Two-piece ceramic bulb shell and manufacturing method thereof

Abstract

The invention belongs to the technical field of the preparation of electric light source materials, and particularly relates to a two-piece ceramic bulb shell and a manufacturing method thereof. The method comprises the steps as follows: a, a pair of green bodies of the ceramic bulb shell, which is in the same shape, is formed, wherein each green body comprises a capillary tube (1) and a cavity body (2); b, combining rings (3) are formed on combining surfaces of the cavity bodies; c, thin layers of slurry used for bonding are printed on the surfaces of the combining rings of the green bodies to be butted of the bulb shell; d, the two green bodies of the bulb shell are positioned through a fixture, so as to bond the slurry on the surfaces of the combining rings together; e, the connected bulb shell is dried, the green bodies bonded together are taken out after the slurry is dried, and after the connected bulb shell is roasted at a high temperature, the ceramic bulb shell with a two-piece structure is finally formed. The manufacturing method has the advantages of simple process, reliable butt joint manner, and no deformation and no dislocation of an appearance formed by butting the green bodies, and the like, and the integral transparent rate cannot be influenced after the bulb shell is roasted at a high temperature.

Description

technical field [0001] The invention belongs to the technical field of electric light source material preparation, and in particular relates to a two-piece ceramic blister and a manufacturing method thereof. Background technique [0002] At present, two-piece blisters generally adopt the method of interference fit to achieve docking, such as figure 1 As shown, firstly, two green bodies are molded separately, and there is a coupled concave-convex structure at the butt joint of the two green bodies. The two blanks are butted together, and then sintered at high temperature, and the butt joints are combined by interference fit to achieve airtight butt joint. [0003] In recent years, another method of connecting two-piece blisters has emerged, which is to form a ceramic body containing more bonding materials. The two bodies have the same shape. After the joint surface is heated and softened, the two ceramic bodies are combined in the fixture, and then deglue and...

AI Technical Summary

Problems solved by technology

[0004] The butt joint of the two-piece bulb shells by interference fit is achieved by the different shrinkage rates during the sintering process, so it is necessary to form two green bodies with different shrinkage rates and different joint surface structures, and then choose different pre-firing temperatures For pre-firing, the process is more complicated and difficult to control. In addition, the wall thickness of the bulb connected by interference fit needs to be increased, which will also affect the light transmittance of the bulb, and ceramic bulbs may occur in each assembly and sintering step. Component misalignment or defects such as bonding force and air tightness

[0005] The method of butt-joining two-piece bulbs by heating is to form a pair of blanks containing a large amount of adhesive material, and heat the joint to melt the blanks and combine the two components together under external force. Therefore, In the subsequent process, it is difficult to drain a large amount of bonding materials in the green body. For transparent alumina ceramic bulbs, impurities inside are a fatal problem that affects performance. In addition, the green body becomes soft as a whole due to heat conduction. Applying external force, it is easy to deform the green body during the docking process

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