【摘要】 采用尿素与硼酸的反应,在850℃氮气氛下,合成了纳米BN包裹的AlN粉料,通过TEM观察,BN粒径为20~30nm．通过热压烧结制备出纳米h-BN包裹的AlN／BN复相陶瓷,SEM／TEM观察,h-BN呈细针状,针长100~400nm,针宽为30-50nm．当h-BN含量≥20wt％时,其硬度显著降低,提高了材料的可加工性能．更多还原

【Abstract】 The AlN/h-BN nanocomposite powders were prepared through the reaction of A1N powder, H3BO3, and CO(NH2)2 in nitrogen atmosphere at 850 ℃. TEM observation shows that the average particle diameter of BN is about 20~30nm. The A1N/BN ceramic composites were synthesized by hot-pressing. SEM/TEM observation shows that the BN particles are thin pin-shaped with 100~400nm pin-length and 30~50nm pin-width. The hardness of the composites decreases obviously and the machinable property increases when the BN content is more than 20wt%.更多还原