title: Enhancement of oxidation resistance via a self-healing boron carbide coating on diamond particles.
abstract: A boron carbide coating was applied to diamond particles by heating the particles in a powder mixture consisting of H3BO3, B and Mg. The composition, bond state and coverage fraction of the boron carbide coating on the diamond particles were investigated. The boron carbide coating prefers to grow on the diamond (100) surface than on the diamond (111) surface. A stoichiometric B4C coating completely covered the diamond particle after maintaining the raw mixture at 1200 °C for 2 h. The contribution of the boron carbide coating to the oxidation resistance enhancement of the diamond particles was investigated. During annealing of the coated diamond in air, the priory formed B2O3, which exhibits a self-healing property, as an oxygen barrier layer, which protected the diamond from oxidation. The formation temperature of B2O3 is dependent on the amorphous boron carbide content. The coating on the diamond provided effective protection of the diamond against oxidation by heating in air at 1000 °C for 1 h. Furthermore, the presence of the boron carbide coating also contributed to the maintenance of the static compressive strength during the annealing of diamond in air.
authors.affiliation: College of Construction Engineering, Jilin University, Changchun 130026, People's Republic of China.|Key Lab of Drilling and Exploitation Technology in Complex Conditions, Ministry of Land and Resources, Changchun, 130061, People's Republic of China.|State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, People's Republic of China.
authors.forename: Youhong
authors.initials: Y
authors.lastname: Sun
authors.affiliation: College of Construction Engineering, Jilin University, Changchun 130026, People's Republic of China.|Key Lab of Drilling and Exploitation Technology in Complex Conditions, Ministry of Land and Resources, Changchun, 130061, People's Republic of China.
authors.forename: Qingnan
authors.initials: Q
authors.lastname: Meng
authors.affiliation: College of Construction Engineering, Jilin University, Changchun 130026, People's Republic of China.|Key Lab of Drilling and Exploitation Technology in Complex Conditions, Ministry of Land and Resources, Changchun, 130061, People's Republic of China.
authors.forename: Ming
authors.initials: M
authors.lastname: Qian
authors.affiliation: College of Construction Engineering, Jilin University, Changchun 130026, People's Republic of China.|Key Lab of Drilling and Exploitation Technology in Complex Conditions, Ministry of Land and Resources, Changchun, 130061, People's Republic of China.|State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, People's Republic of China.
authors.forename: Baochang
authors.initials: B
authors.lastname: Liu
authors.affiliation: College of Construction Engineering, Jilin University, Changchun 130026, People's Republic of China.|Key Lab of Drilling and Exploitation Technology in Complex Conditions, Ministry of Land and Resources, Changchun, 130061, People's Republic of China.
authors.forename: Ke
authors.initials: K
authors.lastname: Gao
authors.affiliation: College of Construction Engineering, Jilin University, Changchun 130026, People's Republic of China.|Key Lab of Drilling and Exploitation Technology in Complex Conditions, Ministry of Land and Resources, Changchun, 130061, People's Republic of China.
authors.forename: Yinlong
authors.initials: Y
authors.lastname: Ma
authors.affiliation: State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, People's Republic of China.|Department of Materials Science, Jilin University, Changchun 130012, People's Republic of China.
authors.forename: Mao
authors.initials: M
authors.lastname: Wen
authors.affiliation: State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, People's Republic of China.|Department of Materials Science, Jilin University, Changchun 130012, People's Republic of China.
authors.forename: Weitao
authors.initials: W
authors.lastname: Zheng
references.citation: Phys Rev B Condens Matter. 1989 Sep 15;40(8):5649-5656
references.pmid: 9992602