Consolidation of MA W-Ni-Fe Alloyed Powder by Microwave-Assisted Sintering

Liu, Wensheng; Ma, Yunzhu; Cai, Qingshan

doi:10.4236/msa.2011.26082

Cited by 3 publications

(2 citation statements)

References 12 publications

(14 reference statements)

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“…More importantly, 45S5 can provide a liquid phase during the sintering of β-TCP due to the low melting point of 45S5 (about 1050 °C) compared with the sintering temperature of β-TCP (about 1100–1180 °C) [22,23]. The liquid phase may promote an additional diffusion mechanism of dissolution/precipitation, and affect particle rearrangement and capillary forces during the sintering process [24,25,26,27], which improves the densification and mechanical properties. In addition, 45S5 has unique bone bonding ability, which can provide faster response of the bone healing and bonding processes [28].…”

Section: Introductionmentioning

confidence: 99%

Liquid Phase Sintered Ceramic Bone Scaffolds by Combined Laser and Furnace

Feng

Deng

Duan

et al. 2014

IJMS

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Fabrication of mechanically competent bioactive scaffolds is a great challenge in bone tissue engineering. In this paper, β-tricalcium phosphate (β-TCP) scaffolds were successfully fabricated by selective laser sintering combined with furnace sintering. Bioglass 45S5 was introduced in the process as liquid phase in order to improve the mechanical and biological properties. The results showed that sintering of β-TCP with the bioglass revealed some features of liquid phase sintering. The optimum amount of 45S5 was 5 wt %. At this point, the scaffolds were densified without defects. The fracture toughness, compressive strength and stiffness were 1.67 MPam1/2, 21.32 MPa and 264.32 MPa, respectively. Bone like apatite layer was formed and the stimulation for apatite formation was increased with increase in 45S5 content after soaking in simulated body fluid, which indicated that 45S5 could improve the bioactivity. Furthermore, MG-63 cells adhered and spread well, and proliferated with increase in the culture time.

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Section: Introductionmentioning

confidence: 99%

Liquid Phase Sintered Ceramic Bone Scaffolds by Combined Laser and Furnace

Feng

Deng

Duan

et al. 2014

IJMS

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“…In this experimental study, the powders are heated at a very high heating rate of 100°C/min, and the solid-state sintering induces cohesion between the powders before complete melting occurs. The temperature is considerably low in SPS as compared to microwave sintering [28]. The grain growth on sintering is manifested with finer grains and thus makes it feasible for the Mo to diffuse through the matrix increasing the relative density of the alloys.…”

Section: Puritymentioning

confidence: 99%

Bulletin of the Polish Academy of Sciences: Technical Sciences

Prasad¹,

Annamalai²

2019

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Tungsten heavy alloys comprising tungsten, nickel and ferrous were modified, where molybdenum was added in varying weight proportions keeping the ratio of Ni: Fe (8:2) constant. The powders were mixed in a high-energy ball mill and were further fabricated using the spark plasma sintering (SPS) method at a peak temperature of 1000°C with heating rate of 100°C/min. The details of the microstructure and mechanical properties of these various alloy compositions were studied. With the increasing weight composition of the Mo in the alloy, the relative density of the alloy increased with a significant improvement in all the mechanical properties. The yield strength (YS), ultimate tensile strength (UTS) and hardness improved significantly with increase in the proportion of Mo; however, a reduction in elongation percentage was observed. The maximum strength of 1250 MPa UTS was observed in the alloy with a Mo proportion of 24%. The heavy alloy unmixed with Mo has shown distinct white and grey regions, where white (W) grain is due to tungsten and grey region is a combinatorial effect of Ni and Fe. Upon addition of Mo, the white and gray phase differences started to minimize resulting in deep gray and black 'C'-phase structures because of homogenization of the alloy. The main fracture mode found during this investigation in the alloys was inter-granular mode.

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