利用铝热还原金属铬炉渣制备彩色氧化锆陶瓷
收稿日期: 2020-09-15
网络出版日期: 2021-03-11
基金资助
四川省科技厅重点研发计划项目(21ZDYF4018);油气田材料四川省高校重点实验室基金(X151519KCL21)
Preparation of colored zirconia ceramics by adding alumina-chrome slag from aluminothermic reduction
Received date: 2020-09-15
Online published: 2021-03-11
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。
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 . DOI: 10.11962/1006-4990.2020-0267
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.
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