Preparation of highly preferred orientation TiB_2 coatings  

作　　者：LI Jun LI Bing JIANG Lushan DONG Zheng ＇e YE Yifu 

机构地区：[1]School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China [2]School of Resource and Environment Engineering, East China University of Science and Technology, Shanghai 200237, China [3]School of Fashion, Shanghai University of Engineering Science, Shanghai 201620. China

出　　处：《Rare Metals》2006年第2期111-117,共7页稀有金属（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China (No. 50204006)

摘　　要：This paper focuses on the preparation of titanium diboride （TiB2） coatings on the graphite substrate by continuous current plating （CCP） and pulse current plating （PIC） electrochemical techniques in fluoride electrolytes （LiF-NaF-KF） containing K2T1F6 and KBF4 as the electrochemically-active components at 700℃. Thick leveled and uniform coatings were obtained and were composed of relatively pure TiB2. The effect of the experimental parameters on the microstructure of the coatings was studied. The results showed the electrodeposition with PIC produced coatings with better quality, when compared with those obtained by CCP, under the conditions of the current density i = 0.6 A/cm^2, frequency = 100 Hz, and todtofr = 4/1. XRD analysis indicated that the preferred orientation of coatings is （110） plane, which is in accordance with the prediction of the two-dimensional crystal nuclei theory. The effect of a ratio of ton/toff and frequency on the crystal size, textule coefficient and microstress was also investigated.This paper focuses on the preparation of titanium diboride （TiB2） coatings on the graphite substrate by continuous current plating （CCP） and pulse current plating （PIC） electrochemical techniques in fluoride electrolytes （LiF-NaF-KF） containing K2T1F6 and KBF4 as the electrochemically-active components at 700℃. Thick leveled and uniform coatings were obtained and were composed of relatively pure TiB2. The effect of the experimental parameters on the microstructure of the coatings was studied. The results showed the electrodeposition with PIC produced coatings with better quality, when compared with those obtained by CCP, under the conditions of the current density i = 0.6 A/cm^2, frequency = 100 Hz, and todtofr = 4/1. XRD analysis indicated that the preferred orientation of coatings is （110） plane, which is in accordance with the prediction of the two-dimensional crystal nuclei theory. The effect of a ratio of ton/toff and frequency on the crystal size, textule coefficient and microstress was also investigated.

关 键 词：COATINGS titanium diboride ELECTRODEPOSITION molten salt 

分 类 号：O613.71[理学—无机化学] O645.4[理学—化学]