含碳化物陶瓷粉芯丝材电弧喷涂层的结构和性能

Microstructure and Properties of Coatings Deposited by Arc Spraying Cored Wires with Carbide Ceramic

分别将WC、TiC、Cr3C2等碳化物陶瓷粉末与304不锈钢带轧制成3种粉芯丝材,采用电弧喷涂技术在Q235钢基体上制备铁基复合涂层。利用光学显微镜、SEM、XRD对3种涂层的形貌、相组成和磨损表面进行分析,并用湿砂橡胶轮磨损试验机（MLS-225）测试了涂层的抗磨粒磨损性能。结果表明,碳化物陶瓷粉末的加入使涂层的硬度和耐磨性显著提高,涂层的平均显微硬度值高达1100-1200 HV0.1。在本试验条件下,铁基复合涂层的耐磨性比Q235钢高6-18倍。塑性微切削和脆性剥落为涂层的主要磨粒磨损形式。

Three different cored wires holding the WC,TiC or Cr3C2 ceramic powders respectively were fabricated using 304 stainless steel sheath,ferrite-based composite coatings were deposited on the Q235 steel substrate by arc spraying. The microstrncture ,phase compositions and worn surface morphologies of the coatings were observed by means of optical, scanning electron microscopy and X-ray diffraction. The abrasion wear behavior of the coatings was examined by a MLS-225 wet sand-rubber wheel tester. The results show that carbide ceramic powders can obviously increase the hardness and abrasive wear resistance of the coatings, the average values of microhardness are about 1100 - 1200 HV0. 1. Under this experimental condition, the abrasive wear resistance of ferrite-based composite coatings is about 6 - 18 times higher than that of the Q235 steel, and the main abrasion wear forms of the coatings are plastic micro-cutting and brittle peeling.