摘要 硬质合金拥有高硬度、高强度的“双高”性能，同时具备耐高温、耐腐蚀的特质。当硬质合金的晶粒尺寸小于 0.5μm 时，它的性能会发生突变，在保持高硬度、高强度的同时也具备优异的断裂韧性和抗压强度。本实验通过对比分析市售国内样品与国外样品的成分组织性能，为实验室样品的研究分析提供给了一定思路，同时通过收集数据，总结碳化钨长大规律。研究表明：国外样品硬度为1087MPa，国内样品硬度为 1745.1MPa。国外样品虽然硬度低，但寿命是国内样品的三倍，是由于国外样品碳化钨均匀细小，而国内样品碳化钨粒径分布呈现双峰，晶粒出现了异常长大，而且尺寸较大；国外样品孔隙率及孔的尺寸也低于国内样品孔隙率，而大的孔隙易引起早期时效，降低性能。通过添加复合抑制剂，实验室样品碳化钨粒径能达到国外水平；使用回归方程能较好地拟合碳化钨长大规律，而且碳化钨长大对时间的变化更加敏感；烧结温度与烧结时间存在交互作用，影响碳化钨长大规律；含Co量越低，对烧结时间和烧结温度的变化越敏感。30105
毕业论文关键词 硬质合金 碳化物分布 回归 晶粒长大规律
Title Study on the preparation and structure property of ultrafine cemented carbides
Abstract Carbide has the "double high" performance as the high hardness and the high strength along with high- temperature resistance, corrosion-resistant qualities and it is called the "dental industry" with these excellent performance. Research shows that when the carbide grain size reaches less than 0.5μm, its performance will be mutated with the excellent fracture toughness and compressive strength as well as the high hardness, and high intensity, therefore having a wide range of applications in the field of modern science and technology. The literature shows that when nano-carbide grain size reaches less than 100μm, Carbide has more excellent and distinctive performance, therefore leading researchers national and international dedicated to pursuing the preparation for ultrafine grain cemented carbide with better overall performance. This research focuses on analyzing a sample Chinese and Japanese samples, and two sample prepared already to explore the difference between the samples while the regression mathematical analysis of grain growth is as important as well.
Keywords Ultrafine WC-Co cemented carbides Spectrum analysis regression mathematical analysis grain growth regular pattern
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
1.4.1机械法.3
1.4.2物理化学法.4
1.5烧结工艺.5
1.5.1放电等离子烧结（SPARKPLASMASINTERING）.5
1.5.2热等静压烧结（HOTISOSTATICPRESSINGSINTERING）.5
1.5.3凝胶离心成形.5
1.5.4液相烧结（LIQUIDPHASESINTERING）.6
1.6抑制剂.6
1.7本课题研究的目的及意义.6
2实验方案.8
2.1实验原料.8
2.2金相样品的制备.8
2.2.1实验仪器及材料.8
2.2.2金相显微试样的制备.8
2.3合金的表征与性能测定9
2.3.1腐蚀前孔隙度.9
2.3.2腐蚀后金相分析.9
2.3.3显微硬度的测定10
2.3.4SEM分析.10
2.3.5晶粒尺寸的测量10
3实验结果分析与讨论11
3.1市售国内外YG10样品的对比分析.11
3.1.1孔隙率对比分析11
3.1.2组织对比分析11
3.1.3成分对比分析13
3.1.4硬度对比分析16
3.1.5YG10对比分析总结17
3.2添加不同抑制剂的实验室样品的对比分析17 超细晶硬质合金的制备与组织性能研究:http://www.youerw.com/cailiao/lunwen_25642.html