Title :
Preparation and microstructure of TiB2/Al2O3 composite coating by melting in-situ reaction processing
Author :
Cao Lili ; Cui Hongzhi ; Chen Yunbo
Author_Institution :
Adv. Manuf. Technol. Center, China Acad. of Machinery Sci. & Technol., Beijing, China
Abstract :
TiB2/Al2O3 composite coatings were fabricated on a substrate of casting steel HT200 by melting in-situ reaction processing (MIRP) using Al-TiO2-B2O3 elemental powder blends. The phases, microstructure, element distribution of the coating were studied by means of XRD and EPMA. The results show that the coating contains TiB2 and AI2O3 phases. The microstructure has two main existing forms: one is TiB2 particles aggregated area, the other is the intermixed area of TiB2 and AI2O3. In the intermixed area, the granular TiB2 particles are in network distribution along the interface of AI2O3 phases. The Vickers microhardness of TiB2 particles aggregated area ranges from HV2400 to HV3800, and HV1800 to HV3200 for TiB2 and Al2O3 intermixed area, respectively.
Keywords :
Vickers hardness; X-ray diffraction; aggregation; alumina; coating techniques; coatings; composite materials; crystal microstructure; electron probe analysis; melting; microhardness; powder technology; titanium compounds; EPMA; TiB2-Al2O3; Vickers microhardness; XRD; alumina phase interface; casting steel HT200 substrate; composite coating; element distribution; elemental powder blends; granular particles; intermixed area; melting in-situ reaction processing; microstructure; network distribution; particle aggregated area; Coating; Melting In-situ Reaction Synthesis; Microstructure; composite;
Conference_Titel :
Advanced Technology of Design and Manufacture (ATDM 2010), International Conference on
Conference_Location :
Beijing
DOI :
10.1049/cp.2010.1341
