کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1464587 | 989665 | 2006 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Mechanical and tribological properties of hot-pressed h-BN/Si3N4 ceramic composites Mechanical and tribological properties of hot-pressed h-BN/Si3N4 ceramic composites](/preview/png/1464587.png)
h-BN/Si3N4 ceramic composites were fabricated by hot-pressing using sub-micrometer sized α-Si3N4, h-BN powders and Y2O3–Al2O3 sintering additives. The microstructural analysis indicated the growth of β-Si3N4 grains to be hindered by h-BN particles and the diameter and aspect ratio of elongated β-Si3N4 grains to decrease with increasing h-BN content. As expected, this increase of h-BN content resulted in a slight decrease in the bending strength and fracture toughness and a sharp decrease in the elastic modulus and Vickers hardness of h-BN/Si3N4 ceramic composites. In addition, the friction coefficient of the h-BN/Si3N4 ceramic composites decreased with increasing h-BN content. A spalling mode of failure has been observed on the worn surface of monolithic Si3N4 and 10 vol.%h-BN/Si3N4 ceramic composite.
Journal: Ceramics International - Volume 32, Issue 5, 2006, Pages 549–554