Tungsten Crucible
Tungsten crucible is one of Tungsten metal products. It is mainly divided into sintering forming (applied to powder metallurgy technology), stamping forming, and spinning. Using tungsten bar turning processing forming (generally small size), welding forming a variety of, using pure tungsten plate, tungsten piece and pure tungsten bar by the corresponding process processing. Tungsten crucible can be used in vacuum inert gas below 2600 degrees.
Specification of Tungsten Crucible
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Supply Situation |
Dimensions |
Tolerance |
||
|
Diameter(mm) |
Height(mm) |
Diameter(mm) |
Height(mm) |
|
|
Sintering |
10-500 |
10-750 |
±5 |
±5 |
|
Forging |
10-100 |
10-120 |
±1 |
±2 |
|
Sintering and Machining |
100-550 |
10-700 |
±0.5 |
±1 |
Application of Tungsten Crucible
Because the melting point of tungsten is as high as 3410℃, tungsten crucible is widely used in the core container of sapphire single crystal growth furnace, quartz glass melting furnace, rare earth smelting furnace and other industrial furnaces, and its working temperature environment is generally above 2000℃. Especially for sapphire single crystal growth furnace, tungsten crucible with high purity, high density, no internal crack, precise size, bright and clean inside and outside wall, etc. plays a key role in the success rate of seed crystal, quality control of crystal drawing, decrystallizing and sticking pot and service life of sapphire crystal growth process.
Production Process of Tungsten Crucible
Tungsten crucible crucible materials mainly for the tungsten powder. Because the tungsten products hardness at room temperature is higher, therefore, no longer have commonly after sintering mechanical processing. So, it is not special requirements for tungsten powder. But in order to improve the high temperature strength of tungsten crucible and corrosion resistance, often joined by about 8% molybdenum powder for solid solution strengthening. Will the sifted tungsten, molybdenum pretend after mixed in proportion.
(1) mold design design tungstenk crucible mold, mainly consider the following parameters: the sintering rear axle to the shrinkage rate is approximately 12%, radial shrinkage rate is approximately 13%. External mold using soft mode, internal model USES the steel mould. Steel wall thickness is about 5 mm, the taper is approximately 0.4%, the mold wall should be clean, facilitate ejection, the rough side should be welded on the cross beam, facilitate hoisting.Latex ring cork sealed on both ends.
(2) molding and loading after ejection mould ready. When charging should be uniform thickness, to ensure consistent wall thickness after sintering, some measures should be taken when lifting, prevent the decline in press freedom.
Forming technology in cold isostatic pressing machine, pressure control between 200 ~ 220 mpa, keep 3 minutes, two levels of pressure relief and prevent the compact cracking phenomenon caused by unloading too fast.
After forming of tungsten crucible hoisted out compact, can install furnace sintering. But because of without sintered crucible compact size is larger, so will have to remove a layer of insulating material and on the second floor of induction coil, can put in tungsten crucible compact heating sintering
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