摘要粗晶硬质合金与普通的硬质合金相比,具有较高的热导率、断裂韧性、抗热疲劳与抗热冲击性能,主要用于软岩的连续开采与公路、桥梁的连续作业及对性能要求较高的冲压模、冷墩模等。本文以 WC-10Co硬质合金为研究对象,通过调整原料粉末中粗(11um) 、细(2.5 um)碳化钨的比例来研究粗晶碳化钨粉末对烧结后样品收缩率,密度,微观组织和硬度的影响,并与市售样品做比较。当粗晶碳化钨粉末分别占总碳化钨粉末的 50%、40%、30%、20%时,制备样品的密度分别为10.40 g/cm3 、9.37 g/cm3 、9.72 g/cm3、9.98 g/cm3 ,体积收缩比分别为:4.01%、 9.31%、 1.14%、 8.41%;硬度分别为: 1190HV0.3、 1167HV0.3、 1111HV0.3、1091HV0.3;制备样品微观组织中包含尺寸为5~7um 和1~2um的颗粒,获得了粗晶硬质合金预期的粗、细 WC 颗粒混合组织,但样品的密度、体积收缩比、硬度与粗晶碳化钨粉末的加入量之间无明显对应关系;市售样品微观组织中包含尺寸为4~5um 和1~2um的颗粒,密度为11.73 g/cm3,硬度为1560HV0.3, 优于制备样品,20880
分析表明粉末混合工艺、 压制参数以及烧结温度过低可能是造成这种差异的原因。
毕业论文关键词 粗晶硬质合金 混合料 颗粒度 硬度 微观组织形貌
Title Study on the preparation of the coarse grained cemented carbide WC
Abstract
Thermal conductivity of coarse grained cemented carbide than other hard
alloy has higher rate, fracture toughness, thermal shock resistance and
thermal fatigue, And on the ultra coarse grain, coarse grain cemented
carbide WC-Co research, at present China is still in the initial stage.
Volume shrinkage ratio of sample, hardness and coarse tungsten carbide
powder has no obvious relation, The commercially available sample density
is 11.73 g/cm3
,hardness 1560HV0.3, preparation density up to 10.40 g/cm3
in the sample, the highest hardness of 1190HV0.3, thus the performance of
commercially available samples is better than that of the sample
preparation, analysis process of ball milling time inference experiments
in properly selected, pressing process load intensity inhomogeneity and
sintering temperature the too low to cause this effect. Contains the grain
size of 4~5um and 1~2um particles in the microstructure of commercially
available samples, and contains the grain size of 5~7um and 1~2um
particles in the microstructure of the samples prepared, this is due to
too short sintering time caused by the original coarse grain WC retained,
resulting in preparation of samples of coarse particles.
Keywords coarse grain cemented carbide mixture wet milling sintering
mechanical properties
目录
1 绪论 . 1
1.1 引言 1
1.1.1 硬质合金的概述 . 1
1.1.2 硬质合金的分类 . 1
1.2 粗晶硬质合金的性能特点和研究现状 1
1.2.1 粗晶硬质合金的性能 . 1
1.2.2 粗晶硬质合金的研究现状 . 2
1.3 粗晶硬质合金的制备 2
1.3.1 传统方法生产粗晶硬质合金的不足 . 2
1.3.2 粗晶硬质合金的增韧机理 . 3
1.3.3 WC-Co混合料的制备 3
1.4 实验的研究目的及内容 4
2 实验部分 . 5
2.1 实验原料与设备 5
2.1.1 原料粉末 5
2.1.2 实验设备 5
2.2 实验过程 5
2.3 实验结果的测量与观察 7
2.4 本章内容小结 7
3 实验分析 . 8
3.1 工艺参数的选择分析 8 粗晶WC硬质合金的制备研究+文献综述:http://www.751com.cn/cailiao/lunwen_12823.html