Abstract: Disclosed herein is a multilayer sintered ceramic body comprising at least one first layer comprising poly crystalline YAG, wherein the at least one first layer comprising poly crystalline YAG comprises pores wherein the pores have a maximum size of from 0.1 to 5 ?m, at least one second layer comprising alumina and zirconia wherein the zirconia comprises at least one of stabilized and partially stabilized zirconia, and at least one third layer comprising at least one of YAG, alumina, and zirconia, wherein an absolute value of the difference in coefficient of thermal expansion (CTE) between the at least one first, second and third layers is from 0 to 0.75×10-6/° C. as measured in accordance with ASTM E228-17, wherein the at least one first, second and third layers form a unitary, multilayer sintered ceramic body. Methods of making are also disclosed.

Abstract: Disclosed herein are plasma chamber components that comprise a ceramic sintered body comprising at least one first layer comprising a surface having a surface area and at least one crystalline phase of from 90% to 99.8% by volume of poly crystalline yttrium aluminum garnet (YAG), at least one second layer comprising alumina and zirconia wherein the zirconia comprises at least one of stabilized and partially stabilized zirconia, and optionally, at least one third layer comprising at least one selected from the group consisting of YAG, alumina, and zirconia.

Abstract: Disclosed herein is a sintered yttrium oxide body having a total impurity level of 40 ppm or less, a density of not less than 4.93 g/cm3, wherein the sintered yttrium oxide body has at least one grain boundary comprising silica in an amount of not less than 1 to not greater than 10 atoms/nm2 wherein the sintered yttrium oxide body has at least one surface comprising at least one pore, wherein no pore is larger than 5 ?m in diameter. A process for making the sintered yttrium oxide body is also disclosed.

Abstract: A spark plasma sintering tool. The tool comprises a die including an inner wall having a diameter that defines an inner volume configured to receive a ceramic powder, and an upper punch and a lower punch operably coupled with the die, wherein each of the upper and lower punches have an outer wall defining a diameter that is less than the diameter of the inner wall of the die thereby creating a gap from 10 ?m to 100 ?m wide between each of the punches and the inner wall of the die when at least one of the punches moves within the inner volume of the die. Also disclosed is a method of using the tool to create a large sintered ceramic body and a computer readable medium storing processor-executable instructions adapted to cause one or more computing devices to operate the tool.

Abstract: A method of making a sintered ceramic body comprising the steps of disposing a ceramic powder (5) inside an inner volume of a spark plasma sintering tool (1), wherein the tool comprises: a die (2) comprising a sidewall comprising inner and outer walls, wherein the inner wall has a diameter defining the inner volume; upper and lower punches (4,4?) operably coupled with the die, wherein each of the punches have an outer wall defining a diameter less than the diameter of the die inner wall, thereby creating a gap (3) between the punches and the inner wall when at least one of the punches are moved within the inner volume, and the gap is from 10 ?m to 70 ?m wide; creating vacuum conditions inside the inner volume; moving at least one of the punches to apply pressure to the ceramic powder while heating, and sintering; and lowering the temperature of the sintered body.

Abstract: A sintered ceramic body having at least one surface, the sintered ceramic body having a first crystalline phase comprising Al2O3 and from 8 vol. % to 20 vol. % of a second crystalline phase comprising ZrO2, wherein the first crystalline phase is a continuous matrix and the second crystalline phase is dispersed in the continuous matrix, wherein the sintered ceramic body has pores wherein the pores have a maximum pore size of from 0.1 to 5 ?m as measured by SEM, wherein sintered ceramic body exhibits a coefficient of thermal expansion of from 6.899 to 9.630×106/° C. across a temperature range of from 25-200° C. to 25-1400° C. as measured in accordance with ASTM E228-17, wherein the sintered ceramic body has a relative density of from 99% to 100% and has a density variation of from 0.2 to less than 5% across a greatest dimension.

Abstract: Disclosed is a ceramic sintered body comprising magnesium aluminate spinel of composition MgAl2O4 having from 90 to 100% by volume of a cubic crystallographic structure and a density of from 3.47 to 3.58 g/cc, wherein the ceramic sintered body is free of sintering aids. A method of making the ceramic sintered body comprising spinel is also disclosed.

Abstract: Disclosed is a joined ceramic body comprising a first ceramic portion comprising a first ceramic, a second ceramic portion comprising a second ceramic, and a joining layer formed between the first ceramic portion and the second ceramic portion. The joining layer has a bond thickness of from 0.5 to 20 um and comprises silicon dioxide having a total impurity content of 20 ppm and less. A method of making the joined ceramic body and a joining material are also disclosed.

Abstract: Disclosed is a cordierite sintered body comprising from 90 to 98% by volume of a cordierite crystal phase as measured using x ray diffraction, SEM and image processing methods wherein the cordierite sintered body has at least one surface comprising pores having a diameter of from 0.1 to 5 um as measured using SEM and image processing methods. The cordierite sintered body has a Young's modulus of about 125 GPa or greater, and volumetric porosity of less than about 4%. Methods of making the cordierite sintered body are also disclosed.

Abstract: Disclosed herein is a sintered ceramic body comprising from 90% to 99.9% by volume of polycrystalline yttrium aluminum garnet (YAG) as measured using XRD and image processing methods and a volumetric porosity of from 0.1 to 4% as calculated from density measurements performed in accordance with ASTM B962-17. The sintered ceramic body may have a total purity of 99.99% and greater and a grain size of from 0.3 to 8 ?m. A method of making the sintered ceramic body is also disclosed.

Abstract: A sintered yttrium oxide body having a total impurity level of 40 ppm or less, a density of not less than 4.93 g/cm3, wherein the sintered yttrium oxide body has at least one surface comprising at least one pore, wherein no pore is larger than 5 ?m in diameter. A process for making the sintered yttrium oxide body is also disclosed.

Abstract: One aspect relates to a biocompatible composite system, an implantable medical device, and a manufacturing method for a biocompatible composite system. The biocompatible composite system includes a printed multi-layer circuit board and a feedthrough. The circuit board includes at least one electrically conductive via. The feedthrough includes an insulating ceramic base material and at least one electrically conductive cermet pathway. The pathway is embedded into the base material to form an electrically conductive and hermetically sealed connection to the via of the circuit board. The feedthrough and the circuit board are integrated into one composite part.