Abandon a cold machine . after six spins , the machine has paid out very little , abandon it 任何機器如若連續(xù)六次不出回報,放棄它?另尋一臺,以免深陷。
5 . after high temperature annealing the hardness of the composites did not reduced obviously until 973k , this temperature greatly exceeds that of pure copper ( after cold machining , the temperature is 423k ) 本文制備的材料經(jīng)高溫退火后的硬度明顯降低溫度點為973k ,大大超過了純銅(冷加工態(tài))的423k ,而且熱穩(wěn)定性能較好。
S . the composite prepared has excellent heat stability and high - temperature property . during the course of high temperature annealing , the hardness of the composite does not reduce obviously until 973k , while the temperature of pure copper ( after cold machining ) is 423k in the same conditions 制備的cr _ 2o _ 3 cu復(fù)合材料具有良好的熱穩(wěn)定性及高溫性能,在高溫退火處理過程中,硬度顯著降低點的溫度為973k ,大大高于純銅的硬度降低點。