Effect of sintering procedures on the gradient structure of graded cemented carbides with a cubic carbide-free layer
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摘要: 使用一步燒結法制備了表面含脫β層的梯度結構硬質合金,采用掃描電鏡、X射線衍射儀、電子探針微區分析儀觀察了梯度硬質合金的微觀形貌、相組成及成分分布情況,分析了脫β層梯度結構合金樣品的典型組織及燒結工藝對脫β層梯度硬質合金梯度結構的影響.結果顯示:隨著燒結溫度的提高和保溫時間的延長,脫β層的厚度均明顯增加,且脫β層的厚度與保溫時間的平方根基本呈線性關系;在同樣的燒結工藝條件下,脫β層的厚度隨著鈷含量的增加而增大,隨Ti(C,N)含量的增加而減小.Abstract: Graded cemented carbides with a cubic carbide-free layer(CCFL) in the surface were synthesized by one-step sintering.The microstructure,phase composition and element distribution of the graded cemented carbides were investigated by scanning electron microscopy,X-ray diffraction analysis and electron probe microanalyzer,respectively.The typical microstructure of the graded cemented carbides and the effect of sintering procedures on gradient structures in the graded cemented carbides were discussed in detail.It is shown that the depth of CCFL significantly increases with increasing sintering temperature and prolonging holding time,and there exists a linear dependence approximately between the depth of CCFL and the square root of holding time.The depth of CCFL becomes larger at a higher cobalt content,but narrows with increasing Ti(C,N) content for the same sintering procedure.
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Key words:
- cemented carbides /
- sintering /
- gradient structure /
- microstructure /
- phase composition
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