Calamitous accidents , by its paroxysm and cruelty , always are the focus that the society pays close attention to for its enormous shock strength and influence 灾难性突发事件，以其“突发性”和“残酷性” ，成为社会关注的热点和焦点，有着巨大的震撼力和影响力。
2.
Possessing some unique features as high tensile strength , shock strength and bending strength , they are widely used in cutting various metals or nonmetal materials , thus achieving fast and economical results 具有较高的抗拉抗冲击和抗弯强度，广泛用于各种金属与非金属材料的切割和生产下料，既迅速又经济。
3.
The products are made of selected high quality abrasi - ves and synthetic resin rein - forcing by special fabrics , possessing some unique features high tensile strength , shock strength and bending strenth . they are widely used in cutting various metal or nonmetal materials . thus achieving fast and economical results 本产品是用特殊纤维织物作增强材料的一种树脂磨具，具有较高的抗拉、抗冲击和抗弯强度，广泛应用于对各种金属与非金属材料的切割和生产下料。
4.
The studies indicate that different content of pyrophyllite and dolomite can cause the following three cases : ( 1 ) making the refractory point decrease linearly and , to some extent , influencing the microstructure and properties of sintered body ; ( 2 ) acceleratingmullite formation during sintering , reducing thermal expansion coefficient of bond , reinforcing the matching nature and improving the flexural strength and shock strength ; ( 3 ) preventing sic grinding tool from generating black core , expanding suitable sintering temperature range of sic grinding tool 同时，也不同程度地影响了磨具烧结体的微观结构和性能； ( 2 )可促进在烧结过程中莫来石的形成，降低结合剂的热膨胀系数，加强了结合剂与磨料的匹配性，提高了磨具的抗折强度和抗冲击强度； ( 3 )在一定温度范围内还可防止碳化硅磨具出现黑心现象，拓宽了碳化硅磨具的烧结温度适应范围。
5.
Experiments show the optimum content of pyrophyllite and dolomite is 30 % ; in contrast to original bond , the refractory point of bond is reduced by 55 , the average coefficient of thermal expansion is reduced by 30 % and flexural strength and shock strength of grinding tool are increased by 27 % and 22 % respectively 通过实验发现：叶蜡石和白云石最佳含量为30 % ，与原结合剂相比，结合剂耐火度降低了55 ，平均热膨胀系数降低了30 % ，磨具抗折强度提高了27 % ，磨具抗冲击强度提高了22 % 。
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