Microstructure, residual stresses and shear strength of diamond–steel-joints brazed with a Cu–Sn-based active filler alloy

Buhl, Sebastian; Leinenbach, Christian; Spolenak, Ralph; Wegener, Konrad

doi:10.1016/j.ijrmhm.2011.06.006

Cited by 109 publications

(28 citation statements)

References 45 publications

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“…As brazing temperature increasing, the graphite peak at 1585 cm -1 became stronger, suggesting more C atoms have precipitated as graphite. Previous research on the shear strength of brazed diamond grist revealed that, when temperature was increased from 880 to 980 o C, the shear strength of the brazed diamond grits decreased from (321±107) to (78±30) MPa [25]. Buhl et al…”

Section: Implications For Integrity Of Brazed Diamond Gritsmentioning

confidence: 97%

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Formation of TiC via interface reaction between diamond grits and Sn-Ti alloys at relatively low temperatures

Liao

Wang

et al. 2017

International Journal of Refractory Metals and Hard Materials

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In this paper, interfacial reaction between diamond grit and Sn-6Ti alloy was systematically studied at brazing temperatures from 600 to 1030 o C. A thin and uniform layer of scallop-like nano-sized TiC grains was formed after brazing for 30 minutes at 600 o C, and interfacial TiC grains subsequently coarsened as brazing temperature increased to 740 and 880 o C. Strip-like columnar TiC grains in a bilayer structure was further grown as brazing temperature increased to 930 o C. After brazing at 1030 o C, a dense layer of columnar TiC grains were formed. Based on the TEM micrographs of interfacial TiC, the formation and evolution of the growth morphologies of interfacial TiC was believed to be controlled by the diffusion of C flux from diamond grits, which is dependent on the brazing temperatures.

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Section: Implications For Integrity Of Brazed Diamond Gritsmentioning

confidence: 97%

“…have attributed this abrupt drop of shear strength to the linear increase of thermal stress against the increased brazing temperature [25]. From interfacial reactions prospective, the enhanced dissolution of C atoms and graphitization should also be responsible for the decrease of bonding strength of brazed diamond grits…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Formation of TiC via interface reaction between diamond grits and Sn-Ti alloys at relatively low temperatures

Liao

Wang

et al. 2017

International Journal of Refractory Metals and Hard Materials

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“…On one hand, the fracture behavior of PCBN grain was strongly influenced by the bonding effect of the AlN binder among the adjacent microcrystalline CBN powders (Figure 1(c)). The brittle resultants and residual thermal stresses formed during brazing also made it possible to create the microcrack propagation and microfracture [19,20]. On the other hand, the thermal-mechanical loads during grinding led to the occurrence of grain macrofracture.…”

Section: Wear Properties Of Multicrystalline Cbn Abrasive Grainsmentioning

confidence: 99%

Comparative Investigation on Brazing Behavior, Compressive Strength, and Wear Properties of Multicrystalline CBN Abrasive Grains

Ding

Zhu

et al. 2014

Advances in Mechanical Engineering

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In order to fabricate the abrasive wheels with good grain self-sharpening capacity, two types of multicrystalline CBN grains, that is, polycrystalline CBN (PCBN) and binderless CBN (BCBN), were brazed using Cu-Sn-Ti alloy, respectively. Comparative investigation on the brazing interface, compressive strength, and wear properties of the different grains was carried out. Results obtained show that the PCBN grains have more intricate reaction, more complicated resultants, and thicker reaction layer than the BCBN counterparts under the identical brazing conditions. Though the average compressive strength of the PCBN grains is similar to that of BCBN ones, stronger self-sharpening action by virtue of the microfracture behavior takes place with BCBN grains during grinding. As a consequence, compared to the brazed PCBN wheels and the conventional monocrystalline CBN (MCBN) ones, longer service life is obtained for the brazed BCBN wheels.

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“…strength and fracture toughness, as well as the occurring residual stresses are relevant, it is independent of the used filler alloy. In [55,56], the residual stresses of brazed diamonds were investigated. It was found that the magnitude is in the same range (≈−350 MPa) for two filler alloys.…”

Section: Failure Mechanismsmentioning

confidence: 99%

“…The bond strengths of diamond grains are compared to those of block-shaped monocrystalline diamonds, which were determined in [55,56]. The filler alloys, the substrate material and the brazing conditions were the same, only the diamond geometry was changed.…”

Section: Failure Mechanismsmentioning

confidence: 99%

Failure mechanisms and cutting characteristics of brazed single diamond grains

Buhl

Leinenbach

Spolenak

et al. 2012

Int J Adv Manuf Technol

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The knowledge about the cutting characteristics and the critical loading of brazed diamonds is essential for a safe and economic application of engineered grinding tools. Scratch tests were performed with single grains. The experiments were conducted with standard polyhedral diamond grains of different sizes, ranging from 300 to 850 μm, brazed with an Ag-Cu-based and a Cu-Sn-based active filler alloy onto a steel pin. Two failure mechanisms were revealed, namely "grain pullout" and "grain fracture". Large grits mainly fail by grain fracture, whereas the smaller ones were mostly pulled out. This trend is supported by a simple mechanical model. The critical values, i.e. cutting force/scratch area, for grain fracture and grain pullout show a decrease with bigger grit size. Scratches are also analysed in terms of cutting characteristics. The dependency of the cutting and the normal force on the scratch area can be described by a power law with powers ranging between about 0.2 and 0.7, respectively. The measured cutting forces strongly depend on the rake angle, which was tested for −19.5°and −35.3°.

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Microstructure, residual stresses and shear strength of diamond–steel-joints brazed with a Cu–Sn-based active filler alloy

Cited by 109 publications

References 45 publications

Formation of TiC via interface reaction between diamond grits and Sn-Ti alloys at relatively low temperatures

Formation of TiC via interface reaction between diamond grits and Sn-Ti alloys at relatively low temperatures

Comparative Investigation on Brazing Behavior, Compressive Strength, and Wear Properties of Multicrystalline CBN Abrasive Grains

Failure mechanisms and cutting characteristics of brazed single diamond grains

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