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功能輥表面噴焊處理

日期:2022-05-13 17:04 人氣:
       噴焊工藝也是金屬表面技術之一,多用于對抗沖擊性能、耐磨、耐腐蝕性能要求比較高的工件表面。
       噴焊工藝主要是對經過預熱的自熔性合金粉末涂層再加熱到1000-1300℃,使其顆粒熔化,在工件表面生成硼化物或硅化物彌散在涂層中,然后促使顆粒與基體表面良好結合,性能組織致密的金屬涂層??捎糜趪姾腹に嚨牟牧弦埠芏?,主要是以鎳、鈷、鐵為基材的合金,其中加入適量的硼和硅元素,起脫氧造渣焊接溶劑的作用。與熱噴涂制備的金屬涂層相比,噴焊層的主要優點:
       1、孔隙率小,可達到無空隙率的狀態;
       2、涂層與基體呈現冶金結合,熱影響區相比激光來說,比較大;
       3、硬度一般在HRC40-60之間;
       4、由于其工藝特性,耐磨、耐腐蝕以及抗沖擊性能比較高。
       與熱噴涂涂層相比,噴焊層雖然有比較顯著的使用性能,但是由于重熔過程中基體局部受熱溫度要達到900℃,會產生較大的熱變形,因此,噴焊的使用范圍還是有一定的局限性的。
功能輥表面噴焊處理

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