【摘要】 采用机械合金化的方法利用工业纯Ti粉和B4C粉末合成了TiB₂/TiC纳米复合粉末。结果表明,球磨过程中保护气氛的纯度对合金化过程有着非常重要的影响。在纯氩气保护的情况下球磨5 h,Ti和B₄C粉末发生了固相反应,形成了复合TiB₂/TiC相,随着球磨时间增加,合成的TiC相的晶粒尺寸减小至10 nm,而TiB₂晶粒尺寸略大;如果球磨过程中混入空气,合金化产物中将会出现大量的TiN和TiO。更多还原

【Abstract】 TiB₂/TiC nanocomposite powder was synthesized by ball milling the industrial grade Ti powder and B₄C powder.The results show that the milling atmosphere plays a crucial role in the synthesis of TiB/TiC.After 5 h milling under an appropriate argon protection,a solid state reaction between Ti and B₄C occurs resulting in the formation of TiB₂/TiC phases.With increasing of the milling time,the crystal size of synthesized TiC is decreased to about 10 nm while the crystal size of TiB₂ is slightly larger.When the air is introduced in the milling process,a large amount of TiN and TiO will occur in the milled product.更多还原