摘要
通过制备一种钛材铝基耐高温防氧化涂层以防止铸锭开坯过程中由于高温加热所造成的钛的损失以及氧化引起的表面缺陷,进而保护钛材;研究了涂层厚度和加热时间对涂层防氧化性能的影响。结果表明:由于该氧化保护涂层的主要组成是片状的金属铝粉末,一方面铝在加热过程中会与空气中的氧反应生成致密氧化层Al2O3,可有效地阻止氧的渗透;另一方面在高温加热过程中,铝和钛及钛合金可以发生反应,生成具有优良抗氧化性的TixAly相,能有效阻止钛的硬氧化层的形成从而起到保护基体的作用。在1 050℃恒温8 h条件下,涂层厚度在50150μm之间变化对涂层的抗氧化性能没有影响,随加热时间延长至16 h时,其抗氧化能力减弱。
In this work, a kind of high-temperature coating was prepared to protect titanium alloys from the titanium loss and surface defects during hot rolling caused by ingot oxidation in the high temperature soaking process. The effects of coating thickness and heating time on the anti-oxidation property of the coating were studied. Results showed that because the coating mainly consisted of flake-shape aluminum powders, which, on the one hand, reacted with oxygen to form a dense layer of oxidation film （Al2O3 ） that could effectively prevent oxygen from peime- ating into the substrate; on the other hand, react with titanium or titanium alloy to form an excellent anti-oxidation TixAly phase that could pre- vent the formation of hard titanium oxide layer during the high temperature heating process. In this way, the titanium substrate could be protected effectively. Besides, the variation of coating thickness from 50μm to 150 μm had no effect on the anti- oxidation property of the coating when held at 1 050 ℃ for 8 h; however, the anti-oxidation property was reduced as the holding time at 1 050℃ was further prolonged to 16 h.
出处
《材料保护》
CSCD
北大核心
2017年第11期82-85,共4页
Materials Protection
关键词
钛材
铝基耐高温涂层
三氧化二铝
防氧化性能
titanium alloys
Al- based high- temperature coating
Al2O3
anti- oxidation property
