Effect of composition and content on properties of vitrified bond

CHEN Qi; WANG Chunhua; LI Zhengxin; ZHANG Lin; ZHANG Guowei; ZHOU Shaojie; XIA Xuefeng; SHAO Junyong

doi:10.13394/j.cnki.jgszz.2023.0126

Volume 44 Issue 6

Dec. 2024

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CHEN Qi, WANG Chunhua, LI Zhengxin, ZHANG Lin, ZHANG Guowei, ZHOU Shaojie, XIA Xuefeng, SHAO Junyong. Effect of composition and content on properties of vitrified bond[J]. Diamond & Abrasives Engineering, 2024, 44(6): 761-768. doi: 10.13394/j.cnki.jgszz.2023.0126

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CHEN Qi, WANG Chunhua, LI Zhengxin, ZHANG Lin, ZHANG Guowei, ZHOU Shaojie, XIA Xuefeng, SHAO Junyong. Effect of composition and content on properties of vitrified bond[J]. Diamond & Abrasives Engineering, 2024, 44(6): 761-768. doi: 10.13394/j.cnki.jgszz.2023.0126

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Effect of composition and content on properties of vitrified bond

doi: 10.13394/j.cnki.jgszz.2023.0126

1.
School of Materials Science and Engineering, Henan University of Technology, Zhengzhou 450001, China
2.
White Dove Abrasives and Grinding Co., Ltd., Zhengzhou 450199, China
3.
SINOMACH-INT Co., Ltd., Zhengzhou 450018, China
4.
Chengdu Tool Research Institute Co., Ltd., Chengdu 610500, China

More Information

Received Date: 2023-06-09
Accepted Date: 2024-01-30
Rev Recd Date: 2024-01-08

Abstract

Abstract

Objectives: Vitrified bonded diamond grinding tools are widely used in the machining industry, but the high-temperature resistance of diamond is poor. Therefore, there are high requirements on sintering temperature, flowability, and thermal expansion coefficient of vitrified bond materials. The influence of the content of Al₂O₃, B₂O₃, and SiO₂ in vitrified bond on its properties is investigated. By changing the content of these three components and comparing the changes in the properties of the bonds, a more suitable vitrified bond for diamond grinding tools is obtained. Methods: Using a ternary phase diagram, the content of Al₂O₃, B₂O₃, and SiO₂ in the R₂O-Al₂O₃-B₂O₃-SiO₂ bond system is adjusted. Sixteen different formulas were designed to prepare 5 mm × 6 mm × 30 mm sample strips under a pressure of 5 MPa, and dried at 80 ℃ for 12 hours. The refractoriness of each group of bonds was measured using a standard refractory cone, the flowability of the bonds was measured using the plane flow method, and the thermal expansion coefficient of the bonds was determined. According to the refractoriness data determined by each formula, sintering was carried out at a temperature 60 ℃ higher than the refractoriness of the bond. A microcomputer-controlled electronic universal testing machine was used to determine the flexural strength of the bond using the three-point bending method. The microhardness of the bond was measured using a microhardness tester, and the microstructure of the bond was analyzed. Results: From the analysis of the measured performance data, it can be concluded that: (1) B₂O₃ has the effect of reducing the refractoriness in vitrified bonds, while SiO₂ and Al₂O₃ increase the refractoriness of the bonds. Al₂O₃ has a greater impact on the refractoriness of the bonds than SiO₂. (2) B₂O₃has the effect of improving the flowability of bonds, while Al₂O₃ reduces the flowability of bonds. The thermal expansion coefficient and the flexural strength of the bond will vary depending on the content of Al₂O₃ and B₂O₃. When the Al₂O₃ content in the bond is high, the thermal expansion coefficient of the bond will first decrease and then increase with the increase of B₂O₃ content, and the flexural strength will first increase and then decrease with the increase of B₂O₃ content. When the Al₂O₃ content in the bond is low, the thermal expansion coefficient of the bond will increase with the increase of B₂O₃ content, and the flexural strength will decrease with the increase of B₂O₃ content. When the SiO₂ content is fixed, the thermal expansion coefficient of the bond will increase with the increase of B₂O₃ content, and the flexural strength will increase with the increase of Al₂O₃ content. When the B₂O₃ content is fixed, the thermal expansion coefficient of the bond will increase with the increase of Al₂O₃ content, and the flexural strength will increase with the increase of B₂O₃ content. The influence of each component in the bond on the microhardness change of the bond is SiO₂>B₂O₃>Al₂O₃. When the molar ratio of Al₂O₃+B₂O₃ to Na₂O in the bond is less than 1, Al₂O₃ and B₂O₃ will combine with oxygen ions in Na₂O to form [AlO₄] and [BO₄], which participate in the network structure of the bond and densify it. Breaking the dense network structure requires higher energy. Therefore, densification of the network structure in the bond can reduce its thermal expansion coefficient and improve its flexural strength and microhardness. When n(Al₂O₃+B₂O₃)/n(Na₂O)>1, the oxygen ions in Na₂O are insufficient, and Al₂O₃ and B₂O₃ form [AlO₃] and [BO₃] triangles, reducing the density of the network structure. The fluffy structure makes the network structure more sensitive to energy, increasing the thermal expansion coefficient of the bond and reducing its flexural strength and microhardness. Conclusions: A ternary phase diagram based on the content of Al₂O₃, B₂O₃, and SiO₂ in the R₂O-Al₂O₃-B₂O₃-SiO₂ system bond can intuitively reflect the synergistic effect of the three components during sintering. The three components will exhibit different effects in bonds with different contents, and their impact on the performance of the bond will also be different. When designing the formula for vitrified bonds, it is necessary to consider the roles of different components in the bond and their interactions with other components.
- vitrified bond components,
- ternary phase diagram,
- thermal expansion coefficient,
- mechanical property

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References(21)

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