How to identify black silicon carbide

Black silicon carbide as chemical stability, high thermal conductivity , thermal expansion coefficient, good wear resistance , except for the abrasive used , there are many other uses , for example: a special process the silicon carbide powder coating on the turbine impeller or cylinder block the wall, can improve the wear resistance and extended service life 1 to 2 times ; made ??of high-grade refractory to , thermal shock resistance , small size, light in weight , high strength, good energy saving effect .
How do black silicon carbide identification:
1 Appearance Density : And you want to see the density of silicon carbide , silicon carbide and high chamber generally loose content is higher than the number ;
(2) Test Hardness: It 's more than the glass hard , can use when glass cutter ;
3 see color: from the color , the difference with green silicon ;
4 experiment : to find a glass container , put the pieces into a certain amount of silicon carbide , add water , shake , look at its turbidity , water darker , indicating its higher carbon , silicon carbide, but less ; the water drained , look silicon carbide in the quartz sand how many unfired raw numbers , then make a preliminary judgment, if you engage in over- testing, your judgment will not be up and down the error 3 .