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There are three types of tungsten balls–pure tungsten ball, tungsten alloy ball and tungsten carbide ball.
Pure tungsten ball has the highest density among tungten balls, which iis over 19.2g/cm3. Pure tungsten ball also has the highest melting pointing. -
Grade: Hf+Zr;99.95%; Zr<0.5%/Zr<1%/Zr<2%
Diameter : 0.236 to 4.7inch (6mm to 120mm).Length: up to 236.22inch (6000mm)Standard: ASTM B737-10 -
There two kind of Iridium crucibles : flat bottom and curved bottom. Temperature field is the main character which affect the crystal growth. The most used crucibles is flat bottom , in some condition , changed the flat bottom to curved bottom can improved temperature field obviously . Can improve many crystal growth condition.
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A crucible is a container that can withstand very high temperatures and is used for metal, glass, and pigment production as well as a number of modern laboratory processes. While crucibles historically were usually made from clay, they can be made from any material that withstands temperatures high enough to melt or otherwise alter its contents