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Influence of Ti and TiH 2 Additives on the Structure and Properties of Copper Alloys for Diamond Cutting Tools
Russian Journal of Non-Ferrous Metals ( IF 0.8 ) Pub Date : 2020-09-03 , DOI: 10.3103/s1067821220040069
P. A. Loginov , S. Vorotilo , D. A. Sidorenko , Yu. V. Lopatina , A. Okubayev , N. V. Shvyndina , E. A. Levashov

Abstract

The influence of titanium and titanium hydride additives on the structure, mechanical properties, and wear resistance of copper alloys intended for use as a binder of the diamond cutting tool is investigated. Powder mixtures Cu–Ti and Cu–TiH2 are fabricated by mechanical alloying in a planetary centrifugal mill. Such treatment makes it possible to form single-phased powders of the copper-based solid solution in the Cu–Ti system and two-phased powders based on copper with uniformly distributed TiH2 particles in the Cu–TiH2 system. It is established that the maximal mechanical properties are characteristic of the samples of compositions Cu–2.5% Ti and Cu–10% TiH2 (higher than for pure copper by a factor of 2.0–3.5). Hardening in such alloys is implemented according to the solid-solution mechanism and due to the formation of the Cu3Ti3O phase. Grains of this phase have higher dispersity in alloys where TiH2 is used as the titanium-containing additive, due to which high values of the bending ultimate strength (920 MPa) and hardness (114 HB) are attained. It is established according to the results of comparative tribological investigations that samples of the Cu–10% TiH2 composition possess the best wear resistance. The reduced wear of these samples after the test according to the “rod–disc” scheme is an order of magnitude lower than for pure copper and lower by a factor of 5 than for Cu–2.5% Ti samples.


中文翻译:

Ti和TiH 2添加剂对金刚石刀具用铜合金组织和性能的影响

摘要

研究了钛和氢化钛添加剂对打算用作金刚石切削刀具粘合剂的铜合金的结构,机械性能和耐磨性的影响。粉末混合物Cu–Ti和Cu–TiH 2是在行星式离心磨机中通过机械合金化制成的。这样的处理使得可以在Cu-Ti系统中形成铜基固溶体的单相粉末,并在Cu-TiH 2系统中形成具有均匀分布的TiH 2颗粒的铜基两相粉末。确定最大的机械性能是组成成分为Cu–2.5%Ti和Cu–10%TiH 2的样品的特征(比纯铜高2.0-3.5倍)。根据固溶机理并且由于形成了Cu 3 Ti 3 O相,在这种合金中进行了硬化。该相的晶粒在使用TiH 2作为含钛添加剂的合金中具有较高的分散性,因此可获得较高的弯曲极限强度(920 MPa)和硬度(114 HB)值。根据比较摩擦学研究的结果确定,Cu-10%TiH 2的样品成分具有最佳的耐磨性。根据“杆-盘”方案进行测试后,这些样品的磨损减少量比纯铜低一个数量级,并且比Cu-2.5%Ti样品低5倍。
更新日期:2020-09-03
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