Microstructure and Properties of SPS Sintered(Mg,Zn)Al2O4 Transparent Ceramics
Spinel transparent ceramics is a kind of transparent material widely used.Spark plasma sintering was used to produce the(Mg1-xZnx)A12O4 transparent ceramics,and the effects of Zn2+content on microstructure,densification,light transmission,and hardness were researched.In(Mg1-xZnx)Al2O4 transparent ceramics,the density of the material does not vary significantly with the addition of Zn2+,remaining at roughly 99.31％at x=0.8.Zn2+has a significant effect on the optical transmittance of ceramics.At x=0.8,the ceramics has rates of transmission that are greater than 80％in the 620-6 220 nm wavelength range.The beginning attenuation wavelength of the ceramic infrared is redshifted.Transparent ceramics made of(Mg,Zn)Al2O4 has a higher overall hardness than MgAl2O4.The hardness increases to(13.53±0.24)GPa at x=0.8,which is nearly 9％greater than the hardness of MgAl2O4.Transparent ceramics made of(Mg,Zn)Al2O4 gradually decrease fracture toughness as Zn2+is added.The addition of Zn2+ions can improve the transparency and hardness of MgAl2O4 spinel transparent ceramics.
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