High Density Metal Melting Graphite Crucible for Vacuum Evaporation Coating

Product Description

Graphite crucibles are widely used for gold silver platinum melting casting refinning Graphite crucible has more sizes, and not restricted to the production scale, quantity and smelting materials, it can be produced to any size, any quantity, and can ensure the purity of the smelting materials. The Material of Graphite Crucible:
The material of Graphite Crucible include Fine-grain Graphite, High Pure Graphite, and Isostatic Graphite. We will choose the material to produce the Graphite Crucible based on customer's different application, working temperature, thermal shock property, acid-base property. The physical and chemical index as below:

Item	Unit	Fine-grain Graphite	High pure graphite	Isostatic graphite
Max Grain Size	Dia	0.8mm	325mesh	5-22um
Bulk Density	g/cm3	1.73-1.76	1.68-1.85	1.8-1.85
Specific Resistance	µΩm	7.5	≤14	≤15
Bending Strength	Mpa	11-12.5	≥25	12.5
Compressive Strength	Mpa	27-34	≥50	34
Thermal Conductivity	W/(m .k)	150-160	≥130	160
C.T.E.(100-600)ºC	10-6/ºC	2.2	≤2.5	2.1
Ash Content	%	0.09	≤0.15	0.09

Graphite materials has the following characteristics:
1. High temperature resistance.
2. Good thermal conductivity.
3. Good corrosion resistance, long service life.
4. Small coefficient of thermal expansion, and it has a certain strain resistance to quench and heat.
5. Stable chemical property and hard to react.
6. Smooth inner wall, molten metal is not easy to leak and adhere to the inner wall of the crucible.

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