Effect of Sintering Temperature on Graded Cemented Carbides with Beta Free Layer Prepared with Nitrogen Free Raw Material AITranslate

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Chinese Library Classification Number:TG135.5[一般工业技术—材料科学与工程]

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Graded cemented carbide with beta free layer was fabricated with nitrogen free raw material by adding a sintering step of micro-pressure nitriding before gradient sintering.The microstructure of the surface layer of the graded cemented carbide was investigated by SEM and the depth of beta free layer was measured by an image analysis tool.The results show that with the added micro-pressure nitriding(0.5kPa N2 partial pressure),the graded cemented carbide No.Co-8sintered at 1 420℃,1 450℃and 1 480℃for 1hhas beta free layer depths of 8μm,13μm and 24μm,respectively.However,the beta free layer depth is close to zero of the graded cemented carbide No.Co-6sintered at 1 420 ℃,and its beta free layer depths are also significantly less than those of No.Co-8sintered at the other two sintering temperature.With the same sintering process,the beta free layer depth of the graded cemented carbide prepared with nitrogen free raw material is obviously lower than that with Ti(C,N)-containing raw material.