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

fYear

2010

fDate

23-25 Nov. 2010

Firstpage

443

Lastpage

446

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;

fLanguage

English

Publisher

iet

Conference_Titel

Advanced Technology of Design and Manufacture (ATDM 2010), International Conference on

Conference_Location

Beijing

Type

conf

DOI

10.1049/cp.2010.1341

Filename

6139061