WC-Co硬质合金最新进展

发布时间：2018-06-08 19:21

本文选题：硬质合金 + 高硬度　；参考：《稀有金属》2015年02期

【摘要】：硬质合金是一种具有独特性能组合的材料,传统硬质合金的硬度与韧性是一对此消彼长矛盾体。随着硬质合金在相关产业应用的不断发展,对其性能的要求越来越高,故开发出同时具有高硬度和高韧性的新型硬质合金显得非常重要。综述了超细及纳米晶粒硬质合金、粗晶硬质合金、板状晶粒增强硬质合金、双相或混合结构硬质合金和功能梯度硬质合金5种在国内外实现了高硬度、高耐磨性与高韧性协调统一的新型硬质合金。由于硬质合金是利用粉末冶金技术制备的金属陶瓷复合材料,所以粉末原料的尺寸、形状以及烧结方式对所得到的产品的性能有非常重要的影响。分析了晶粒大小、微观结构、原料性能等对硬质合金硬度、耐磨性、韧性等宏观力学性能的影响,并对相关的强化机制进行阐述。这些新型硬质合金中,粗晶粒硬质合金常用于要求良好韧性的应用中;梯度微观结构硬质合金可用于定制性能,随着相关技术的发展将进一步开发其应用;虽然目前能制备出纳米粉末,但是烧结出真正的纳米微观结构仍存在问题;关于开发特殊粉末(如纳米粉末结构,板状晶体)和特殊微观结构(如双相硬质合金)都需更进一步的研究。
[Abstract]:Cemented carbide is a kind of material with unique properties. The hardness and toughness of traditional cemented carbide are a pair of contradictory materials. With the development of the application of cemented carbide in related industries, the requirement of its properties is becoming higher and higher, so it is very important to develop new cemented carbides with high hardness and toughness at the same time. Five kinds of ultra-fine and nano-grain cemented carbides, coarse-grained cemented carbides, plate-grain reinforced cemented carbides, dual-phase or mixed-structure cemented carbides and functionally graded cemented carbides are reviewed in this paper. A new type of cemented carbide with high wear resistance and high toughness. Because cemented carbide is a kind of cermet composite prepared by powder metallurgy technology, the size, shape and sintering method of powder material have a very important effect on the properties of the product. The effects of grain size, microstructure and properties of raw materials on the mechanical properties of cemented carbide such as hardness, wear resistance and toughness are analyzed. In these new cemented carbides, coarse grain cemented carbides are often used in applications requiring good toughness, gradient microstructure cemented carbides can be used for custom-made properties, and their applications will be further developed with the development of related technologies. Although nanocrystalline powders can be prepared at present, there are still problems with sintered true nanostructures; as for the development of special powders (such as nanocrystalline structures), Both plate crystals and special microstructure (such as dual-phase cemented carbides) need further study.
【作者单位】：硬质合金国家重点实验室;湖南大学材料科学与工程学院;
【基金】：湖南省自然科学省市(株洲)联合基金项目(13JJ8024) 硬质合金国家重点实验室项目(201403001)资助
【分类号】：TG135.5

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