材料专业 毕业设计_PbO对陶瓷结合剂磨具性能的影响的讨论.doc

毕业论文
题目: PbO对陶瓷结合剂磨具性能的影响的讨论

院系名称:材料科学与工程学院专业班级:
学生姓名: 学号:
指导教师: 教师职称:
2012 年 5 月 21 日
摘要
与其他结合剂相比陶瓷结合剂具有散热好、易于排屑、成本价格低等优点,陶瓷结合剂在超硬材料磨具行业应用广泛,本文研究PbO对陶瓷结合剂性能的影响,通过向基础陶瓷结合剂中加入不同百分量的PbO,对其耐火度进行了测定,利用微机差热膨胀仪、洛氏硬度计、微机控制电子万能试验机对加入不同量PbO结合剂的热膨胀系数和加入磨料后磨具的洛氏硬度和抗折强度进行了研究测试,再用体视显微镜对测过抗折强度的磨具试样进行断面观测分析。
实验所得结果显示:适当加入少量添加剂PbO能显著降低结合剂的耐火度,加入超过10%或更多对其耐火度影响不大。与不加和加其它量相比,当添加剂为5%时,加磨料后烧成的磨具具有较高的抗折强度和洛氏硬度;结合剂中加入添加剂PbO后,其热膨胀系数有所增大。通过体视显微镜断面观测,当加入过多量PbO时会有发泡产生;铅属于重金属,PbO有毒。
综合以上因素,PbO为陶瓷结合剂添加剂时,应控制在5%左右。
关键词: 陶瓷结合剂 PbO 性能影响
Title The effect of Lead oxide on properties of vitrified bond
Abstract
The pares the ceramic cement with other cements to have radiates, the easy escape of chips, the cost price low status merit, the ceramic cement to be widespread in the ultra hard material grinding tool profession application, this article studies PbO to the ceramic cement performance influence, through joins the different percentage quantity to the foundation ceramics cement in PbO, has carried on the determination to its refractoriness, using the puter difference heat expansion meter, the Rockwell tester, the puter control electron universal testing machines after did not join mensurability PbO cement thermal-expansion coefficient and joins the pound grinding tool Luo river degree of hardness and the anti-booklet intensity has carried on the research test, again used the stereoscope microscope to measure the anti-booklet intensity grinding tool test specimen carried on the cross section observation analysis.
Tests the obtained result to demonstrate that,Joins few chemical additive PbO to be able suitably obviously to reduce the cement refractoriness, joins surpasses 10% or more is not big to its refractoriness does not add and adds other quantities pare, when the chemical additive is 5%, adds the grinding tool which the pound after-burning es to have the high anti-booklet intensity and Luo river degree of hardness; In after the cement joins chemical additi