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Rapid and uniform in-situ solidification of alumina suspension via a non-contamination DCC-HVCI method using MgO sintering additive as coagulating agent
Affiliation:1. State Key Laboratory of Material Processing and Die & Mould Technology, School of Material Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;2. Research Institute of Huazhong University of Science and Technology in Shenzhen, Shenzhen 518057, China;3. State Key Lab of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;1. State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China;2. Research Institute of Huazhong University of Science and Technology in Shenzhen, Shenzhen 518057, PR China;1. Department of Dental Laboratory Science and Engineering, Korea University, Seoul 136-703, Republic of Korea;2. Department of Orthopaedics, Korea University Medical Center, Guro Hospital, Seoul 152-703, Republic of Korea;3. Department of Materials Science and Engineering, Seoul National University, Seoul 151-742, Republic of Korea;1. Politecnico di Torino, Department of Applied Science and Technology, INSTM R.U. Lince Laboratory, Corso Duca Degli Abruzzi, 24, Italy;2. LSFC Laboratoire de Synthèse et Fonctionnalisation des céramiques UMR 3080 CNRS / SAINT-GOBAIN CREE, SAINT-GOBAIN RESEARCH PROVENCE, 550 Avenue Alphonse Jauffret, Cavaillon, France;1. School of Materials Science and Engineering, Yeungnam University, Gyeongsan, 38541, Republic of Korea;2. Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology, Icheon, 17303, Republic of Korea;1. State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China;3. School of Materials Science and Engineering, Shanghai University, 99 Shangda Road, Shanghai 200444, China
Abstract:A novel rapid, uniform and non-contamination in-situ solidification method for alumina suspension by DCC-HVCI method using MgO sintering additive as coagulating agent was reported. MgO was used to release Mg2+ in suspensions via reaction with acetic acid generated from glycerol diacetate (GDA) at elevated temperature as well as to improve density and suppress grain growth of alumina ceramics during sintering. Influence of adding 0.7 wt% MgO with 2.0 vol% GDA in alumina suspension on coagulation process and properties of green bodies and sintered samples were investigated. It was indicated that the controlled coagulation of the suspension could be achieved after treating at 70 °C for 10 min. Homogeneous composition distribution of Mg element in EDS result indicated the uniform solidification of suspensions. Compressive strength of wet-coagulated bodies is 2.09±0.25 MPa. Dense alumina ceramics with relative density of 99.2% and flexural strength of 354±16 MPa sintered at 1650 °C for 4 h present homogeneous microstructure. The result indicated that the novel DCC-HVCI method via a sintering additive reaction with no contamination, short coagulation time and uniform in-situ solidification is a promising colloidal forming method for preparing high-performance ceramic components with complex shape.
Keywords:Direct coagulation casting  High valence counter ions  MgO  Sintering additive  Glycerol diacetate  Mechanical properties
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