Brazing of diamonds and cubic boron nitride

Rabinkin, A.; Shapiro, Alexander E.; Boretius, M.

doi:10.1533/9780857096500.2.160

Cited by 15 publications

(14 citation statements)

References 13 publications

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“…Obtaining crack-free metal-diamond composite is a challenging task because such material tends to graphitize at relatively high temperatures. As known [22,28], diamond particles tend to graphitize after heating to high temperatures about 1500 • C in the inert atmosphere and 1000 • C in the standard atmosphere. Nanodiamond graphitization at atmospheric pressure starts approximately in the temperature range of 670-800 • C [29].…”

Section: Resultsmentioning

confidence: 94%

Laser Fusion of Aluminum Powder Coated with Diamond Particles via Selective Laser Melting: Powder Preparation and Synthesis Description

et al. 2021

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This work aims to study the possibility of obtaining Al–C composite from AlSi10MgCu aluminum matrix with the addition of 500 nm-sized diamond particles by selective laser melting (SLM) process. Al–C composite powder was prepared by mechanical mixing to form a uniform cover along the surface of aluminum particles. The diamond content in the resulting AlSi10MgCu-diamond composite powder was equal to 0.67 wt %. The selection of the optimal SLM parameters for the obtained composite material is presented. For materials characterization, the following methods were used: scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and Raman spectroscopy. X-ray photoelectron spectroscopy (XPS) was applied after SLM printing for a detailed investigation of the obtained composites. The presence of carbon additives and the formation of aluminum carbides in the material after the SLM process were demonstrated.

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Section: Resultsmentioning

confidence: 94%

Laser Fusion of Aluminum Powder Coated with Diamond Particles via Selective Laser Melting: Powder Preparation and Synthesis Description

et al. 2021

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“…Furthermore, Buhl et al (2012) have successfully used this alloy to braze diamond particles on a steel substrate, achieving good bonding between the diamonds and the matrix material. This good bonding is due the 10 weight per cent content of titanium (and Zr) in the alloy, forming very stable and uniform epitaxial TiC layers at the interface between the brazing alloy and the diamond particles, as pointed out by Rabinkin et al (2013).…”

Section: Matrix Materialsmentioning

confidence: 84%

“…An important difference, however, is the cyclic heating impact on diamond particles due to the layer-wise build process, which basically supports the tendency of diamond to graphitize. As natural diamond is known to graphitize at temperatures between about 1,500°C in an inert atmosphere or vacuum and about 1,000°C in normal air or in diamond-metal composites (Rabinkin et al, 2013), a limitation of the melting temperature of the matrix material to values below about 1,000°C is beneficial. Temperatures above might also be acceptable because the graphitization process is slow, whereas the heating cycle is very short.…”

Section: Introductionmentioning

confidence: 99%

Processing of metal-diamond-composites using selective laser melting

Spierings

Leinenbach²,

Kenel

et al. 2015

Rapid Prototyping Journal

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Powder-bed based additive manufacturing processes such as Selective Laser Melting (SLM) offer a huge degree of freedom, both in terms of part design and material options. In that respect, mixtures of different materials in powder form can offer new ways for the manufacture of materials with tailored properties for special applications. A promising field of applications is e.g. additive manufacturing of metal-based cutting or grinding tools with incorporated hard phases. For that purpose a feasibility study was performed concerning SLM of a Cu-Sn-Ti alloy powder, which is usually used for active brazing of ceramics and superhard materials, containing 10-20 vol.-% artificial, Ni-coated mono-crystalline diamonds. Even though the processing parameters were not yet optimized, stable specimens containing intact diamonds could be produced. First results on density and microstructure are presented and discussed.

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“…It is a better semiconductor as compared to diamond and other commonly used semiconductors such as Si and GaN including, wide indirect band gap of 6.5 eV, can be doped as a shallow p-type semiconductor with Be and Mg and as an n-type with Si and Zn [13,14]. It is inert with regards to ferrous materials even at high temperatures while diamond forms iron carbide at about 600°C [3,5].These properties have motivated the use of c-BN in numerous industrial, chemical and electrical applications [15][16][17][18].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Cross-sectional transmission electron microscopy studies of boron ion implantation in hexagonal boron nitride

Aradi

Naidoo

Cummings

et al. 2019

Diamond and Related Materials

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We have reported on the implantation of boron ioninto hexagonal boron nitride (h-BN) material to aid the nucleation ofcubic boron nitride nanocrystals (nc-BN).Single crystal h-BN was implanted with boron ion at 150 keVat fluences of the order of 10 15 and10 17 ions/cm 2 at room temperature.High Angle Annular Dark-Field Scanning Transmission Electron Microscopy (HAADF-STEM) mapping showed a variation inimage contrast in samples irradiated to a fluence of 1×10 15 ions/cm 2. As predicted by Stopping Range and Ions in Materials (SRIM) calculations, the implanted region with the highest damage density appeared to have a bright contrast in HAADF-STEM which represented the high density c-BN symmetry. High Resolution Transmission Electron Microscopy (HRTEM) and electron diffraction measurements showed regions with nc-BN for samples implanted with low fluences and amorphous BN after implantation with high fluences indicating a fluence-related phase transition in BN. Raman spectroscopy showed the emergence of longitudinal optical frequency mode associated withc-BN after implantation.

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Brazing of diamonds and cubic boron nitride

Cited by 15 publications

References 13 publications

Laser Fusion of Aluminum Powder Coated with Diamond Particles via Selective Laser Melting: Powder Preparation and Synthesis Description

Laser Fusion of Aluminum Powder Coated with Diamond Particles via Selective Laser Melting: Powder Preparation and Synthesis Description

Processing of metal-diamond-composites using selective laser melting

Cross-sectional transmission electron microscopy studies of boron ion implantation in hexagonal boron nitride

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