TiB_2-SiC粉末喷雾造粒及其等离子喷涂沉积机理研究
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摘要
利用喷雾干燥对TiB_2-SiC复合粉末进行造粒,研究了浆料固含量、粘结剂含量及SiC含量对喷雾干燥粉体颗粒形貌等的影响。采用大气等离子喷涂技术,以抛光的石墨为基体,在不同预热温度和不同喷距下对TiB_2-SiC粉末进行粒子收集,研究不同工艺参数对TiB_2-SiC粒子铺展形貌的影响,并制备了TiB_2-SiC涂层。结果表明:当浆料固含量为50%,粘结剂含量为5%,SiC含量为10%时,喷雾造粒获得球形度高、流动性好的TiB_2-SiC粉末;随着基体预热温度的升高,喷距的增大,扁平粒子的溅射逐渐减弱,形成规则的圆盘状粒子;在等离子焰流作用下,TiB_2-SiC粒子熔化加速并与基体发生碰撞,熔融粒子扁平化,急速冷却凝固,不断堆叠、搭接为宏观涂层。
TiB_2-SiC composite powders were prepared by spray-drying, and the influence of slurry solid content, binder content and SiC contenton the particle morphology of the spray-dried powder were investigated. TiB_2-SiC flattening splats were collected on the polished graphitesubstrate by air plasma spraying under the condition of different substrate temperatures and spray distance. The influences of coating parameterson the splat morphology were investigated. Besides, TiB_2-SiC coatings were prepared by air plasma spraying. The results indicate that TiB_2-Si Cpowder with high sphericity and good fluidity is obtained by spray-drying when the solid content of the slurry is 50 wt%, the binder content 5 wt%,and the SiC content 10 wt%. With the increase of the substrate temperature and spray distance, the flat particles gradually decrease to form regulardisc-shaped particles. Under the flame of plasma, the melting of TiB_2-SiC particles accelerates and the particles collide with the substrate. Themolten particles are flattened, rapidly cooled and solidified. Therefore, the TiB_2-SiC particles are continuously stacked and connected as amacroscopic coating.
TiB_2-SiC composite powders were prepared by spray-drying, and the influence of slurry solid content, binder content and SiC contenton the particle morphology of the spray-dried powder were investigated. TiB_2-SiC flattening splats were collected on the polished graphitesubstrate by air plasma spraying under the condition of different substrate temperatures and spray distance. The influences of coating parameterson the splat morphology were investigated. Besides, TiB_2-SiC coatings were prepared by air plasma spraying. The results indicate that TiB_2-Si Cpowder with high sphericity and good fluidity is obtained by spray-drying when the solid content of the slurry is 50 wt%, the binder content 5 wt%,and the SiC content 10 wt%. With the increase of the substrate temperature and spray distance, the flat particles gradually decrease to form regulardisc-shaped particles. Under the flame of plasma, the melting of TiB_2-SiC particles accelerates and the particles collide with the substrate. Themolten particles are flattened, rapidly cooled and solidified. Therefore, the TiB_2-SiC particles are continuously stacked and connected as amacroscopic coating.
引文
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[2]Sánchez E,Moreno A,Vicent M et al.Surface&Coatings Technology[J],2010,205(4):987
[3]Behnam Lotfi,Zohred Sadeghian.Transactions of Materials and Heat Treatment(材料热处理学报)[J],2004,25(5b):1183
[4]Carpio P,Moreno R,Gómez A et al.Journal of the European Ceramic Society[J],2015,35(1):237
[5]Nandiyanto A B D,Okuyama K.Advanced Powder Technology[J],2011,22(1):1
[6]Tang Wenjun(唐文军),Fu Zhengyi(傅正义),Zhang Jinyong(张金咏)et al.Journal of Ceramics(陶瓷学报)[J],2006,27(4):370
[7]Fukμmoto M,Tanaka Y,Nishioka E.Materials Science Forum[J],2004,449-452(2):1309
[8]Yang K,Fukumoto M,Yasui T et al.Surface&Coatings Technology[J],2013,214:138
[9]Fukumoto M,Ohgitani I,Yasui T.Materials Transactions[J],2004,45(6):1869
[10]Zhang Xiaofeng(张小锋),Zhou Kesong(周克崧),Song Jinbing(宋进兵)et al.Journal of the Chinese Ceramic Society(硅酸盐学报)[J],2015,43(1):21
[11]Li Dachua(李大川),Zhao Huayu(赵华玉),Zhong Xinghua(钟兴华)et al.Journal of Inorganic Materials(无机材料学报)[J],2017,32(6):571
[12]Chen S Y,Ma G Z,Wang H D et al.Applied Surface Science[J],2017,409:277
[13]Bolelli G,Sabiruddin K,Lusvarghi L et al.Surface&Coatings Technology[J],2010,205(2):363
[14]Stunda-Zujeva A,Irbe Z,Berzina-Cimdina L.Ceramics International[J],2017,43(15):11 543
[15]Nishiura D,Shimosaka A,Shirakawa Y et al.Journal of Chemical Engineering of Japan[J],2010,43(8):641
[16]Wong T W,John P.Handbook of Nanoparticles[J],2016,52(13):329
[17]Miyazaki S,Nishiura D,Shimosaka A et al.Advanced Powder Technology[J],2011,22(1):93
[18]Morks M F,Tsunekawa Y,Okμmiva M et al.Journal of Thermal Spray Technology[J],2002,11(2):226
[19]Zagorski A V,Stadelmaier F.Surface&Coatings Technology[J],2001,146(1):162
[20]Shinoda K,Demura M,Murakami H et al.Surface&Coatings Technology[J],2010,204(21):3614