中文摘要：

运用渗硼技术改进金属钛及其合金的表面特性。以无水硼砂为主渗硼剂,无水碳酸钠为助熔剂和高温络合剂的渗剂体系,在电流密度为7.3 A/dm2,保温温度为900℃,通电时间为30 min的电解渗硼工艺下制备出复合硼化物表面层。通过热重与差热图谱确定几种硼砂-碳酸钠配比体系的初晶温度。对4种不同配比的渗硼剂试验得到的样品做XRD测试,分析了相结构。并对硼化物生长机理与结构进行了研究与分析。结果显示：质量比为8∶2的渗硼剂组成最优。纯硼砂电解的样品表面物相组成与二渗硼钛标准粉末的XRD完全吻合。钛金属表面主要生成TiB2与TiB;扫描电镜图像可知渗硼表面致密,TiB2与TiB分层较为明显;TiB厚度可达35μm,TiB2厚度为43μm。

英文摘要：

Electrolytic boriding technology was used to improve surface properties of titanium and titanium alloy. Boride coating was prepared by using anhydrous borax as main boriding agents, sodium carbonate as flux and high temperature complexing agent, operation current density is 7.3 A/dm2 at 900 ℃ for 30 min. Molten salt system was analyzed by DTA and TG method of thermal analysis and the liquidus temperature is confirmed. Boride coating in four proportion boronizing agent was characterized by X-ray diffraction （XRD） and phase structure of coating was analyzed. Thermodynamics research and analysis on the mechanism and structure of borides growth was carried out. The results show that the optimize quality for the boronizing agent composition is 8：2. XRD of surface samples preparated by pure borax electrolytic has the same composition with standard powder TiB2 perfectly and the results show that only TiB2 and TiB are formed in the coating. From scanning electron microscopy analyzing,the coating surface is density. TiB2 and TiB layer laminate obviously, and the thickness of TiB and TiB2 are 35 μm and 43 μm, respectively.