Determination of Total Carbon Content in WC-Ni-Al Powder by Combustion Gas Volumetric Method
Great progress has been made on the use of Ni3Al to replace the binder phase cobalt in conventional cemented carbides.The key to produce high quality cemented carbide is to improve the precision control of carbon content.In this paper,the total carbon content of cemented carbide powder with Ni3Al as binder phase was measured by combustion gas volumetric method with the traditional YHC-86 type high carbon analyzer.Experimental conditions such as reagent for improving the melting effect,sample melting temperature,oxygen flow rate of combustion analysis and absorption of mixed gas compression speed were investigated.The optimum analysis conditions are summarized as follows:there is no need to add reagents to promote melting,the furnace temperature is controlled to be 1 250 ℃ to 1 300 ℃,the oxygen flow rate is 400 ml/min,sample burning time is 3 min ± 10 s,mixed gas absorption rate is 14～18 s.Under this condition,the accuracy of WC-Ni-Al sample analysis is good,the standard deviation of repeated measurement is 0.013％,the relative standard deviation is 0.29％,and the carbon recovery rate is 98.70％～ 100.78％.
cemented carbideNi3Alcombustion gas volumetric methodtotal carbon content
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万方数据
维普
