对放电等离子烧结(SPS)不同粒径匹配的WC/Co混合粉末的收缩过程进行了系统分析.结果表明,SPS烧结不同WC粒径混合粉末时,烧结体开始收缩温度、收缩速率峰值温度和致密化完成温度基本相同;对不同Co粒径混合粉末,三种温度随Co粉初始粒径的减小而降低,即SPS烧结过程与WC粒径无关而与Co粒径密切相关.SPS致密化过程中收缩速率随温度的变化、收缩速率与相对密度的关系均与常规烧结不同,其开始收缩温度和收缩速率峰值温度均较常规烧结低,同时收缩速率峰值处所对应的相对密度也较常规烧结低.这说明在常规烧结中粉末在大量液相出现(即收缩速率出现峰值时)之前已完成很大程度的收缩致密化,而SPS烧结中大量液相出现之前粉末的收缩致密化程度较低.
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