Abstract:
Ceramic materials are converted to materials with anisotropic thermal properties, electrical properties, or both, by forming the ceramics into composites with carbon nanotubes dispersed therein and uniaxially compressing the composites in a direction in which a lower thermal or electrical conductivity is desired.
Abstract:
A porous ceramic support for a gas separation membrane formed by sintering a green body containing grains of a refractory ceramic oxide with a high coefficient of thermal expansion and grains of a reactive binder precursor. Upon sintering, the reactive binder precursor reacts with at least one gaseous, liquid or solid reactant to create a reaction bond that binds the refractory ceramic oxide grains. The support configuration can be a tubular, flat plate, hollow fiber, or multiple-passageway monolith structure.
Abstract:
Composite materials formed of a matrix of fused ceramic grains with single-wall carbon nanotubes dispersed throughout the matrix and a high relative density, notably that achieved by electric field-assisted sintering, demonstrate unusually high electrical conductivity in combination with high-performance mechanical properties including high fracture toughness. This combination of electrical and mechanical properties makes these composites useful as electrical conductors in applications where high-performance materials are needed due to exposure to extreme conditions such as high temperatures and mechanical stresses.
Abstract:
A porous catalyst layer containing mixed conducting oxide is contiguous to a second surface (1a) of a selective oxygen-permeable dense continuous layer (1) containing mixed conducting oxide. A porous intermediate catalyst layer (3) containing mixed conducting oxide is contiguous to a first layer (1b) of the dense continuous layer (1). A porous reactive catalyst layer (4) provided with a metal catalyst and a support is contiguous to the porous intermediate catalyst layer (3) in a manner to sandwich between the dense continuous layer (1) and the porous reactive catalyst layer (4).
Abstract:
There is provided a process for producing high-purity magnesium hydroxide by reaction of magnesium or reactive magnesium compounds with hydroxy compounds yielding magnesium alkoxides, followed by hydrolysis to form magnesium hydroxide, or a process for producing magnesium oxide by calcination of magnesium hydroxide.
Abstract:
The present invention provides a method for readily and efficiently manufacturing a ceramic substrate having an excellent dimensional accuracy and small degree of warp comprising the steps of: preparing a non-sintered multilayer ceramic body formed by laminating ceramic layers and conductor layers; forming a multilayer ceramic body with constraint layers by adhering a first constraint layer and a second constraint layer on one major surface and the other major surface, respectively, of the multilayer ceramic body, the first and second constraint layers being prepared by dispersing a ceramic powder that is not sintered under the sintering condition of the multilayer ceramic body; firing the multilayer ceramic body with the constraint layers under the firing condition of the multilayer ceramic body; and removing the first constraint layer and the second constraint layer after sintering the multilayer ceramic body, wherein the thickness of the first constraint layer is made to be larger than the thickness of the second constraint layer, and the first constraint layer is provided on one major surface that is more largely contracted by firing.
Abstract:
An insulator ceramic composition making it possible to obtain a sintered material which can be fired at low temperature of 1000° C., can be co-sintered with Ag and Cu, exhibits superior mechanical strength, exhibits high Q value and is appropriate for using high frequencies, is provided. The insulator ceramic composition is composed of (A) an MgO—MgAl2O4 ceramic powder, and (B) a glass powder containing silicon oxide in a proportion of about 13 to 50 weight % in terms of SiO2, boron oxide in a proportion of about 3 to 60 weight % in terms of B2O3, and aluminum oxide in a proportion of 0 to about 20 weight % in terms of Al2O3.
Abstract translation:可以获得可在1000℃的低温下烧制的烧结材料的绝缘体陶瓷组合物可以与Ag和Cu共烧结,显示出优异的机械强度,显示出高的Q值并且适合于使用高 提供频率。 绝缘体陶瓷组合物由(A)MgO-MgAl 2 O 4陶瓷粉末组成,(B)以SiO 2为约13〜50重量%的比例含有氧化硅的玻璃粉末,比例为3的氧化硼 以B 2 O 3换算成60重量%,以Al 2 O 3换算为0〜20重量%的氧化铝。
Abstract:
An insulating ceramic includes a fired mixture of a MgO—MgAl2O4 ceramic and a borosilicate glass, in which MgAl2O4 crystal phase and at least one of Mg3B2O6 crystal phase and Mg2B2O5 crystal phase are the major crystal phases. The insulating ceramic can be obtained by firing at low temperatures of 1000° C. or less, can be fired in conjunction with Ag or Cu, has a high Q-value and satisfactory mechanical strength, and is suitable for use at high frequencies.
Abstract translation:绝缘陶瓷包括MgO-MgAl 2 O 4陶瓷和硼硅酸盐玻璃的烧结混合物,其中MgAl 2 O 4晶相和Mg 3 B 2 O 6结晶相和Mg 2 B 2 O 5结晶相中的至少一个是主晶相。 绝缘陶瓷可以通过在1000℃以下的低温烧成而获得,可以与Ag或Cu一起烧结,具有高的Q值和令人满意的机械强度,并且适用于高频。
Abstract:
An insulating ceramic includes a fired mixture of a MgOnullMgAl2O4 ceramic and a borosilicate glass, in which MgAl2O4 crystal phase and at least one of Mg3B2O6 crystal phase and Mg2B2O5 crystal phase are the major crystal phases. The insulating ceramic can be obtained by firing at low temperatures of 1000null C. or less, can be fired in conjunction with Ag or Cu, has a high Q-value and satisfactory mechanical strength, and is suitable for use at high frequencies.
Abstract translation:绝缘陶瓷包括MgO-MgAl 2 O 4陶瓷和硼硅酸盐玻璃的烧结混合物,其中MgAl 2 O 4晶相和Mg 3 B 2 O 6结晶相和Mg 2 B 2 O 5结晶相中的至少一个是主晶相。 绝缘陶瓷可以通过在1000℃以下的低温烧成而获得,可以与Ag或Cu一起烧结,具有高的Q值和令人满意的机械强度,并且适用于高频。