T8涂层中由于碳元素被大量烧损，导致涂层氧化严重，孔隙率高，这是造成涂层硬度和强度不高及耐磨性较差的主要原因。
The burning loss of carbon, which causes heavy oxidation and high porosity, is the main reason for lower hardness, strength and worse wear resistance of T8 coating.
本模具是一个辊筒的注塑模具，制件尺寸较大、形状较为复杂，硬度高，但精度要求不高。
This is a injection mould to produce roller. the roller is big , complicated and the rigidity high , but the accuracy is not request high .
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