Interfacial failure modelling of diamond bits made of particulate composites

Xu, Juechun; Sheikh, Abdul Hamid; Xu, Chaoshui

doi:10.1016/j.compstruct.2016.07.075

Cited by 13 publications

(6 citation statements)

References 31 publications

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“…where P y is the tensile yield stress for the matrix material; R is the radius of the plastic zone; K m , µ m and α m are the bulk modulus, shear modulus and coefficient of thermal expansion of the matrix respectively; K 1 and α 1 are the bulk modulus and coefficient of thermal expansion of the diamond, respectively; and ∆T is the temperature decrease during cooling. In recent years, numerical computation methods have been widely used to study diamond retention in the matrix, and have been utilized to evaluate thermal residual stresses [92][93][94][95], local plastic deformation [13,96] and interfacial pullout behavior [4,11]. Cracks are easily generated at the interface due to large thermal stresses; a decrease in thermal residual stress is beneficial to diamond retention strength [29].…”

Section: Mechanical Calculation Methodsmentioning

confidence: 99%

“…The pressure and the elastic energy of a diamond particle and the strain of the deformed matrix around the particle (radius of plastic zone) are good indicators of the efficiency of mechanical retention [97][98][99][100]. Diamond retention is estimated by determining the critical force required to pull out the diamond particle from the matrix [4,11,101].…”

Section: Mechanical Calculation Methodsmentioning

confidence: 99%

“…There are two basic functions required in the metal matrix [10]. First, the matrix needs to wear at a rate compatible comparable to that of the diamond-due to their self-sharpening ability, worn diamonds fall out to allow new diamonds to continuously be exposed [4,11]. The second and equally important function of the matrix is to hold the diamonds firmly in place to avoid them falling-out too early [12].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Mechanical Calculation Methodsmentioning

confidence: 99%

Section: Mechanical Calculation Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Review of the Diamond Retention Capacity of Metal Bond Matrices

Xiao-jun

Duan

2018

Metals

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“…The difference in wear forms between P2 and P3 can be explained by the difference in the force required to pull out the entire particle F p . F p can be estimated roughly by F p = τA, 49 where τ is the interfacial strength and A is the total interfacial area of buried portion. Based on SEM images after FIB cutting, it is possible to make a rough estimate of A which is about 5.6 μm 2 for P2 and 1.5 μm 2 for P3 (Figure 5e).…”

Section: Friction?mentioning

confidence: 99%

Observing and Modeling the Wear Process of Heterogeneous Interface

Tang,

Song,

et al. 2024

Nano Lett.

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Understanding and controlling the wear process of heterogeneous interfaces between soft and hard phases is crucial for designing and fabricating materials, such as improving the wear resistance of particle reinforced metal matrix composites and the accuracy and efficiency of chemical mechanical polishing. However, the wear process can be hardly observed, as interfaces are buried under the surface. Here, we proposed a nanowear test method by combining focused ion beam cutting to expose interfaces, atomic force microscopy to rub against interfaces, and scanning electron microscope to characterize the interface damage. Using this method, three typical wear forms had been observed in Al/SiC composite, i.e., merely matrix wear, particle fracture, and particle pullout. A theoretical model was proposed that revealed that the increasing interfacial friction would induce particle fracture or pullout, depending on the particle edge angle and tip edge angle. This work sheds light on wear control in composites and nanofabrication.

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“…As a result of this low bond strength, diamond grits typically fracture and/or flake off the Ni layer, which accelerates wear between the surfaces subject to tribological contact. Furthermore, the thermal expansion mismatch between diamond and the self-sharpening metal matrix must be minimized, since the high residual compressive stresses accumulated at the interface, which are responsible for the mechanical retention capacity, might lead to the early dislodging of the embedded diamond particles [14]. There are many different alternative techniques capable of achieving a better level of metal-to-diamond bonding to overcome these problems nowadays, such as: the molten salt method [15], chemical vapor deposition [16], plasma spray [17], spark plasma sintering [18], hot isostatic pressing [19], and laser brazing methods [20], which have been employed in the manufacture of different metal-bonded diamond abrasive tools with different results.…”

Section: Introductionmentioning

confidence: 99%