of thermal expansion and a low modulus of elasticity for the application as support material for thin-film sensors. Constantan foil strain gauges were fabricated from this material by tape casting, pressure-assisted sintering and subsequent lamination of the metal foil on the planar ceramic substrates. The sensors were mounted on a strain gauge beam arrangement and load curves and creep behavior were evaluated. The accuracy of the assembled load cells correspond to accuracy class C6. That qualifies the load cells for the use in automatic packaging units and confirms the applicability of the LTCC substrates for fabrication of accurate strain gauges. To facilitate the deposition of thin film sensor structures onto the LTCC substrates, the pressure-assisted sintering technology has been refined. By the use of smooth setters instead of release tapes substrates with minimal surface roughness were fabricated. Metallic thin films deposited on these substrates exhibit low surface resistances comparable to thin films on commercial alumina thin-film substrates. The presented advances in material design and manufacturing technology are important to promote the development of high performance thin-film strain gauges. T2 - CICMT 2012 - 8th International conference on ceramic interconnect & ceramic microsystems technologies CY - Erfurt, Germany DA - 16.04.2012 KW - LTCC KW - Thin-film substrate KW - Pressure-assisted sintering KW - Strain gauge PY - 2012 N1 - Geburtsname von Mieller, Björn: Brandt, B. - Birth name of Mieller, Björn: Brandt, B. SP - 000175 EP - 000180 (Session TP 4 / TP 43) AN - OPUS4-27567 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gemeinert, Marion A1 - Steinborn, Gabriele T1 - Stabilized dielectric barium titanate dispersions for sensor filling N2 - Resolution of special capacitive sensors can be improved enormously by replacement of the gaseous material between the capacitor plates by a ceramic dispersion with high permittivity. High dielectric liquid dispersions of ceramic submicron and nano barium titanate powders should be qualified as dielectric fluid with long-term shelf life for this use. Investigations for the production of stabilized barium titanate dispersions in aqueous and organic liquids by use of different dispersant aids were performed. Characterization of dispersed particles and agglomerates was done by use of zeta potential measurements for aqueous dispersions as well as particle sizing by laser diffraction, ultrasound spectroscopy and dynamic light scattering for aqueous and organic dispersions. Optimization of stability was evaluated by accelerated sedimentation measurements with an optical centrifuge. Best results were achieved for barium titanate dispersions in silicone oil. T2 - 91. Jahrestagung der deutschen keramischen Gesellschaft CY - Freiberg, Germany DA - 07.03.2016 KW - Stabilized dispersions KW - Barium titanate nanopowder KW - Particle size analysis PY - 2016 AN - OPUS4-35635 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Steinborn, Gabriele A1 - Gemeinert, Marion A1 - Schmidt, Wolfram T1 - Vergleich verschiedener Messverfahren zur Partikelgrößenanalyse am Beispiel von nanodispersem ZrO2-Pulver N2 - Fünf verschiedene Messverfahren wurden zur Partikelgrößenanalyse von nanodispersen ZrO₂-Pulver verglichen. Mit der Laserstreulichtanalyse, der dynamischen Lichtstreuung (heterodyne DLS und homodyne DLS-PCS), der Sedimentationsanalyse im Zentrifugalfeld und der Ultraschallspektrometrie wurden wässrige ZrO₂-Suspensionen mit verschiedenen Feststoffkonzentrationen hinsichtlich ihrer Partikelgrößenverteilung analysiert. Als Referenz diente die REM-Analyse zur Ermittlung der Primärpartikelgröße (ca. 40 nm). Mit den hier vorgestellten Messverfahren konnten in den entsprechenden Suspensionen nur Sekundärpartikel im Bereich von 105 nm bis 224 nm detektiert werden, die somit auf das Vorhandensein von Aggregaten bzw. harten Agglomeraten hinweisen. T2 - Tagung, Produktgestaltung in der Partikeltechnologie CY - Berlin, Germany DA - 23.04.2015 KW - Agglomeration KW - Nanopulver KW - Partikelgröße KW - Suspension PY - 2016 DO - https://doi.org/10.1002/cite.201500164 SN - 0009-286 X VL - 88 IS - 7 SP - 984 EP - 994 PB - WILEY-VCH CY - Weinheim AN - OPUS4-36960 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Wohlleben, W. A1 - Mielke, Johannes A1 - Bianchin, A. A1 - Ghanem, A. A1 - Freiberger, H. A1 - Rauscher, H. A1 - Gemeinert, Marion A1 - Hodoroaba, Vasile-Dan T1 - Reliable nanomaterial classification of powders using the volume-specific surface area method N2 - The volume-specific surface area (VSSA) of a particulate material is one of two apparently very different metrics recommended by the European Commission for a definition of "nanomaterial" for regulatory purposes: specifically, the VSSA metric may classify nanomaterials and non-nanomaterials differently than the median size in number metrics, depending on the chemical composition, size, polydispersity, shape, porosity, and aggregation of the particles in the powder. Here we evaluate the extent of agreement between classification by electron microscopy (EM) and classification by VSSA on a large set of diverse particulate substances that represent all the anticipated challenges except mixtures of different substances. EM and VSSA are determined in multiple labs to assess also the level of reproducibility. Based on the results obtained on highly characterized benchmark materials from the NanoDefine EU FP7 project, we derive a tiered screening strategy for the purpose of implementing the definition of nanomaterials. We finally apply the Screening strategy to further industrial materials, which were classified correctly and left only borderline cases for EM. On platelet-shaped nanomaterials, VSSA is essential to prevent false-negative classification by EM. On porous materials, approaches involving extended Adsorption isotherms prevent false positive classification by VSSA. We find no false negatives by VSSA, neither in Tier 1 nor in Tier 2, despite real-world industrial polydispersity and diverse composition, shape, and coatings. The VSSA screening strategy is recommended for inclusion in a technical guidance for the implementation of the definition. KW - Nanomaterial KW - Nanomaterial classification KW - Regulation KW - VSSA KW - Size measurement KW - Particle size PY - 2017 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-391450 DO - https://doi.org/10.1007/s11051-017-3741-x SN - 1388-0764 SN - 1572-896X VL - 19 IS - 2 SP - Article 61, 1 EP - 16 PB - Springer Nature AN - OPUS4-39145 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Mieller, Björn A1 - Gemeinert, Marion A1 - Rabe, Torsten A1 - Bolte, J. T1 - Low-temperature co-fired ceramic substrates for high-performance strain gauges N2 - Recent advances in the development of high gauge factor thin films for strain gauges prompt the research on advanced substrate materials. A glass ceramic composite has been developed in consideration of a high coefficient of thermal expansion (9.4 ppm/K) and a low modulus of elasticity (82 GPa) for the application as support material for thin-film sensors. In the first part, constantan foil strain gauges were fabricated from this material by tape casting, pressure-assisted sintering, and subsequent lamination of the metal foil on the planar ceramic substrates. The accuracy of the assembled load cells corresponds to accuracy class C6. That qualifies the load cells for the use in automatic packaging units and confirms the applicability of the low-temperature co-fired ceramic (LTCC) substrates for fabrication of accurate strain gauges. In the second part, to facilitate the deposition of thin-film sensor structures to the LTCC substrates, pressure-assisted sintering step is modified using smooth setters instead of release tapes, which resulted in fabrication of substrates with low average surface roughness of 50 nm. Titanium thin films deposited on these substrates as test coatings exhibited low surface resistances of 850 Ω comparable to thin films on commercial alumina thin-film substrates with 920 Ω. The presented material design and advances in manufacturing technology are important to promote the development of high-performance thin-film strain gauges. KW - LTCC KW - Thin-film substrate KW - Strain gauge PY - 2013 DO - https://doi.org/10.1111/ijac.12052 SN - 1546-542X SN - 1744-7402 N1 - Geburtsname von Mieller, Björn: Brandt, B. - Birth name of Mieller, Björn: Brandt, B. VL - 10 IS - 3 SP - 413 EP - 420 PB - American Ceramic Soc. CY - Westerville, Ohio AN - OPUS4-28301 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Kuchenbecker, Petra A1 - Gemeinert, Marion A1 - Rabe, Torsten T1 - Inter-laboratory study of particle size distribution measurements by laser diffraction N2 - Presented are results of an inter-laboratory study (ILS) for measurements of the particle size distribution of fine powders in wet dispersion by laser diffraction. In this proficiency test 32 participants from four countries took part. They utilized 13 different devices from 7 manufacturers. Three commercial powders (glass spheres and two silicon carbide powders) showing a median diameter of about 30, 10 and 1 µm (volume distribution), respectively, were chosen for the procedure. A homogeneity study was carried out after the units had been separated and bottled. All participants received their test samples including a description of the standard operating procedures based on ISO 13320:2009 – to ensure that experiments were performed in a consistent manner. Results were calculated using the Mie Theory. The general means and the precision of the results were estimated in accordance with ISO 5725-2:2002. The evaluation showed excellent values of repeatability standard deviation. Values of 4 to 21?% of the reproducibility standard deviation of the results were found in the particle size range above 1 µm. Much larger deviation between the labs was detected in the case of smaller particles. Differences in the design of the analyzers were unambiguously identified as the main reason for the large deviations. KW - Accuracy experiment KW - Inter-laboratory study KW - Laser diffraction KW - Micron and submicron powder KW - Particle size distribution PY - 2012 DO - https://doi.org/10.1002/ppsc.201000026 SN - 0934-0866 SN - 1521-4117 VL - 29 IS - 4 SP - 304 EP - 310 PB - Wiley-VCH Verl. CY - Weinheim AN - OPUS4-26721 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -