Effect of TiH<sub>2</sub> addition on grinding performance of Cu<sub>3</sub>Sn intermetalliccompound diamond wheels

HE Keqiao; CHEN Shuaipeng; KANG Xiyue; HE Yuehui

doi:10.13394/j.cnki.jgszz.2023.0261

Volume 45 Issue 1

Mar. 2025

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HE Keqiao, CHEN Shuaipeng, KANG Xiyue, HE Yuehui. Effect of TiH2 addition on grinding performance of Cu3Sn intermetalliccompound diamond wheels[J]. Diamond & Abrasives Engineering, 2025, 45(1): 12-20. doi: 10.13394/j.cnki.jgszz.2023.0261

Citation:

HE Keqiao, CHEN Shuaipeng, KANG Xiyue, HE Yuehui. Effect of TiH₂ addition on grinding performance of Cu₃Sn intermetalliccompound diamond wheels[J]. Diamond & Abrasives Engineering, 2025, 45(1): 12-20. doi: 10.13394/j.cnki.jgszz.2023.0261

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Effect of TiH₂ addition on grinding performance of Cu₃Sn intermetalliccompound diamond wheels

doi: 10.13394/j.cnki.jgszz.2023.0261

State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

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Received Date: 2023-12-01
Accepted Date: 2024-03-18
Rev Recd Date: 2024-03-04

Available Online: 2024-06-21

Abstract

Abstract

Objectives With the development of the modern manufacturing industry, the requirements for material machining accuracy and surface quality are increases continuously. For the precision grinding of high hardness and high wear-resistant materials, superhard material grinding wheels are required to possess high processing efficiency and durability. Intermetallic compound bond diamond grinding wheels have the wear resistance of metal grinding wheels and the self-sharpness of ceramic grinding wheels simultaneously, but they still lacks of sharpness or shape retention when machining hard and brittle materials at high loads and high speeds. To improve the sharpness and shape retention of Cu₃Sn intermetallic compound diamond grinding wheels, this study investigates the addition of TiH₂. Cu₃Sn ball-milling powders, diamond grinding blocks, and grinding wheels with different TiH₂ additions are prepared. Methods The effects of TiH₂ addition on the grinding performance of Cu₃Sn intermetallic diamond grinding wheels are investigated using testing and analyzing the micro-morphology, oxygen content, physical phase composition, thermal effect, and mechanical properties. Results (1) TiH₂ was added to the Cu₃Sn intermetallic compound bond, and the mixture is ball milled together. TiH₂ inhibits the increase in oxygen content, which improves the properties of the ball-milled bond powder and facilitated the sintering process. When TiH₂ is added with a mass fraction of 2.0%, the oxygen content is reduced from 0.67% to a minimum value of 0.51%. (2) TiH₂ decomposes into Ti and H₂ during the sintering process, and Ti could react with the C atoms on the surface of the diamond to form a Ti—C bond. This chemical bonding between the metal bond and diamonds could increased the bonding strength. TiH₂ could improve the mechanical properties of diamond grinding blocks, but a larger amount of TiH₂ increased the pores in the metal bond, which reduced its strength. When TiH₂ mass fraction is 1.5%, the flexural strength reaches the maximum value of 80.74 MPa, and the addition of 2.0% TiH₂ increased the Rockwell hardness to reaches a maximum value of 109.88 HRB. (3) Adding of an appropriate amount of TiH₂ forms a chemical metallurgical bond between diamonds and the bonding agent, which strengthens the holding force of the bonding agent to the diamonds, increases the protrusion height and chip space on the working surface, and improves the sharpness of the grinding wheel. At the same time, it can avoid the premature shedding of diamonds, reducing the consumption of the working layer and improving the shape retention of the grinding wheel. The grinding wheels prepared by adding a certain amount of TiH₂ prior to the ball milling treatment of Cu₃Sn bond powder exhibited better grinding performance. Both sharpness and shape retention are enhanced. When grinding YG8 cemented carbide, the addition of 2.0% TiH₂ enhanced the fastest feed rate of the grinding wheel from 0.020 mm/feed to 0.035 mm/feed. Meanwhile, the grinding ratio of the wheel reached a maximum value of 172.03, which is enhanced by 237% compared with the specimen without TiH₂ addition. Conclusions In this paper, TiH₂ is added to Cu₃Sn intermetallic compounds by ball milling, and the oxygen content of the bond powder is reduced. At the same time, the carbide-formation element Ti reacts with the diamond to form a chemical metallurgical bond, which improves the bonding strength between the diamond and the bonding agent. This results in improved grinding performance of the diamond wheel and provides a reference for the design and development of diamond grinding wheels with high sharpness and high conformal retention.
- TiH₂,
- intermetallic compounds,
- mechanical properties,
- grinding ratio

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References(17)

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