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高密度钨合金具有良好的综合力学性能,是军民两用合金材料。由于钨熔点很高,一般只能通过液相烧结才能制备接近全致密的合金。为满足科技发展对高性能钨合金的需求,采用新方法、新工艺,设法降低液相烧结温度和缩短保温时间,制备具有高强度、高韧性的细晶、超细晶或纳米晶钨合金材料是发展趋势。采用新的烧结技术,如:固相烧结、两步烧结、微波烧结、放电等离子烧结等制备高密度钨合金成为近年该领域的研究热点,对这些新工艺的最新研究进展情况进行了介绍。
High-density tungsten alloy has good mechanical properties, military and civilian dual-use alloy material. Due to the high melting point of tungsten, it is generally only possible to prepare alloys close to full density by liquid phase sintering. In order to meet the demand of high-performance tungsten alloy for the development of science and technology, a new method and a new process are adopted to reduce the liquid phase sintering temperature and shorten the holding time so as to prepare a fine grain, ultrafine grain or nanocrystalline tungsten alloy material with high strength and high toughness Is the development trend. The use of new sintering technologies, such as solid phase sintering, two-step sintering, microwave sintering, spark plasma sintering and other high-density tungsten alloys, has become a research focus in this field in recent years. The latest research progress of these new technologies is introduced.