Abstract Core-shell structure (FA@SiO2) pore former is employed to fabricate high porosity and low mechanical behavior loss vitrified bond diamond abrasive tools. Four different pore former contents i.e. 2, 4, 6, and 8 wt% are used to fabricate the composites. The effects of content of the FA/FA@SiO2 on the phase, morphology structure, open porosity, fracture strength, as well as Rockwell hardness of the FA/FA@SiO2 pore former in the composite are investigated. With increasing FA/FA@SiO2 content from 0 to 8 wt%, open porosity of the composites increases significantly and fracture strength drops ~15%. As compared with FA composite, FA@SiO2 composite exhibits improved pore structures, thus suppressing dramatically bending strength loss and grade loss while remains high porosity. Moreover, the FA@SiO2 in the matrix facilitates the enhancement of interfacial debonding owing to the high contact area, supported SiO2 interlayer and processes of early crack capture at FA@SiO2/glass matrix interface. Therefore, the 4 wt% FA@SiO2 composite shows superior bending strength and hardness (65.08 MPa; 46.25 HRB), which are 15% and 37% higher than those of 4 wt% FA composites (56.33 MPa; 33.67 HRB).

中文翻译：

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粉煤灰煤胞@SiO2核壳微球对陶瓷结合剂金刚石工具物理性能和微观结构的影响

摘要 采用核壳结构（FA@SiO2）成孔剂制备高孔隙率、低机械性能损失的陶瓷结合剂金刚石磨具。四种不同的成孔剂含量，即 2、4、6 和 8 重量％用于制造复合材料。研究了 FA/FA@SiO2 的含量对复合材料中 FA/FA@SiO2 造孔剂的相、形貌结构、开孔率、断裂强度以及洛氏硬度的影响。随着 FA/FA@SiO2 含量从 0% 增加到 8%，复合材料的开孔率显着增加，断裂强度下降约 15%。与 FA 复合材料相比，FA@SiO2 复合材料表现出改进的孔隙结构，从而在保持高孔隙率的同时显着抑制了弯曲强度损失和等级损失。而且，由于高接触面积、支持的 SiO2 夹层和 FA@SiO2/玻璃基体界面处的早期裂纹捕获过程，基体中的 FA@SiO2 促进了界面剥离。因此，4 wt% FA@SiO2 复合材料显示出优异的弯曲强度和硬度（65.08 MPa；46.25 HRB），比 4 wt% FA 复合材料（56.33 MPa；33.67 HRB）高 15% 和 37%。