利用铝热还原金属铬炉渣制备彩色氧化锆陶瓷

doi:10.11962/1006-4990.2020-0267

Abstract

Abstract:

Colored zirconia ceramics were prepared by pressureless sintering at 1 400 ℃ for 2 h with yttrium stabilized zirco-nia（3Y-TZP） as substrate and slag from aluminothermic reduction（alumina-chrome slag,mass fraction of 5%~15%) as additive in order to improve the performance of ZrO₂ ceramics.The phase,microstructure and mechanical properties of samples were characterized by XRD,SEM,microhardness tester and universal material testing machine,respectively.It is demonstrated that the pink ZrO₂ composite ceramics can be prepared with alumina-chrome slag additive,which consists of tetragonal ZrO₂,monoclinal ZrO₂ and（Cr-doped）-Al₂O₃.Moreover,the addition of alumina-chrome slag promotes more tetra-gonal ZrO₂ to be retained at room temperature.The addition of alumina-chrome slag hindered the sintering compactness of samples.The sintering volume shrinkage rate of ZrO₂ composite ceramics was decreased by increasing the content of alumina-chrome slag and pores were observed in the substrate.However,the mechanical properties of composite ceramics was impro-ved by addition of aluminachrome slag.When the content of alumina-chrome slag was 5%,the microhardness and flexural strength of ZrO₂ ceramics reached the maximum value of 1 755.3 HV and 421.3 MPa,respectively.

Key words: colore zirconia ceramics, aluminothermic reduction, slag, ceramic toughening, mechanical properties

CLC Number:

TQ174

Liu Yuhong,Yin Chunlin,Ma Shunyou,Yan Xin,Yuan Xiaochao,Leng Jianjun,Zhang Jin. Preparation of colored zirconia ceramics by adding alumina-chrome slag from aluminothermic reduction[J]. Inorganic Chemicals Industry, 2021, 53(3): 78-83.

Figures/Tables 6

References 36

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Preparation of colored zirconia ceramics by adding alumina-chrome slag from aluminothermic reduction

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