钛合金固体渗硼工艺研究+文献综述
关键词： 纯钛 固体渗硼 渗剂 硬度 9038
毕业设计说明书（论文）外文摘要
Title study on pack boronizing technology of titanium
Abstract
A pack boronizing method was employed to modify the surface of commercial pure titanium, TA2. The samples were placed in a graphite crucible, which was filled with dry B4C powders. By using XRD, metallographic analysis and micro-hardness testing, we study the properties of the boride layer to determine the best boronizing process.
The experimental results show that the most suitable amount which was developed by pack boronizing contains 50% as B boronizing donor, 25% sodium carbonate without water as an activator, 25% carbon as a reducer, the remaining is filler. The pack boronizing of pure titanium was carried out at 850℃，910℃ and 1050℃ for 10.5h. Experimental results show that the thickness of the boride layer is related to temperature. Meanwhile 1050℃ has the most hardness and thickness. As a further extension of the holding time, the thickness and hardness of the boride layer have not increased significantly. But the increase in the amount of penetration the organization of the diffusion layer has more dense, thickness and hardness.
Keywords：pure titanium，solid-state diffusion of boron，boronizing powder，hardness
目 录
摘 要 I
Abstract II
目 录 III
1 绪论 1
1.1 TC4钛合金渗硼层 1
1.1.1 微观结构 1
1.1.2 耐腐蚀性 2
1.1.3 硬度 2
1.1.4 耐磨性 3
1.2 TC4钛合金固相法渗硼 4
1.2.1 固相法渗硼特点 4
1.2.2 TC4钛合金渗硼原理 6
1.3 TC4钛合金固相法渗硼剂 6
1.4 固体渗硼技术应用现状 8
1.5 研究内容 8
2 实验材料、设备及实验方法 9
2.1 实验材料与设备 9
2.1.1 渗硼材料 9
2.1.2 浸蚀试剂 9
2.1.3 实验设备 9
2.2 试验方法 9
2.2.1 TA2固体渗硼 9
2.2.2渗硼层组织与性能分析测试方法 11
3 实验分析与讨论 12
3.1 渗硼剂组成对渗层影响 12
3.2 渗硼剂用量对渗层影响 14
3.3 渗硼温度对渗层影响 15
3.4 渗硼时间对渗层影响 18
结 论 24
致 谢 25
参考文献 26
1 绪论
钛合金以其低密度、高比强度和优良的耐蚀性而广泛应用于航天、船舶、化工和生物医学等领域。在所有的钛合金中，TC4（Ti6Al4V）钛合金用途最为广泛，超过了钛合金总量的50%。但因钛合金的耐磨性能较差，尤其是粘着磨损较严重，硬度低，在还原性酸中的耐蚀性较差等缺点限制了其应用范围。近年来，许多学者开始关注钛合金的耐磨性问题，很多有效的沉积和扩散等表面改性技术被采用，其目的均是最大限度地提高钛合金的耐磨性，延长其使用寿命，减少资源浪费。