Molybdenum Silicides as a Bonding Phase in Diamond Composites

Abstract

Molybdenum silicides were obtained by the self-propagating synthesis (SHS) method. Diamond composites containing 30 mass% of MoSi2 or Mo5Si3 bonding phase had been prepared using HT-HP Bridgman type apparatus. Sintering of the diamond composites were carried out at 2073±50 K and 8±0.2 GPa. The interactions in diamond-silicide composites were studied by means of X-ray diffractometry and transmission electron microscopy (TEM). Results of both mechanical properties and thermal resistance measurements are reported. Hardness HV1 for the composite with the predominantly MoSi2 bonding phase was found to be around 42 GPa. After heat treatment in 1200 °C for 30 min. in vacuum HV1 decreases to 29 GPa. In the second composite containing the Mo5Si3 bonding phase the HV1 of 28.0 GPa after thermal exposure changes to 21.0 GPa.

Surface layer characteristics due to slide diamond burnishing with a cylindrical-ended tool

“…Sintered on the Ti 3 SiC 2 base, diamond composite cylindrical tools made by this method, can have even up to a dozen or so millimeters in diameter. Jaworska et al (2001) described the method of making such tools in their work. The tools had to be fitted into special holders.…”

Performance and wear mechanisms of novel superhard diamond and boron nitride based tools in machining Al-SiCp metal matrix composite

“…3. D-MAX95 -experimental polycrystalline diamond material where the bonding of diamond is realized via decomposition of Ti3SiC2 MAX-phase during the sintering, release of TiC, elemental silicon and titanium and their subsequent reaction with the diamond [9]. Mixture of 95 vol.% diamond and 5 vol.% Ti3SiC2 was subjected to the sintering process ( Fig.…”

Some aspects of combining the burnishing processes of metal and alloys with other treatments

“…Vc = 150 m/min. Warunki procesu nagniatania ślizgowego kompozytem diamentowych z ceramiczną fazą wiążącą Ti3SiC2 [26,27], który jest wytwarzany w IZTW dobrano w oparciu o wcześniejsze badania optymalizacyjne [28]. Wyniki tych badań pozwoliły na określenie najkorzystniejszych parametrów wpływających na wygładzenie powierzchni nagniatanej przy posuwie f = 0,02 mm/obr.…”