铜基粘结剂对金刚石锯片用铁基烧结体组织性能的影响

发布时间：2018-03-11 11:46

  本文选题：铜基粘结剂　切入点：铁基胎体　出处：《郑州大学》2017年硕士论文　论文类型：学位论文

【摘要】：金刚石锯片是一种常见的切削工具,尤其是在石材加工行业,其应用更是广泛。金刚石锯片由起切削作用的刀头和起支撑刀头作用的钢基体组成。铁基胎体刀头因其制造成本较低、质量较好而得到越来越广泛的应用。在金刚石锯片使用过程中,金刚石锯片刀头中的金刚石脱落是金刚石锯片最主要的失效形式。粘结剂是金刚石锯片刀头的重要组成部分,其主要作用是把金刚石与刀头骨架材料粘结在一起,对防止金刚石的脱落具有重要意义。本文主要采用光学金相显微镜观察、扫描电子显微镜观察、能谱分析、X射线衍射分析的组织分析方法,以及致密度测试、硬度测试、抗弯强度测试等性能测试手段,对市场上广泛应用的铜锡15粘结剂进行了研究,并研究分析了铜锡15粘结剂与还原铁粉形成的铜锡15粘结剂铁基胎体中铜锡15粘结剂的添加量以及铁基胎体的烧结温度对铁基胎体组织性能的影响;然后基于同样的方法和手段对自制的铜锌锡粘结剂进行了研究,并研究分析了铜锌锡粘结剂的添加量以及铜锌锡粘结剂铁基胎体烧结温度对铁基胎体组织性能的影响。结果表明,随着铜锡15粘结剂添加量的增多,铁基烧结体中白色富铜相越来越多,灰色富铁相越来越少,并且随着铜锡15粘结剂含量的增多,铁基烧结体致密度、硬度、抗弯强度均呈先增加后减少的趋势。随着温度的升高,铜锡15粘结剂铁基烧结体致密度越来越大,硬度和抗弯强度先增大后减小。铜锡15粘结剂铁基烧结体在铜锡15粘结剂含量为25wt.%、烧结温度为820℃时综合性能最佳。随着铜锌锡粘结剂含量的增加,铁基烧结体组织晶粒呈先减小后增大的趋势,并在铜锌锡粘结剂含量为20wt.%时,晶粒最细小。随着铜锌锡粘结剂含量增加,铜锌锡粘结剂铁基胎体的抗弯强度呈明显的先上升后下降的趋势,致密度和硬度均先升高最后趋于稳定。随着烧结温度的升高,铜锌锡粘结剂铁基烧结体晶粒越来越粗大,致密度和硬度先稍微上升,之后趋于稳定,抗弯强度一直呈降低趋势。在铜锌锡粘结剂含量为20wt.%、烧结温度为780℃时铜锌锡粘结剂铁基胎体综合性能最佳。与市场上应用的铜锡15粘结剂相比,自制的铜锌锡粘结剂在较少的添加量、较低的烧结温度下即可达到最佳综合性能。在两种铜基粘结剂各自的最佳添加量和最佳烧结温度下制成金刚石锯片,对锯片进行切削实验,分析发现,利用铜锌锡粘结剂制作的金刚石锯片刀头中金刚石裸露高度较高、金刚石与铁基胎体间的缝隙小,胎体对金刚石颗粒的把持力明显高于铜锡15粘结剂胎体。
[Abstract]:Diamond saw blade is a common cutting tool, especially in stone processing industry. The diamond saw blade is composed of cutting head and steel substrate which supports the cutting head. In the process of using diamond saw blade, diamond shedding in diamond saw blade is the most important failure form of diamond saw blade, and binder is an important part of diamond saw blade head. Its main function is to bond diamond with the skeleton material of the knife head, which is of great significance to prevent the diamond from falling off. In this paper, optical metallographic microscope and scanning electron microscope are used to observe the diamond. The microstructure analysis method of X-ray diffraction analysis, density test, hardness test, bending strength test and so on, are studied on the copper-tin 15 binder, which is widely used in the market. The effect of the amount of copper-tin 15 binder and the sintering temperature of iron matrix on the microstructure and properties of iron matrix was studied. Then, based on the same method and means, the self-made copper-zinc-tin binder was studied. The effect of the amount of copper, zinc and tin binder and the sintering temperature of the iron matrix binder on the microstructure and properties of the iron matrix was studied. The results showed that with the increase of the amount of copper, zinc and tin binder, the effect of sintering temperature on the microstructure and properties of the iron matrix was studied. The white copper-rich phase and gray iron-rich phase are more and more in Fe-based sintered body, and with the increase of copper-tin 15 binder content, the iron-based sintered body becomes denser and harder. The flexural strength increased first and then decreased. With the increase of temperature, the density of the iron based sinter with copper and tin 15 binder increased. The hardness and flexural strength increased firstly and then decreased. The comprehensive properties of the iron based sintering body were the best when the content of copper tin 15 binder was 25 wt. and the sintering temperature was 820 鈩，

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