A ceramic substrate for a ceramic heater includes aluminum nitride, silicon nitride or silicon carbide as the main component for increasing mechanical strength and improving thermal shock resistance, and a proper additive for controlling thermal conductivity. A temperature gradient from a heating element to a power feeding electrode is reduced by providing a dimensional ratio of the substrate effective for preventing oxidation of a power feeding contact that contacts the electrode of the heating...

A ceramic heater (1) includes a ceramic substrate (2) having a heating surface (2a) for supporting and heating an object to be processed, a hearing element (6) provided in the substrate (2), and embossed portions (4) on the heating surface (2a) which contact the object. The number of the embossed portions (4) per unit area on the heat spot (3) is less than that on the rest of the heating surface (2a). When the average temperature of the heating surface (2a) is raised to reach a target temperatur...

A method of manufacturing a semi-permeable ceramic membrane and a semi-permeable ceramic membrane made by the method, the method including providing a mixture of at least two non-metallic mineral components comprising fine particles having an effective particle size of up to 1 .mu.m and coarse particles having an effective particle size of 1 .mu.m or above, the fine particles having a higher coefficient of thermal expansion than the coarse particles, suspending the mixture of fine and coarse par...

Disclosed is a deodorizer composition comprising magnesium and calcium phosphate compounds, capable of effectively removing various malodorous components from the atmosphere.

Provided is a piezoelectric ceramic capable of improving its piezoelectric properties. The piezoelectric ceramic comprises a rhombohedral perovskite structure compound such as (Na.sub.0.5 Bi.sub.0.5)TiO.sub.3, a tetragonal perovskite structure compound such as BaTiO.sub.3 and (K.sub.0.5 Bi.sub.0.5)TiO.sub.3 and an orthorhombic perovskite structure compound such as NaNbO.sub.3, KNbO.sub.3 and CaTiO.sub.3, or the rhombohedral perovskite structure compound, the tetragonal perovskite structure compo...

Porous ceramics are described, which are produced by a) mixing an aqueous solution of a suitable ionotropically orientable polyanion, either with oxides, hydroxides or hydrated oxides, which are present in the form of a sol, of the metals Al, Zr, Ti and Nb, or with finely crystalline oxides, hydroxides or hydrated oxides, which are present in suspension, of these metals, or with finely crystalline tricalcium phosphate or apatite which are present in suspension, b) bringing the mixed sol obtained...

A ceramic capacitor for operating at a suppressed self heat-generation and a low loss even in high voltage operating conditions, including a dielectric ceramic element assembly having two surfaces and made of a material selected from the group consisting of a dielectric composition of CaTiO.sub.3 --La.sub.2 O.sub.3 --TiO.sub.2 system, a dielectric composition of CaTiO.sub.3 --La.sub.2 O.sub.3 --TiO.sub.2 --SrTiO.sub.3 system, a dielectric composition of SrTiO.sub.3 --CaTiO.sub.3 system, a dielec...

A ceramic composite material, for example, a ceramic molded body or a layer obtained by pyrolysis of a starting mixture, containing at least one polymer precursor material and at least one filler, which has an average particle size of less than 200 nm. Such a composite material may be used, for example, for producing fibers, filters, catalyst support materials, ceramic sheathed-element glow plugs, metal-containing reactive composite materials, porous protective shells for sensors, ceramic or par...

A ceramic heater including a ceramic body and a heating element buried in the ceramic body under the surface of thereof is provided, wherein metal pads are disposed on the outside of the ceramic body and electrically connected to the heating element, outer leads are joined by a braze layer onto a metal plated layer covering each of the pads, and the braze layer contains an amount of 500 ppm or less by weight of palladium in a brazing metal material based on Au, Cu, or Ni. The plated layer may be...

Ceramic susceptor whose wafer-retaining face has superior isothermal properties, and that is suited to utilization in apparatuses for manufacturing semiconductors and in liquid-crystal manufacturing apparatuses. In plate-shaped sintered ceramic body 1, resistive heating element 2 is formed. Fluctuation in pullback length L between sintered ceramic body outer-peripheral edge 1a and resistive heating element substantive-domain outer-peripheral edge 2a is within .+-.0.8%, while isothermal rating of...