Formation of titanium carbide layer by laser alloying with a light-transmitting resin
Formation of titanium carbide layer by laser alloying with a light-transmitting resin
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通过激光合金化与透光树脂形成碳化钛层
DOI：
10.1016/j.optlaseng.2016.07.007
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发表时间：
2017
影响因子：
4.6
通讯作者：
Hideki Hagino
中科院分区：
文献类型：
--
作者：
Takuto Yamaguchi;Hideki Hagino
随着燃料效率的不断提高，机械部件的轻量化正变得越来越重要，特别是在运输行业。钛和钛合金因其作为轻质材料和高比强度材料的突出潜力而被公认。然而，它们的摩擦学性能也很差，无法用于滑动部件。钛的摩擦学性能的提高将扩大钛在不同领域的应用，激光合金化是提高钛表面耐磨性的有效方法。与传统的表面改性技术相比，该工艺具有许多优点。许多研究人员已经报道了激光合金化作为一种提高钛耐磨性的技术的有效性。然而，该工艺有一个重要的缺陷，如裂纹或空洞等缺陷往往出现在激光合金化区。我们的小组执行了一种新的激光合金化工艺，使用透光树脂作为碳元素的来源。采用激光合金化技术，在纯钛表面预涂聚甲基丙烯酸甲酯(PMMA)，研究了涂层的显微组织和磨损性能。钛熔体与PMMA的热分解产物在基体与PMMA的界面处发生反应，形成激光合金化区。通过优化激光合金化条件，可以消除激光合金化区的裂纹。激光合金化区表面覆盖有一层碳化钛涂层，与WC-Co相比具有良好的滑动性能和耐磨性。
The weight reduction of mechanical components is becoming increasingly important, especially in the transportation industry, as fuel efficiency continues to improve. Titanium and titanium alloys are recognized for their outstanding potential as lightweight materials with high specific strength. Yet they also have poor tribological properties that preclude their use for sliding parts. Improved tribological properties of titanium would expand the application of titanium into different fields.Laser alloying is an effective process for improving surface properties such as wear resistance. The process has numerous advantages over conventional surface modification techniques. Many researchers have reported the usefulness of laser alloying as a technique to improve the wear resistance of titanium. The process has an important flaw, however, as defects such as cracks or voids tend to appear in the laser-alloyed zone.Our group performed a novel laser-alloying process using a light-transmitting resin as a source for the carbon element. We laser alloyed a surface layer of pure titanium pre-coated with polymethyl methacrylate (PMMA) and investigated the microstructure and wear properties. A laser-alloyed zone was formed by a reaction between the molten titanium and thermal decomposition products of PMMA at the interface between the substrate and PMMA. The cracks could be eliminated from the laser-alloyed zone by optimizing the laser alloying conditions. The surface of the laser-alloyed zone was covered with a titanium carbide layer and exhibited a superior sliding property and wear resistance against WC-Co.