pre-alloyed powder

例句：

1. 1.The pre-alloyed powder was used as a catalyst in the chemical reaction.
   预合金粉作为催化剂用于化学反应。
2. 2.The pre-alloyed powder was mixed with oil to form a paste.
   预合金粉与油混合形成糊状物。
3. 3.The pre-alloyed powder was then heated and compacted into a pellet.
   预合金粉随后被加热并压缩成球状。