TiB2陶瓷粉末纳米化改性及其增强环氧复合涂层的制备与表征

低温条件下,以钛酸丁酯为原料,采用胶溶-回流方法在TiB₂粉体表面包覆纳米TiO₂颗粒。通过SEM、XRD、BET等分析检测方法对复合颗粒的表观形貌、包覆层相成分、比表面积等进行表征。结果显示,纳米TiO₂颗粒均匀离散地包覆在TiB₂粉体表面,包覆层主要为锐钛矿型相,TiB₂粉体纳米化改性后复合颗粒的表面粗糙度显著增加,比表面积较包覆前提高35倍以上。将包覆后的TiB₂粉体引入环氧树脂制备耐磨复合涂层,测得其磨损失重仅为包覆前复合耐磨涂层的50%,其耐磨性显著提高,并初步分析了复合耐磨涂层的摩擦磨损性能、磨损形貌及耐磨机理。

Preparation and Characterization of Nano-modification TiB2 Ceramic Particle and Its Reinforced Epoxy Composite coating

Using tetrabutyl titanate as the raw materials, the surface of TiB₂ powders was coated with TiO₂ nanoparticles prepared by the peptization and reflux method at low temperature. The surface morphology, the phase composition of coating layers and specific surface area of composite particles were characterized by SEM, XRD and BET, respectively. The results show that the TiO₂ nanoparticles are coated on the surface of powders uniformly and discretely and the main phase of coating layers is anatase. The surface of TiB₂ powders is rougher after nano-modification and the value of specific surface area of the composite particles is elevated by over 35 times compared with that before coating. Wear-resistant composite coatings are prepared by adding coated TiB₂ powders to epoxy resins. The abrasive loss of composite coatings decreases to 50% of the coatings filled with uncoated TiB₂ powders. Finally, the wear properties, worn surface morphologies and antiwear mechanisms of wear-resistance coatings were analyzed.