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        如何鑒別開關質量
        
        
        
    
            
        
        
        
            
            
        
                
        
                    
        如何鑒別開關質量
        更新時間:2017/6/8
        一、觸點
        所謂觸點，就是開關過程中導電零件的接觸點。一要看觸點的大小，一般是越大越好。二要看材質，目前觸點的材質主要有三種：銀鎳合金、銀鎘合金和純銀。
        銀鎳合金是目前比較理想的觸點材料，導電性能、硬度比較好，也不容易氧化生銹。
        銀鎘合金觸點其他方面也都比較好，但就是鎘元素屬于重金屬，一方面對人體有害，另一方面和銀的融合性也不太理想，會在觸點表面形成鎘金屬小顆粒，導電時可能拉出電弧。
        純銀做觸點其實并不合適，導電性能的確不錯，但純銀質地比較軟、還很容易氧化（像銀首飾時間一長就會變黑）。質地軟，開關多了觸點就變形了；氧化生銹的話導電性能會差很多，銹點還容易發(fā)熱，很容易就把觸點燒化了。
        二、彈片
            彈片是開關插座的關鍵部件，主要用料是銅，主要有黃銅、紫銅等。黃銅容易生銹，質地偏軟，時間一長接觸、導電性能都會下降。如果銅片顏色是紫紅色就比較好，紫銅比較韌，不容易生銹。直接看還不行，一般還要拆開看。很多插座都是插孔這里用紫銅，里面都用黃銅，同樣容易生銹。即使都用紫銅，也有高下之分。國產紫銅不太純，上面會有些黑色的銹點，這些銹點都是通電時的發(fā)熱源。而一些好的品牌會采用進口的銅才，很光亮、細節(jié)，導電性能明顯要好。
        
                
        
            
        
        
        
    
            
        
        
        
            
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