Grain Size and Adhesion Strength of the V8C7 Coatings Produced In Situ

• Published in: Materials science forum Vol. 898; pp. 1381 - 1387
• Main Authors: Zhang, Xi, Wang, Xin, Wu, Hong, Zhong, Li Sheng, Xu, Yun Hua, Fu, Yong Hong
• Format: Journal Article
• Language: English
• Published: Pfaffikon Trans Tech Publications Ltd 19.06.2017
• Subjects: Adhesive strength; Cast iron; Coating; Diffraction; Electron microscopes; Grain size; Gray iron; Plating; Raw materials; Scanning electron microscopy; Vanadium carbide; X-ray diffraction; Grain Size; Adhesion Strength; In Situ; V8C7 Coating
• ISSN: 0255-5476; 1662-9752; 1662-9752
• DOI: 10.4028/www.scientific.net/MSF.898.1381

The vanadium carbide (V8C7) coating was fabricated by in situ reaction which used gray cast iron and vanadium plate as raw materials providing carbon and vanadium sources, respectively. The microstructure, phases, and adhesion strength of V8C7 coating were investigated by scanning electron microscope (SEM), X-ray diffraction (XRD) and a single scratch test. The XRD results showed that the coating consisted of V8C7 and α-Fe, with the peaks of (222), (400), (440), (622) and (444) of V8C7 phase were confirmed. Moreover, the average diameter (D) of the V8C7 particles in the range of 432~582nm was calculated on the basis of the Scherrer and Halder-Wagner equations. The critical load of interface between V8C7 and substrate was 98.3 N, which implied that the interface of V8C7 coating /substrate had excellent adhesion strength.