The precursor of WC-12Co nano-composite powder is synthesized by the larruping method of spray drying and fixed bed technique,nanostructured WC-12Co cermet coatings are deposited by plasma flame spray.Microstructure of nanostructured WC-12Co cermet coatings is evaluated by using X-ray diffraction(XRD),scanning electron microscopy(SEM) and transmission electron microscopy(TEM).The nano-composite WC-12Co powders generally contain WC and Co,whereas the phases W2C,W and Co3C,Co3W9C4,Co3W3C/amorphous binder phases based on Co and nano-twins occur in coatings,the mechanism of formation of nanostructured WC-12Co cermet coatings is discussed on the basis of the microstructure in this paper.
Key words
plasma spray /
nanocomposite powder /
nanostructured coating /
microstructure /
mechanism of formation
{{custom_keyword}} /
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
References
[1] LIAO H,NORMAND B,CODDET C.Influence of coating microstructure on the abrasive wear resistance of WC/Co cermet coatings[J].Surface and Coatings Technology,2000,124(2-3):235-242.
[2] ALLEN C,SHEEN M,WILLIAMS J,et al.The wear of ultrafine WC-Co hard metals[J].Wear,2001,250(1-12):604-610.
[3] FANG Zhi-gang,EASON JIMMY W.Study of nanostructured WC-Co composites[J].Int J of Refractory Metals & Hard Materials,1995,13(5):297-303.
[4] WANG Ying-long,STEPHEN M H,JOHES P.Evaluation of thermally-sprayed ceremaic coatings using a noval ball-on-inclined plane stratch method[J].Wear,1998,218(1):96-102.
[5] STEWART D A,SHIPWAY P H,MCCARTN E Y D G.Abrasive wear behaviour of conventional and nanocomposite HVOF-sprayed WC-Co coatings[J].Wear,1999,225(2):789-798.
[6] 徐滨士,欧忠文,马世宁.纳米表面工程基本问题及其进展[J].中国表面工程,2001,(3):6-12.
[7] HE Jian-hong,SCHOENUNG J M.A review on nanostructured WC-Co coatings[J].Surface and Coatings Technology 2002,157(1):72-79.
[8] KEAR B K,MCCANDLISH L E.Chemical processing and properties of nanostructured WC-Co materials[J].Nanostructured Mater,1993,3(1):19.
[9] EI-ESKANDARAN Y M SHERIF,MAHDAY AMIR A,AHMED H A,et al.Synthesis and characterazions of ballmilled nanocrystallione WC and nanocomposite WC-Co powders and subsequent consolididations[J].Journal of Alloys and Compounds,2000,312(1-2):315-325.
[10] HE Jian-hong,SCHOENUNG J M.Review:nanostrucured coatings[J].Materials and Engineering A,2002,336 (1-2):274-319.
[11] 邓世均.高性能陶瓷涂层[M].北京:化学工业出版社,2004.
[12] STEWART D A,SHIPWAY P H,MCCARTNEY D G.Microstructural evolution in thermally sprayed WC-Co coatings:comparision between nanocomposite and conventional starting powders[J].Acta Mater,2000,48 (7):1593-1604.
[13] 徐滨士,朱绍华.表面工程的理论与技术[M].北京:国防工业出版社,1999.
[14] B B库吉诺夫著.等离子涂层[M].北京:科学出版社,1981.
{{custom_fnGroup.title_en}}
Footnotes
{{custom_fn.content}}
PDF(1159 KB)
