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至今,烧结硬质合金金相显微组织的显示多用化学浸蚀法进行。最有代表性的化学浸蚀剂是Muraka-mi’s试剂(成份为苛性碱和铁氰化钾)。也有用物理方法的,如热蚀法和蒸涂干涉层技术。借助于电解浸蚀方法显示硬质合金显微组织的文献也有发表。采用这些方法显示烧结硬质合金的显微组织都取得了一定效果。然而,由于硬质合金材料固有的特点,如显微组织细微(其中的碳化物、胶结金属固溶体和缺陷组织尺寸常小至1μ以下)、各组成相之间的耐腐蚀行为差异很大且可变化幅度很窄(碳化物几乎只经受碱性试剂浸蚀而胶结相又只和酸性试剂作用)以及胶结相的磁性等使得上述方法的应用受到一定的限制。
So far, Sintered Carbide metallographic microstructure shows the use of chemical etching method. The most representative chemical etchant is Muraka-mi’s reagent (caustic alkali and potassium ferricyanide). Also useful physical methods, such as thermal etching and evaporation interference layer technology. Literature showing the cemented carbide microstructure by means of electrolytic etching has also been published. The use of these methods show that sintered cemented carbide microstructure have achieved some results. However, due to the inherent characteristics of cemented carbide materials, such as microstructural microstructure (in which carbides, cemented metal solid solutions and defect microstructures are often as small as 1 μ), the corrosion behavior between the constituent phases varies greatly and can be The range of variation is very narrow (carbide is almost only subjected to alkaline etching and the cemented phase only works with acid reagent), and the magnetism of the cemented phase makes the application of the above method limited to some extent.