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摘要随着现代化工业的迅猛发展，具有高强度、高硬度、高耐磨性等优质性能的超细硬质合金应运而生，并迅速成为国内外研究领域的一大热点。然而影响超细硬质合金综合性能的因素很多，包括原料制备、烧结工艺、烧结方式、抑制剂等。本课题研究了Cr3C2、VC抑制剂单独添加与复合添加对超细WC-Co硬质合金组织与性能的影响，测量了所制试样烧结后的收缩比、孔隙率、组织与硬度等，并将所制备样品与多种市售样品进行了对比分析。 实验结果表明：在固相烧结条件下，单独添加Cr3C2或VC抑制剂与复合添加Cr3C2和VC抑制剂均可以抑制WC颗粒长大，且复合添加的效果更加明显；复合添加Cr3C2和VC抑制剂的试样WC颗粒尺寸为3um，最高硬度为1674.5HV0.3，最大烧结收缩比为68 %，最小孔隙度为2%，最大密度为11.49g/cm3；市售意大利样品的硬度可达2400HV0.3，WC最小颗粒尺寸为1um，中国样品的硬度为1859.5HV0.3，WC最小颗粒尺寸为2um，日本样品的硬度为1729.7HV0.3，WC最小颗粒尺寸为2.5um；分析表明，所制备样品组织与性能与市售样品的差异是由于实验采用固相烧结温度为1280℃，低于通常硬质合金液相烧结采用的烧结温度1340~1450℃。19595
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关键词 超细硬质合金 粉末制备 压制成型 烧结工艺 抑制剂
毕业论文设计说明书（论文）外文摘要
Title Study on the preparation of ultrafine cemented carbides
Abstract
With the rapid development of modern industry, ultra-fine cemented carbides with high strength, high hardness, high wear resistance and other properties emerged and quickly become a hot research field at home and abroad. However, many factors affect the overall performance of ultra-fine cemented carbides, including raw materials preparation, sintering process, sintering methods, inhibitors. Cr3C2 and VC inhibitors were added separately and together to study their effect on the overall performance of the ultra-fine cemented carbides in this project. The shrinkage ratio before and after sintering, the pore rate before corrosion, the hardness size, the structures after corrosion were measured so as to analyze overall performance of ultrafine WC-Co cemented carbides. The experimental results show that In solid-phase sintering conditions, adding Cr3C2 and VC inhibitors separately and together can improve the overall performance of cemented carbides,and the effect of adding together is more apparent. The WC particle size of adding Cr3C2 and VC inhibitors together is 3um, the hardness is 1674.5HV0.3, the sintering shrinkage ratio is 68%, the porosity is 2%, the density is 11.49g/cm3.The hardness of Italy sample in the market is 2400HV0.3, the WC particle size can be up to 1um. The hardness of Chinese sample is 1859.5HV0.3, the WC is 2um.The hardness of Japanese sample is 1729.7HV0., the WC is 2um.The highest hardness of the experimental sample is 1674.5MPa. Analysis showed that the difference between the sample’s microstructure and properties of commercially available sample preparation is due to experiments using solid-phase sintering temperature is 1280 ℃, the sintering temperature is usually lower than the liquid-phase sintering carbide used 1340 ~ 1450 ℃.
Keywords：Ultrafine cemented carbides Preparing powder
Pressure molding Sintering process Inhibitor
目次
1 引言 1
1.1 概述 1
1.2 发展现状 2
1.3 存在问题 2
1.4 粉末制备 3
1.5 烧结工艺 4
1.6 抑制剂 6
1.7 本课题研究内容与意义 6
1.8 本章内容小结 7
2 实验过程 8