Heat treatment of melt-grown alumina ceramics with trace glass fabricated by laser directed energy deposition

Zhao, Dake1,2; Wu, Dongjiang1; Niu, Fangyong1; Huang, Yunfei1; Ma, Guangyi1; Zhou, Cong3; Zhang, Bi3; Ren, Guanhui4,5

2023-02-01

10.1016/j.matchar.2022.112639

MATERIALS CHARACTERIZATION   Impact Factor & Quartile

1044-5803

1873-4189

Laser directed energy deposition (LDED) is attractive for one-step additive manufacturing of melt-grown alumina-based ceramics for hot-end components. However, significant improvement of mechanical properties for this material remains a challenge. Here, the macro features, microstructure, and mechanical properties in response to heat treatment temperature are investigated, especially mullite formation, crack-healing, and strength recovery. The results showed that the material has good thermal stability with mass loss <= 0.3% at high temperatures. The dissolution of alumina into the glass and the formation of mullite near the alumina-glass interface during heat treatment are responsible for the decrease in alumina grain size. With the increase of heat treatment temperature, the strength first increased and then decreased, with a maximum increase to 504.38 MPa. The fracture toughness gradually increased to a maximum of 3.54 MPa center dot m1/2. Defect repair (e.g., crackhealing) and residual stress relaxation are responsible for significantly increased sample strength.

Additive manufacturing Alumina Mullite formation Cracking-healing Strength recovery

SCI

English

Others

National Natural Science Foundation of China["51805070","51790172"] ; Natural Science Foundation of Liaoning Province["2019-ZD-0010","2020-BS-057"] ; Fundamental Research Funds for the Central Universities[DUT19RC (3) 060] ; Shenzhen Science and Technology Innovation Commission[JSGG20210420091802007]

Materials Science ; Metallurgy & Metallurgical Engineering

Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Materials Science, Characterization & Testing

WOS:000925135300001

ELSEVIER SCIENCE INC

MATERIALS SCIENCE

Web of Science

1.Dalian Univ Technol, Key Lab Precis & Nontradit Machining Technol, Minist Educ, Dalian 116000, Peoples R China
2.Guangdong Acad Sci, Inst Intelligent Mfg, Guangzhou 510070, Peoples R China
3.Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen 518055, Peoples R China
4.Shenzhen Xinjinquan Precis Techonol Co Ltd, Res & Dev Dept, Shenzhen 518055, Peoples R China
5.Shandong Univ, Sch Mech Engn, Jinan 250061, Peoples R China

Zhao, Dake,Wu, Dongjiang,Niu, Fangyong,et al. Heat treatment of melt-grown alumina ceramics with trace glass fabricated by laser directed energy deposition[J]. MATERIALS CHARACTERIZATION,2023,196.

Zhao, Dake.,Wu, Dongjiang.,Niu, Fangyong.,Huang, Yunfei.,Ma, Guangyi.,...&Ren, Guanhui.(2023).Heat treatment of melt-grown alumina ceramics with trace glass fabricated by laser directed energy deposition.MATERIALS CHARACTERIZATION,196.

Zhao, Dake,et al."Heat treatment of melt-grown alumina ceramics with trace glass fabricated by laser directed energy deposition".MATERIALS CHARACTERIZATION 196(2023).