纯钛的熔盐渗硼  

Molten Salt Boronizing of Pure Titanium

作　　者：黄波[1] 孙勇[1] 段永华[1] 彭明军[1] 陈帅[1] 刘晓梅[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093

出　　处：《材料科学与工程学报》2016年第1期105-108,172,共5页Journal of Materials Science and Engineering

基　　金：云南省教育厅科研基金重点资助项目(1405149502)

摘　　要：采用熔盐法(Na_2B_4O_7)对钛(TA2)表面进行渗硼实验。通过扫描电镜(SEM)、能谱(EDS)、X射线衍射(XRD)、显微硬度测试等分析手段,研究TA2渗硼后的物相组成、组织形貌、显微硬度。结果表明:渗层由外表层的TiB——2和内表层晶须状的TiB组成。XRD分析表明,渗硼后钛试样表面生成硼钛化合物,随保温时间的延长,TiB峰位变强。EDS分析得出,B原子扩散后,被基体钛吸附,形成过渡层,导致过渡层中的Ti含量减少,而B含量明显升高。渗硼层显微硬度由外层至内层逐渐减小,变化范围约为23000MPa～7500MPa,高于TA2基体的硬度。Molten salt horonizing experiment was carried out on a titanium plate （TA2） surface. Phase composition, microstructure and micro-hardness were characterized by means of scanning electron microscope （SEM）, energy dispersive spectrometer （EDS） and X-ray diffraction （XRD）. The results show that the boronizing layers are composed of outer thin TiB2 surface and inner TiB surface. The analysis of XRD patterns reveals that the B-Ti compounds are formed after boronizing. With the increase of B diffusion time, the peak intensity of TiB increase. The analysis of EDS indicates that B atoms are absorbed by titanium substrate, resulting in the Ti content decrease and the B content increase significantly over the horonizing layer. The micro-hardness of the horonizing layer, which is higher than TA2 matrix, decreases from the outer to the inner layer ranging from 7500MPa to 23000MPa.

关 键 词：TA2 Na2B4O7 熔盐渗硼 硼钛化合物 

分 类 号：TG146.23[一般工业技术—材料科学与工程]