ZrO_2添加量对ZTA陶瓷力学性能及冲蚀磨损行为的影响

Effect of ZrO_2 Addition on Mechanical and Erosive Wear Properties of ZTA Ceramic

以α-Al2O3、ZrO(NO3)2.2H2O和氨水为原料,通过高温煅烧制备了ZTA复相陶瓷材料,研究了ZrO2添加量对ZTA陶瓷物相组成、表面微观形貌、力学性能以及常温固体粒子冲蚀磨损性能的影响。结果表明:随着ZrO2添加量增加,材料的力学性能逐渐提高,当ZrO2添加量为10 vol%时,ZTA复相陶瓷抗弯强度和断裂韧性分别达461MPa和5.77 MPa.m1/2,相对于纯Al2O3陶瓷提升量达21.3%和64.9%。ZTA复相陶瓷材料的体积冲蚀率随着ZrO2添加量的增加而降低,当ZrO2添加量小于4 vol%时,其体积磨损率急剧下降,随后趋于平稳;随后当ZrO2添加量为10 vol%时,其冲蚀率达最低,为0.015 mm3/g。其中,纯Al2O3陶瓷材料的冲蚀磨损机制主要为横向裂纹相互交错导致材料的剥落,添加ZrO2后,其冲蚀磨损机制以塑性变形为主。

ZTA composites were synthesized by high temperature calcination, using a-A12 03, ZrO （ NO3 ） 2· 2H20 and ammonia as the main raw material. The effect of ZrO2 additions on the phase composition, microstructures, mechanical properties and erosion-corrosion properties were studied in this work. The results showed that the mechanical properties improved when the content of ZrO2 increased. The flexural strength and the fracture toughness with 10 vol% added could increase by 21.3% and 64.9%, and reach the maximum of 461 MPa and 5.77 MPa. m1/2, respectively. The volume erosion rate decreased with the increasing of ZrO2, when the addition of ZrO2 is less than 4 vol%, the volume erosion rate dropped rapidly, and then tended towards stability. When the addition of ZrO2 reached 10 vol%, the volume erosion rate reached 0.015 mm3/g. The erosion mechanism of pure A1203 was transverse cracks intersecting which resulted in flaking of the material, and the erosion mechanism turned out to be plastic deformation with the ZrO2 added.