Alumina tube for high pressure sodium lamp
专利汇可以提供Alumina tube for high pressure sodium lamp专利检索，专利查询，专利分析的服务。并且PURPOSE: To eliminate deformation due to temperature difference and elongate the life of an alumina tube by applying a coating of aluminum nitride on the surface of the alumina tube.
CONSTITUTION: On the surface of an alumina tube a coating Of aluminum nitride is applied. The thermal conductivity of the aluminum nitride is 320w/m.k and considerably higher than that of alumina, base material for a light emitting tube whose thermal conductivity is 20w/m.k. For this reason, in the case of the alumina tube having aluminum nitride coating applied on, beat generated within the tube due to heat generated by arc reaches the tube surface and then transfers rapidly in the aluminum nitride coating with high thermal conductivity, resulting in diffusion toward the end of the tube and besides in increase in heat amount radiated from the surface. Therefore, the temperature at the central part of the alumina tube decreases and thereby the deformation of the alumina tube due to temperature difference between the central part and end part of the tube becomes small and corrosion by sodium vapor can be reduced because of the temperature decrease of the central part.
COPYRIGHT: (C)1987,JPO&Japio，下面是Alumina tube for high pressure sodium lamp专利的具体信息内容。
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