Consolidation of diamond tools using Cu–Co–Fe based alloys as metallic binders

Abstract

the diamond particles are bonded to the metallic matrix by a combination of chemical and mechanical interactions. The present work reports the results obtained on the This is a process that needs a close control of processing evaluation of both the response of commercially availparameters to avoid diamond dissolution, attack, and/or able Cu-Fe-Co pre-alloyed powders during prographitisation that could deteriorate the final cutting cessing for the consolidation of diamond tools under performance.2,3 several fabrication routes, and the performance of the For a specific application, the optimisation of a diamond tools during in field cutting operations. The new tool performance requires finding the right combination of metallic binders look attractive since they combine diamond grits (concentration, particle size, quality, and good sinterability with adequate values of hardness shape) and metal matrix. In general, the metallic binder and wear resistance, as observed from the cutting tests must be tailored to wear at the same rate that the diamond carried out on granite and marble. The consolidation grits, so that when a set of diamonds is worn, a new set is routes under research were conventional hot pressing, exposed to continue cutting.2 pressureless sintering, and hipping after sintering. The Cobalt is the main component of the binder phase of amount of copper contained in these alloys leads to most diamond tools. It combines acceptable chemical fully dense parts by hot pressing at temperatures compatibility with diamond at the processing temperatures, approximately 150°C lower than those used for adequate diamond retention and good wear resistance after cobalt. Pressureless sintering experiments showed a number of cutting operations.2,4,5 However, cobalt is that full densification requires the application of hipsubjected to price fluctuations in the market, is a strategic ping post-sintering treatments. During processing material, and does not seem to be the best choice for every under non-reducing atmospheres, the presence of type of application. Therefore, recently, research has focused metallic oxides contained in the powder was observed on widening the choice of alloys that could be alternatively to exert a direct influence on the degradation of the used or at least reduce the cobalt content in diamond diamond grits.PM/0902 tools.6-8 The search for novel metallic binders to be used for the fabrication of diamond cutting tools has produced Dr Castro, Dr Iturriza, and Dr Sa ´nchez are at the an intensification of research activities in this field thus Centro de Estudios e Investigaciones Te ´cnicas de widening the choice of metal powders for this purpose. On Guipu ´zcoa (CEIT), Department of Materials, Paseo this basis, commercially available powders containing Cu, de Manuel Lardiza ´bal, 15, 20018, San Sebastian, Fe, and Co in predetermined ratios have been produced Spain, Dr del Villar and P. Muro are in the Escuela and launched by a powder producer under the name Superior de Ingenieros, University of Navarr...

Processing and characterization of a cobalt based alloy for use in diamond cutting tools

“…One can observe that the final stage of sintering was reached -homogeneously distributed spheroidal porosity. Other important aspect is the presence of two phases -one darker and other brighter -these were semi-quantitatively measured by EDS in fig.2 XRD patern in fig.3 makes clear the cited solid solutionsthis pattern is very similar to that found by del Villar et al [5]. Figure 4 shows that the NEXT100 alloy lays in the Cu(fcc) + a-Fe(bcc) region.…”

Microstructure and mechanical properties of a novel Cu-Fe based matrix for diamond segments

“…The low melting point metals such as Sn and Cu powders surface will be defused and tend to form a large amount of liquid phase, such as Cu-Sn solid-solution alloy, which reduces the friction between the powder particles, thus the pore closure occurred [7] . Secondly, further plastic flow among the high strain deformed powder particles will be improved, which results in a high dense in the pressure-assisted sintering [1] . Thirdly, the Cu-Fe based system possess a higher sintering temperature that increases the sintering degrees among the other metal powders, because of the high melting point of Iron [8,9] .…”

“…Previously, cobalt is the main component (18-25 wt. %) of the metallic binder on the account of good wetting ability and acceptable chemical compatibility with diamond [1,2] . However, acts as a strategic material, the trade price of Co is expensive in market.…”

Efeito Do Processo De Mistura Utlizado Para O Desenvolvimento De Compósitos Diamantados Para Aplicação Em Discos De Corte De Rochas Ornamentais

“…As ferramentas de corte circulares possuem segmentos que são constituídos de MCM, onde os diamantes são incorporados em uma matriz metálica e são sinterizados para garantir a forte combinação dos grãos de diamantes na matriz no decorrer do corte. Segundo Villar et al [2] o cobalto é um componente que possui uma compatibilidade com o diamante e possui boa molhabilidade da liga metálica no diamante [3,4]. Segundo Zaitsev et al [5] a liga Cu-Ni-Fe-Sn utilizada como base para a matriz metálica nas ferramentas de corte promovem uma forte ligação entre as partículas metálicas e têm um efeito significativo sobre a cinética de sinterização.…”