多孔氧化铝陶瓷的制备、表征及性能研究  

Preparation,characterization and properties of porous alumina ceramics

作　　者：陈仕军 CHEN Shi-jun(Chaozhou Third Ring(Group)Co.,Ltd.,Chaozhou 521000,China)

机构地区：[1]潮州三环(集团)股份有限公司,广东潮州521000

出　　处：《化学工程师》2022年第5期9-13,共5页Chemical Engineer

基　　金：2020年四川省重大科技专项项目“电子电力用特种陶瓷材料及元器件研发与应用示范”(No.2020ZDZX0012)成果之一。

摘　　要：以蔗糖溶液为低温介质,采用冷冻干燥法和退火工艺制备多孔Al2O3陶瓷。研究了烧结温度和退火时间对多孔陶瓷孔隙结构、开孔率和力学性能的影响。结果表明,随着烧结温度的升高,试样的线性烧成收缩率有明显的升高,开孔率和维氏硬度先缓慢降低,当烧结温度为1600℃时迅速下降。平均晶粒尺寸是影响甚至决定多孔氧化铝陶瓷维氏硬度的主要原因。随着退火时间的延长,多孔陶瓷的孔径显著增大,多孔陶瓷开孔率范围为40.35%~64.58%,退火处理后的孔隙率比未退火处理提高了60.05%。多孔陶瓷的抗压强度随退火时间的延长而降低,而在最长的24h退火时间后,多孔陶瓷的抗压强度仍能达到25.9MPa,可以满足许多应用领域的强度要求。可以通过调节退火时间来控制多孔陶瓷的孔隙结构、开孔率和抗压强度。Porous Al2O3ceramics were prepared by freeze-drying and annealing using sucrose solution as low temperature medium.The effects of sintering temperature and annealing time on the pore structure,porosity and mechanical properties of porous ceramics were studied.The results showed that with the increase of sintering temperature,the linear sintering shrinkage of the samples increases obviously,and the open porosity and Vickers hardness decrease slowly first,and then decrease rapidly when the sintering temperature is 1600℃.The average grain size is the main factor that affects or even determines the Vickers hardness of porous alumina ceramics.The pore size of porous ceramics increases significantly with the increase of annealing time.The opening rate of porous ceramics ranges from 40.35% to 64.58%,and the porosity after annealing treatment is 60.05% higher than that without annealing treatment.The compressive strength of porous ceramics decreases with the increase of annealing time,and the maximum annealing time is 24h,and the compressive strength of porous ceramics can still reach 25.9MPa,which can meet the strength requirements of many applications.The pore structure,porosity and compressive strength of porous ceramics can be controlled by adjusting the annealing time.

关 键 词：冷冻干燥法 退火工艺 多孔Al2O3陶瓷 性能研究 

分 类 号：TB333[一般工业技术—材料科学与工程]