Method for producing integral ceramics metal halide electric arc tube

Abstract

The invention provides a method for producing an integral ceramics metal halide electric arc tube, comprising the following steps: step 1, preparing materials into slurry; step 2, producing a blank tube, i.e. injecting the prepared slurry into corresponding blank moulds with an injection machine, and taking out after the slurry is condensed to obtain blank tubes; step 3, producing a green body, i.e. placing the blank tube into a blow mould to blow an integral electric arc tube green body in smooth transition by air pressure; step 4, degreasing and removing plastic to the green body; step 5, presintering at a temperature of 1200-1400 DEG C; step 6, performing hydrogen sintering at a temperature of 1850-1950 DEG C; and step 7, cooling to obtain the integral ceramics metal halide electric arc tube. The invention has simple and reliable production technique and high yield, reduces the production cost and avoids pollution to environment.

Description

technical field [0001] The invention relates to the technical field of electric light sources, in particular to a method for manufacturing an integrated polycrystalline translucent alumina ceramic metal halide lamp (metal halide lamp) arc tube. Background technique [0002] Due to the characteristics of acid and alkali resistance, high temperature resistance and chemical stability of ceramic materials, metal halide lamp arc tubes made of ceramic materials have higher operating temperature, higher luminous efficiency and better color rendering than metal halide lamp arc tubes made of quartz. Therefore, ceramic metal halide lamps have been greatly developed in recent years and widely promoted in the field of lighting, which is the direction of human lighting development. [0003] At present, the arc tubes of ceramic metal halide lamps are mainly made of translucent polycrystalline alumina ceramics. Practice has proved that the integrated translucent polycrystalline alumina cer...

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Problems solved by technology

Chinese patents ZL97117991.3, ZL00122245.7, ZL03131897.5, ZL200610035124.9, ZL200610232512.9 disclose the manufacturing method of ceramic metal halide lamp arc tube, which is mainly made of 2-piece, 3-piece, 5-piece and other combinations Due to the uneven thickness of the ceramic tube, it is easy to accumulate high-temperature liquid metal halides at the cold end of the arc tube, which is very corrosive to the arc tube, resulting in light decay and failure of the lamp, resulting in uneven temperature distribution and stress concentration. break

The disadvantage of this method is that the removal process of the inner core material is slow and strict, and a little carbon residue will cause waste products, so the manufacturing cost of the inner core is very high, and volatile materials will also cause environmental pollution

Another method is as described in U.S. Patent US6620272B2: firstly manufacture the hollow body with symmetrical half-axis directions, and then use local heating to melt the adhesive on the butt joint surface, and apply pressure to bond them into a whole. More complicated, it is difficult to ensure a firm bond

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