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US 6,049,065 AGranted
Ceramic heater, a method of making the same and a ceramic glow plug having the ceramic heater
AssigneeNgk Spark Plug Co., Ltd.
InventorMasahiro Konishi
Life of this patent
Estimating the term…
Abstract
In a ceramic heater a heating element is embedded in a basal ceramic body which is prepared with silicon nitride as a main constituent. MoSi.sub.2 particles are dispersed throughout the basal ceramic body. The MoSi.sub.2 particles have a granular diameter ranging from 0.1 .mu.m up to but not including 3.0 .mu.m. The MoSi.sub.2 particles range from 1.0% to 5.0% by weight.
Claims19
A ceramic heater comprising:
- a heating element embedded in a basal ceramic body, said ceramic body being prepared with silicon nitride as a main constituent;
- MoSi.sub.2 particles dispersed throughout said basal ceramic body, said MoSi.sub.2 particles having a granular diameter ranging from 0.1 .mu.m up to but not including 3.0 .mu.m;
- and
- said MoSi.sub.2 particles ranging from 1.0% to 5.0% by weight.
1 more element
A method of making a ceramic heater comprising the steps of:
- mixing Si.sub.3 N.sub.4 particles and MoSi.sub.2 particles with an addition of an oxide of a rare earth metal as a sintering aid so as to prepare a basal ceramic body, granular diameter of said MoSi.sub.2 particles ranging from 0.1 .mu.m to 3.0 .mu.m and ranging from 1.0% to 5.0% by weight contained in said Si.sub.3 N.sub.4 particles, MoSi.sub.2 particles and said oxide of the rare earth metal;
- embedding in said basal ceramic body a heating element, said heating element being primarily composed of a silicide, carbide or nitride of one or more metals selected from the group consisting of W, Ta, Nb, Ti, Zr, Hf, V, Mo and Cr;
- and
- sintering said basal ceramic body by means of hot press procedure in which said heating element is embedded.
1 more element
A ceramic heater comprising:
- a heating element embedded in a basal ceramic body, said ceramic body being prepared with silicon nitride as a main constituent;
- and
- MoSi.sub.2 particles dispersed throughout said basal ceramic body, said MoSi.sub.2 particles having a granular diameter ranging from 2.5 .mu.m up to but not including 3.0 .mu.m. said MoSi.sub.2 particles ranging from 1.0% to 5.0% by weight.
Dependencies are inferred from the claim text.