利用离心沉降分光光度法对 SiC 晶须在4种不同分散剂中的分散行为进行了研究,探讨了不同分散剂的分散效果,并对其分散机理进行了分析。结果表明,分散剂的分散能力顺序为焦磷酸钠>六偏磷酸钠>吐温80>聚乙二醇;不同类型分散剂混...利用离心沉降分光光度法对 SiC 晶须在4种不同分散剂中的分散行为进行了研究,探讨了不同分散剂的分散效果,并对其分散机理进行了分析。结果表明,分散剂的分散能力顺序为焦磷酸钠>六偏磷酸钠>吐温80>聚乙二醇;不同类型分散剂混合使用的分散效果要比使用1种分散剂的好。展开更多
By using self-made metal-alkoxide yttrium isopropoxide as a sintering additive and disperser of whisker, the SiC whisker reinforced AIN ceramics was prepared. Its apparent density is 99.5 percent of the theoretical de...By using self-made metal-alkoxide yttrium isopropoxide as a sintering additive and disperser of whisker, the SiC whisker reinforced AIN ceramics was prepared. Its apparent density is 99.5 percent of the theoretical density; its flexural strength and fracture toughness are 681 MPa and 5.21 MPa·m1/2 respectively. Comparing the result with that by applying Y2O3 powder as a sintering additive, the flexural strength is increased by 25% and the fracture toughness is increased by 33% . The dispersity of whisker by increased yttrium isopropoxide is significantly better than that by Triton X-100.展开更多
本工作用四种分敏方法,对 SiC(w)/Al_2O_3复合材料体系(AS)进行分散,用 SEM 和 TEM 观察了不同分散条件下的晶须分散效果.通过测定不同分散条件下 AS 材料的力学性能和烧结密度,讨论了分散工艺对力学性能的影响.为了表征 SiC 晶须在不...本工作用四种分敏方法,对 SiC(w)/Al_2O_3复合材料体系(AS)进行分散,用 SEM 和 TEM 观察了不同分散条件下的晶须分散效果.通过测定不同分散条件下 AS 材料的力学性能和烧结密度,讨论了分散工艺对力学性能的影响.为了表征 SiC 晶须在不同分散介质条件下的分散特征,主要选用沉积密度作为表征参数来比较晶须的分散特性.实验结果表明,用酒精作为分散介质,金属醇盐作为分散剂,SiC 晶须的沉积密度达24%,在此条件下进行复合体系的分散混合,能达到 SiC 晶须在基体中均匀分布,材料力学性能随之有明显改进,抗弯强度达850MPa,K_(1c)为8.1MPa·m^1/2.SEM 和 TEM 的分析显示:AS 材料的增韧机制主要是界面解离和裂纹偏转;在本工作条件下,SiC 晶须的团聚对材料的抗弯强度的影响尤为显著,但对断裂韧性的影响较小.展开更多
文摘By using self-made metal-alkoxide yttrium isopropoxide as a sintering additive and disperser of whisker, the SiC whisker reinforced AIN ceramics was prepared. Its apparent density is 99.5 percent of the theoretical density; its flexural strength and fracture toughness are 681 MPa and 5.21 MPa·m1/2 respectively. Comparing the result with that by applying Y2O3 powder as a sintering additive, the flexural strength is increased by 25% and the fracture toughness is increased by 33% . The dispersity of whisker by increased yttrium isopropoxide is significantly better than that by Triton X-100.
文摘本工作用四种分敏方法,对 SiC(w)/Al_2O_3复合材料体系(AS)进行分散,用 SEM 和 TEM 观察了不同分散条件下的晶须分散效果.通过测定不同分散条件下 AS 材料的力学性能和烧结密度,讨论了分散工艺对力学性能的影响.为了表征 SiC 晶须在不同分散介质条件下的分散特征,主要选用沉积密度作为表征参数来比较晶须的分散特性.实验结果表明,用酒精作为分散介质,金属醇盐作为分散剂,SiC 晶须的沉积密度达24%,在此条件下进行复合体系的分散混合,能达到 SiC 晶须在基体中均匀分布,材料力学性能随之有明显改进,抗弯强度达850MPa,K_(1c)为8.1MPa·m^1/2.SEM 和 TEM 的分析显示:AS 材料的增韧机制主要是界面解离和裂纹偏转;在本工作条件下,SiC 晶须的团聚对材料的抗弯强度的影响尤为显著,但对断裂韧性的影响较小.
