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

摘要/Abstract

摘要：

为提升氧化锆陶瓷的使用性能,采用氧化钇稳定的四方氧化锆为基体（yttria stabilized tetragonal zirconia,3Y-TZP）,将铝热法生产金属铬所得炉渣（铝铬渣）按照不同比例（质量分数为5%~15%）加入,利用无压烧结在1 400 ℃保温2 h制备出彩色氧化锆陶瓷。通过X射线衍射（XRD）、扫描电镜（SEM）、显微硬度计及万能材料试验机测试了试样的物相、显微结构及力学性能。结果表明：掺杂铝铬渣可以制备出粉红色系氧化锆复合陶瓷,其物相主要为四方氧化锆、单斜氧化锆和含铬的氧化铝,并且铝铬渣的加入促使更多的四方氧化锆保留到室温。铝铬渣的加入不利于试样的烧结致密性,随着其含量增加复合陶瓷烧结后的体积收缩率降低,基体内出现部分孔隙。但是,铝铬渣的加入提升了试样的力学性能,当其加入量为5%（质量分数）时,氧化锆复合陶瓷的显微硬度和抗折强度均达到最大值,分别为1 755.3 HV和421.3 MPa。

关键词: 彩色氧化锆陶瓷, 铝热还原, 炉渣, 陶瓷增韧, 力学性能

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

中图分类号:

TQ174

刘玉洪,尹春林,马顺友,颜欣,袁小超,冷建军,张进. 利用铝热还原金属铬炉渣制备彩色氧化锆陶瓷[J]. 无机盐工业, 2021, 53(3): 78-83.

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.

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