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Vacuum sintering of metal powder
2016-12-19
Vacuum sintering, often the loss of metal volatilization. Such as the loss of volatilization of cobalt when sintering the cemented carbide. By strictly controlling the degree of vacuum, even if the furnace pressure is not lower than the vapor pressure of the sintered metal component, the volatilization loss of the metal can be greatly reduced or avoided. Another problem with vacuum sintering is the decarburization of the carbonaceous material. This occurs mainly in the heating stage, the furnace residual gas in the oxygen, moisture and oxides of the powder can be carbon compounds in the carbon or material in the free carbon reacts to produce carbon monoxide with the furnace gas out. . Decarbonization of the carbonaceous material can be solved by increasing the carbon content in the powder material and controlling the degree of vacuum.
In order to increase the heating rate and the uniformity of the furnace temperature during vacuum sintering, an appropriate amount of gas (inert gas or hydrogen gas) can be introduced at the initial stage of sintering. Also, the cooling rate of vacuum sintering can be increased by circulating a gas cooling method. In order to prevent contamination of the vacuum system with the forming agent during sintering, the compact should be calcined prior to vacuum sintering to remove the forming agent.
In powder metallurgy, vacuum sintering is mainly used for sintering active metals and refractory metals such as beryllium, thorium, titanium, zirconium, tantalum, niobium, etc .; sintered hard alloy, magnetic alloy, tool steel and stainless steel; and sintering those easy to hydrogen, Nitrogen, carbon monoxide and other gases.
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