Effect of Process Conditions on the Synthesis of TiB2/TiC Nanocomposite Powders by Mechanical Alloying

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

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 TiB2/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.