基于空心氧化铝微球造孔的陶瓷结合剂金刚石砂轮

轩闯; 王超超; 白福厚; 张凤林

doi:10.13394/j.cnki.jgszz.2021.4001

基于空心氧化铝微球造孔的陶瓷结合剂金刚石砂轮

doi: 10.13394/j.cnki.jgszz.2021.4001

广东工业大学机电工程学院，广州 510006

基金项目: 广东省“珠江人才计划”本土创新科研团队项目（2017BT01C169）；佛山市核心技术攻关项目（1920001000361）。

详细信息

作者简介:
轩闯：

通讯作者:
张凤林，男，1972年生，博士、教授。主要研究方向：难加工材料的磨削加工以及超硬材料制品。E-mail：zhangfl@gdut.edu.cn

中图分类号: TG74+3；TQ164
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出版历程
- 收稿日期: 2022-01-16
- 修回日期: 2022-03-24
- 录用日期: 2022-03-25
- 刊出日期: 2022-08-16

Vitrified bond diamond grinding wheel based on hollow corundum microspheres

School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China

摘要

摘要: 研究空心氧化铝微球质量分数和粒径（0.2, 0.4, 0.6 mm）对砂轮的总气孔率、抗弯强度、硬度和微观结构的影响，制备以空心氧化铝微球为造孔剂的陶瓷结合剂金刚石砂轮，并研究砂轮对石英玻璃的磨削性能。结果表明：随着空心氧化铝微球质量分数增加，砂轮总气孔率升高，抗弯强度和硬度降低；空心氧化铝微球质量分数相同时，其粒径越小，砂轮的总气孔率越高，抗弯强度和硬度越低；制备的空心氧化铝微球陶瓷结合剂金刚石砂轮可用于磨削石英玻璃，加工后石英玻璃的表面粗糙度从0.5113 μm降至0.0206 μm。
- 空心氧化铝微球 /
- 陶瓷结合剂 /
- 金刚石砂轮 /
- 总气孔率 /
- 力学性能 /
- 磨削性能
Abstract: The effect of the content and the size (0.2, 0.4, 0.6 mm) of the hollow corundum microspheres on the total porosity, the flexural strength, the hardness and the microstructure of vitrified bond was investigated. The ceramic bonded diamond grinding wheel with hollow alumina microspheres as pore forming agent was prepared, and the grinding performance of the grinding wheel on quartz glass was studied. The results show that with the increase of the content of hollow corundum microspheres, the porosity increases, and the flexural strength and the hardness decreases at the same time. With the same content of hollow corundum microspheres, addition the smaller size of microspheres could lead to the increase of the porosity and the decrease of flexural and hardness. The vitrified bond diamond wheel contained with hollow corundum microspheres can used to grind quartz glass, and the surface roughness can be reduced from 0.5113 μm to 0.0206 μm. Diamond wheel contained with hollow corundum microspheres can used to grind quartz glass, and the surface roughness can be reduced from 0.5113 μm to 0.0206 μm.
- hollow corundum microspheres /
- vitrified bond /
- diamond grinding wheel /
- total porosity /
- mechanical properties /
- grinding performance

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图 1 空心氧化铝微球的微观形貌

Figure 1. Microstructure of hollow Al2O3 bubble

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图 2 砂轮长条试样

Figure 2. Sintered specimen

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图 3 陶瓷结合剂金刚石砂轮

Figure 3. Ceramic bonded diamond grinding wheel

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图 4 空心氧化铝微球质量分数对砂轮试样总气孔率的影响

Figure 4. Influence of mass fraction of hollow Al₂O₃ microsphere on the total porosity of grinding wheel specimens

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图 5 空心氧化铝微球质量分数对砂轮试样抗弯强度的影响

Figure 5. Influence of mass fraction of hollow Al₂O₃ microsphere on the flexural strength of grinding wheel specimens

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图 6 空心氧化铝微球质量分数对砂轮试样硬度的影响

Figure 6. Influence of mass fraction of hollow Al₂O₃ microsphere on the hardness of grinding wheel specimens

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图 7 空心氧化铝微球砂轮试样的断面微观结构形貌

Figure 7. SEM images of fracture surface of the grinding wheel specimens with hollow Al₂O₃ microsphere

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图 8 砂轮修整前后表面微观形貌

Figure 8. Optical image of diamond grinding wheel before dressing and after dressing

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图 9 磨削加工中空心氧化铝微球作用机理示意图

Figure 9. Schematic illustration of the function of hollow Al₂O₃ microspheres in grinding process

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图 10 石英玻璃磨削前后的表面微观形貌

Figure 10. Surface morphology of quartz glass before grinding and after grinding

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图 11 石英玻璃磨削前后三维形貌

Figure 11. Three-dimensional morphology of quartz glass before grinding and after grinding

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图 12 陶瓷结合剂金刚石砂轮磨削前后表面微观形貌

Figure 12. Microstructure of the surface of the vitrified bond diamond grinding wheel before grinding and after grinding

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表 1 金刚石砂轮常用造孔剂及性能

Table 1. Common pore forming additives and their performance for diamond grinding wheels

类型	造孔剂名称	平均粒径 d / μm	造孔效果
溶解型^[10]	CaO、Zn、SiO₂	5～45	受溶剂影响较大
加热碳化或分解	粉煤灰微球^[11]	105～235	类球形气孔，含量较高时易产生裂纹
	砂糖颗粒^[12]	100～500	不规则形气孔，含量较低时分布较均匀
	石墨颗粒^[13]	250～300	大小不一，不规则形气孔
	CaCO₃^[13]	60～180	分布均匀，类球形气孔
	核桃壳粉^[14]	180	分布不均匀，不规则形气孔
	精萘^[14]	120	分布均匀，类球形气孔
空心微球	空心玻璃微球^[15]	40, 80	尺寸相近，分布均匀，类球形气孔
空心微球	空心氧化铝微球^[16]	125, 250	尺寸相近，分布均匀，类球形气孔

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表 2 不同质量分数的空心氧化铝微球砂轮配方

Table 2. Formula and the preparation parameters of grinding wheel specimens with different mass fraction of hollow Al₂O₃ microsphere

金刚石质量分数 ω_d / %	结合剂质量分数 ω_c / %	空心氧化铝微球质量分数 ω_a / %	烧结温度 θ / ℃	保温时间 t / h	成形密度 ρ / (g·cm⁻³)
64.99	32.01	3.00	670	1.0	2.0
62.98	31.02	6.00	670	1.0	2.0
60.97	30.03	9.00	670	1.0	2.0
58.96	29.04	12.00	670	1.0	2.0

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