Comparison of brazed and sintered diamond tools for grinding of stone

Yu, Yiqing; Tie, Xiaorui; Zhang, G. Q.; Huang, Guoqin; Huang, Hui; Xu, Xipeng

doi:10.1179/1432891714z.000000000525

Cited by 9 publications

(4 citation statements)

References 14 publications

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“…The Gibbs free energy of Cr 3 C 2 formation was reported as in the reaction between Cr and diamond [20]. Thus, a chemical combination may occur because of the high negative value at the brazing temperature and some similar findings can support this inference [21,22]. However, the specific migration process (i.e.…”

Section: Resultsmentioning

confidence: 99%

Influence of tungsten coating on microstructure and thermal damage of brazed diamonds

Liu

Yang

Pan

2019

Surface Engineering

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Degradation of diamond strength resulting from thermal damage in vacuum brazing process constrains the application of Ni-based brazed diamond tools. To reduce the thermal damage to brazed diamonds, the effectiveness of coating diamond with tungsten was investigated by scanning electron microscopy, Raman spectroscopy and friability test. Tungsten coating was deposited on diamond surfaces by vacuum diffusion method. The experimental results show that tungsten coating, as a buffering layer, plays a stress-relaxing role and brings about fewer cracks in the Ni-based matrix near diamond grains. Graphitization of W-coated diamond after brazing is much slighter than that of uncoated diamond and Ti-coated diamond, according to the morphology and Raman spectra. The isolation of diamond from nickel catalyst by tungsten coating inhibits the graphitization of diamond, which can further explain the increase in the toughness index of brazed diamonds.

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Section: Resultsmentioning

confidence: 99%

Influence of tungsten coating on microstructure and thermal damage of brazed diamonds

Liu

Yang

Pan

2019

Surface Engineering

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“…The maximum mean protrusion height of diamond grains is employed by some researchers to evaluate diamond retention in the diamond tools industry [87][88][89]. The retention strength is characterized by a constant τ:…”

Section: Mechanical Calculation Methodsmentioning

confidence: 99%

A Review of the Diamond Retention Capacity of Metal Bond Matrices

Xiao-jun

Duan

2018

Metals

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This article presents a review of the current research into the diamond retention capacity of metal matrices, which largely determines the service life and working performance of diamond tools. The constitution of diamond retention capacity, including physical adsorption force, mechanical inlaying force, and chemical bonding force, are described. Improved techniques are summarized as three major types: (1) surface treatment of the diamond: metallization and roughening of the diamond surface; (2) modification of metal matrix: the addition of strong carbide forming elements, rare earth elements and some non-metallic elements, and pre-alloying or refining of matrix powders; (3) change in preparation technology: the adjustment of the sintering process and the application of new technologies. Additionally, the methods used in the evaluation of diamond retention strength are introduced, including three categories: (1) instrument detection methods: scanning electron microscopy, X-ray diffractometry, energy dispersive spectrometry and Raman spectroscopy; (2) mechanical test methods: bending strength analytical method, tension ring test method, and other test methods for chemical bonding strength; (3) mechanical calculation methods: theoretical calculation and numerical computation. Finally, future research directions are discussed.

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“…To improve the service life, Chattopadhyay [7] fabricated monolayer brazed diamond tools to achieve chemical bonding between the diamond grits and matrix, in which diamond grits were embedded firmly in the brazed additive matrix. Yu et al [8] compared the monolayer brazed and sintered diamond tools used for grinding stone and found that both bonding force and protrusion height of the brazed diamond tool improved smoothly throughout the grinding process. Bonding force can be strengthened via the addition of some active elements, such as Ni and Ti, in the brazing alloy by forming a discontinuous transitional carbide layer during the brazing process [9,10].…”

Section: Introductionmentioning

confidence: 99%

Blade Segment with a 3D Lattice of Diamond Grits Fabricated via an Additive Manufacturing Process

Chen

Huang

et al. 2020

Chin. J. Mech. Eng.

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Diamond tools with orderly arrangements of diamond grits have drawn considerable attention in the machining field owing to their outstanding advantages of high sharpness and long service life. This diamond super tool, as well as the manufacturing equipment, has been unavailable to Chinese enterprises for a long time due to patents. In this paper, a diamond blade segment with a 3D lattice of diamond grits was additively manufactured using a new type of cold pressing equipment (AME100). The equipment, designed with a rotary working platform and 16 molding stations, can be used to additively manufacture segments with diamond grits arranged in an orderly fashion, layer by layer; under this additive manufacturing process, at least 216000 pcs of diamond green segments with five orderly arranged grit layers can be produced per month. The microstructure of the segment was observed via SEM and the diamond blade fabricated using these segments was compared to other commercial cutting tools. The experimental results showed that the 3D lattice of diamond grits was formed in the green segment. The filling rate of diamond grits in the lattice could be guaranteed to be above 95%; this is much higher than the 90% filling rate of the automatic array system (ARIX). When used to cut stone, the cutting amount of the blade with segments made by AME100 is two times that of ordinary tools, with the same diamond concentration. When used to dry cut reinforced concrete, its cutting speed is 10% faster than that of ARIX. Under wet cutting conditions, its service life is twice that of ARIX. By applying the machine vision online inspection system and a special needle jig with a negative pressure system, this study developed a piece of additive manufacturing equipment for efficiently fabricating blade segments with a 3D lattice of diamond grits.

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Comparison of brazed and sintered diamond tools for grinding of stone

Cited by 9 publications

References 14 publications

Influence of tungsten coating on microstructure and thermal damage of brazed diamonds

Influence of tungsten coating on microstructure and thermal damage of brazed diamonds

A Review of the Diamond Retention Capacity of Metal Bond Matrices

Blade Segment with a 3D Lattice of Diamond Grits Fabricated via an Additive Manufacturing Process

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