论文部分内容阅读
以纳米V_2O_5、纳米Cr_2O_3和纳米碳黑为原料,经过干燥、球磨混料后,在流动氮气中焙烧,得到了氮化钒/氮化铬(VN/CrN)复合粉末。利用XRD、TG-DSC、SEM、BET和TEM对合成产物进行了表征和测试,考察了反应温度和保温时间对VN/CrN复合粉末的微观结构和性能的影响。结果表明:在1 200℃、保温2 h条件下,可制备出平均晶粒直径为40 nm的VN/CrN复合粉末。该复合粉末主要由VN、CrN和VCrN_2组成,这3种物质均为面心立方结构,空间群均属于Fm3m。复合粉末的比表面积为21.09 m~2/g。将复合粉末作为添加剂加入到陶瓷磨具结合剂中进行性能测试,结果显示:当w(复合粉末)=0.2%时,陶瓷磨具结合剂抗折强度和流动性分别提高约20%和50%;当w(复合粉末)=1.0%时,其抗折强度和流动性均达到最大值115.6 MPa和207.2%。
The nano-V_2O_5, nano-Cr_2O_3 and nano-carbon black were used as raw materials. After drying and ball milling, the mixture was calcined in flowing nitrogen to obtain VN / CrN composite powder. The synthesized products were characterized and tested by XRD, TG-DSC, SEM, BET and TEM. The effects of reaction temperature and holding time on the microstructure and properties of VN / CrN composite powders were investigated. The results show that the VN / CrN composite powders with the average grain diameter of 40 nm can be prepared under the conditions of 1 200 ℃ and 2 h incubation. The composite powder is mainly composed of VN, CrN and VCrN 2, all of which are face-centered cubic structures and all the space groups belong to Fm 3m. The specific surface area of composite powder is 21.09 m ~ 2 / g. The composite powder as an additive to the ceramic abrasive binder for performance testing, the results show that: when w (composite powder) = 0.2%, the ceramic abrasive bond strength and fluidity increased by about 20% and 50% ; When w (composite powder) = 1.0%, its flexural strength and fluidity reached the maximum 115.6 MPa and 207.2%.