A ceramic member includes a perovskite compound including La, Ca, Mn, and Ti as main components, wherein the amount of Ti is about 5 parts by mole or more and about 20 parts by mole or less, the amount of Ca is about 10 parts by mole or more and about 27 parts by mole or less, and the total amount of La and Ca is about 85 parts by mole or more and about 97 parts by mole or less based on the total amount of Mn and Ti of 100 parts by mole.

A thermistor material composed of Ca.sub.1-xYb.sub.xCeNbWO.sub.8(0≤x≤0.2) can be used in a wide temperature range from 25 to 800° C. It is made from high-pure CaCO.sub.3, CeO.sub.2, NbO.sub.5, WO.sub.3 and Yb.sub.2O.sub.3. These ceramic materials with a scheelite structure can be obtained after mixing, grinding, calcination, pressing, cold isostatic pressing and high-temperature sintering, etc. The values of material constant B.sub.300° C./600° C. and ρ.sub.25° C. of thermistor materials are in the range of 6465K-6732K, 4.06×10.sup.7Ω.cm-8.63×10.sup.7Ω.cm. The thermistor material has a good thermostability and significant negative temperature coefficient (NTC) characteristic in the temperature range of 25° C. to 800° C., could be used as a potential for fabricating high-temperature thermistor sensors.

A method of making a hot surface igniter is described. A silicon carbide composition that includes both fines fraction and a coarse fraction is sintered in a nitrogen and argon reducing atmosphere in a manner that controls the incorporation of nitrogen with in the lattice of recrystallized silicon carbide. The controlled incorporation of nitrogen in the lattice provides enhanced control over heating and electrical properties, while simultaneously achieving a lower surface area fully recrystallized structure for oxidation resistance and long service life.

An NTC compound, a thermistor and a method for producing a thermistor are disclosed. In an embodiment an NTC compound includes a ceramic material of a Mn—Ni—O system as a main constituent, wherein the Mn—Ni—O system has a general composition Ni.sub.xMn.sub.2O.sub.4-δ, wherein y corresponds to a molar fraction of Ni of a total metal content of the ceramic material of the Mn—Ni—O system, which is defined as c(Ni):(c(Ni)+c(Mn)), and wherein the following applies: 0.500<x<0.610 and 0.197<y<0.240.

A composite that includes multiple first metal oxide particles containing at least one metal element that is at least one of Mn or Ni, and a first amorphous phase between the multiple first metal oxide particles and which contains the at least one first metal element.

A method includes blending a dielectric material including a titanate with a carbon-based ink to form a modified carbon-based ink. The method also includes printing the modified carbon-based ink onto a structure. The method further includes curing the printed modified carbon-based ink on the structure at a temperature that does not exceed about 250° C. In addition, the method includes processing the cured printed modified carbon-based ink to form a thick film resistor. Blending the dielectric material with the carbon-based ink causes the modified carbon-based ink to have a resistivity that is at least double a resistivity of the carbon-based ink.

The present invention relates to a process for the variable adjustment of the electrical insulation properties of varistor-containing composite materials with the aid of defined filler mixtures, to the use of such filler mixtures, and to composite materials having resistive and capacitive field-control properties comprising filler mixtures of this type.

A ceramic member includes a perovskite compound including La, Ca, Mn, and Ti as main components, wherein the amount of Ti is about 5 parts by mole or more and about 20 parts by mole or less, the amount of Ca is about 10 parts by mole or more and about 27 parts by mole or less, and the total amount of La and Ca is about 85 parts by mole or more and about 97 parts by mole or less based on the total amount of Mn and Ti of 100 parts by mole.

A PPTC device is provided. The PPTC device may include a first electrode and a second electrode, disposed opposite the first electrode. The PPTC device may include a PPTC layer, disposed between the first electrode and the second electrode, the PPTC layer comprising a polymer matrix formed from a thermoplastic polyurethane (TPU) material.

A ceramic member comprising a compound oxide of La, E and Mn, wherein AE is (i) Ca, or (ii) contains Ca and at least one of Sr and Ba with a total amount of Sr and Ba to a total of Ca, Sr and Ba of not more than 5 mol %, and a crystal system in a surface of the ceramic member is a monoclinic system.