Molybdenum News Center

Graphite mill made 15mm * 15mm * 15mm * test piece using CSF-1A ultrasonic cleaner for cleaning the surface thereof, and dried for use. 
 

By a certain percentage of the Si powder, formulated as a water slurry of polyvinyl alcohol and grinding in a ball mill 1h. Dip coating method using a slurry of about 500μm thick on the graphite blocks. After dried at 110 ℃ 12h, and then for 2h at 1450 ℃ vacuum oven, the gradient can be prepared in the SiC coating on a graphite substrate. 
 

By a certain percentage of Mo and Si powders weighed using the same process described above for preparing a slurry Si-Mo. A dip coating method using slurry of the Si-Mo coated on the inner SiC, Si-Mo by controlling the number of dip coating the slurry on the different thickness of the Si-Mo SiC inner precoat slurry. Dried at 110 ℃ 12h, and then in a vacuum oven at 1420 ℃ resistance calcined 2h. 

 

Performance: (1) Si-MoSi2 thickness of the outer coating layer has a great influence on the oxidation resistance SiC/Si-MoSi2 prepared. Si-MoSi2 outer layer thickness of about 80μm, the coating at 1400 ℃ exhibited good high temperature oxidation resistance. Too thin or too thick against unfavorable oxidation. 

                         (2) After the coating surface oxide coating to form a complete, compact SiO2 glass layer is the root cause of the oxidation resistance of the material to improve 

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