probe needle造句

• By the methods of epn ( electronic probing needle ) 、 sem and xed , the formation mechanisms of the wear - resistant composite layer are studied , the results indicated that , molten iron has infiltrated into the alloying layer under capillary action . this caused ht powder , whose fusion point is low relatively , to be surperheated and formed a surface composite layer
  利用电子显微镜及x射线衍射等试验方法，研究了复合层形成机理，研究表明，复合层是在毛细力作用下，铁液被吸入合金层中，致使低熔点ht粉过热熔化而形成的，并与母材是冶金结合。