Alumina composite monocrystal high-temperature tungsten metallization method
A technology of compounding single crystal and alumina, applied in the field of high temperature tungsten metallization of alumina compound single crystal, can solve the problems of high impurity content and uneven composition of metallized layer, and achieve dense metallized layer, uniform quality and uniform thickness. Effect
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Embodiment 1
[0033] This process is used for high temperature tungsten metallization of alumina composite single crystals in thermionic fuel elements. Among them, the material of alumina composite single crystal is alumina composite single crystal doped with yttrium oxide, the mass percentage of yttrium oxide is 3.5wt%, single crystal size: outer diameter Ф14.5mm, inner diameter Ф9.6mm, height 10mm, metal The chemical quality was evaluated by the sealing airtightness of alumina composite single crystal and niobium alloy.
[0034] (1) Pretreatment of alumina composite single crystal
[0035] Grind and polish the surface of the aluminum oxide composite single crystal to be welded so that the roughness Ra is 0.7 μm. Use cleaning agent to ultrasonically clean for 20 minutes, and rinse the cleaning agent with deionized water until there is no cleaning agent foam. The alumina composite single crystal was boiled in deionized water for 8 minutes, dehydrated with alcohol and dried in the air. In ...
Embodiment 2
[0049] This process is used for high temperature tungsten metallization of alumina composite single crystals in thermionic fuel elements. The composition of the alumina composite single crystal is the same as in Example 1, but the size is relatively large. The outer diameter of the single crystal is Ф36.5mm, the inner diameter is Ф31.5mm, and the height is 10.0mm. Confidentiality is evaluated.
[0050] (1) Pretreatment of alumina composite single crystal
[0051] The surface of the aluminum oxide composite single crystal to be welded is ground and then polished so that the roughness Ra is 0.5 μm. Use cleaning agent to ultrasonically clean for 30 minutes, and rinse the cleaning agent with deionized water until there is no cleaning agent foam. Boil the alumina composite single crystal in deionized water for 5 minutes, dehydrate it with alcohol, dry it in the air, and burn it in a hydrogen furnace at high temperature. The bisque firing process is: sintering temperature 1000°C;...
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