磨球的耐磨性与自身硬度和磨料硬度有关；
The wearability of mill balls is connected with hardness of the balls and abrasive.
氢氧化铝比重2.4莫氏硬度3。比磨料加得更多的填充物。有衰退趋势，但耐磨性好。将抛光对偶。
Aluminum Oxide Specific gravity 2.4 Moh hardness 3. More a filler than an abrasive. Tends to fade, but has good wear resistance. Will polish the opposing surface.
砂轮的主要特征包括磨料、粒度、硬度、组织个结合剂五个因素。
The main characteristics of abrasive wheels include five factors, namely abrasive material, grain size, hardness, structure and bond type.
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