为研究多物理场耦合烧结法的低温快速致密化烧结机制及其动力学,以纯铁粉为研究对象,采用Gleeble-1500D热模拟机和真空烧结炉,对纯铁粉压坯分别进行了多物理场耦合烧结和传统真空烧结,并对两种烧结方式下的烧结机制及烧结活化能进行了对比研究.结果表明,传统真空烧结时的烧结机制以体积扩散为主,多物理场耦合烧结时其低温阶段以体积扩散为主,而高温阶段是体积扩散和蒸发凝聚的综合作用;传统真空烧结的烧结活化能为80.435 kJ/mol,而多物理场耦合烧结时的烧结活化能为23.551 kJ/mol.结果表明,电场对粉末材料的低温烧结快速致密化具有重要的促进作用.
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