Novel ceramic igniter and method of using the same

F - Mech Eng,Light,Heat,Weapons – 23 – Q

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F23Q 7/22 (2006.01) H05B 3/14 (2006.01)

Patent

CA 2243249

This invention relates to a ceramic igniter comprising: (i) a pair of conductive ends, (ii) a hot zone disposed between the conductive ends, the hot zone having a density of at least about 95 % of theoretical density and a composition comprising: (a) between about 50 and about 80 vol % of an electrically insulating material selected from the group consisting of aluminum nitride, boron nitride, silicon nitride, and mixtures thereof; (b) between about 10 and about 45 vol % of a semiconductive material selected from the group consisting of silicon carbide and boron carbide; and (c) between about 5 and about 25 vol % of a metallic conductor selected from the group consisting of molybdenum disilicide, tungsten disilicide, titanium nitride, and mixture thereof, and (iii) a support upon which the hot zone is disposed, wherein at least a portion of the hot zone has a thickness of no more than 0.019".

Cette invention concerne un allumeur en céramique comprenant: i) une paire d'extrémités conductrices, ii) une zone chaude située entre les extrémités conductrices, la zone chaude se caractérisant par une densité égale à au moins 95 % de la densité théorique, et une composition contenant: (a) entre environ 50 et environ 80 % en volume d'un matériau électro-isolant sélectionné dans le groupe formé par: nitrure d'aluminium, nitrure de bore, nitrure de silicium et des mélanges de ces derniers, (b) entre environ 10 et environ 45 % en volume d'un matériau semiconducteur sélectionné dans le groupe formé par: carbure de silicium et carbure de bore et (c) entre environ 5 et environ 25 % en volume d'un conducteur métallique sélectionné dans le groupe formé par: disiliciure de molybdène, disiliciure de tungstène, nitrure de titane et des mélanges de ces derniers; et (iii) un support sur lequel est disposée la zone chaude, cette dernière comportant au moins une partie dont l'épaisseur n'excède pas 0,019".

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