scholarly journals Characteristics of powder metallurgy pure titanium matrix composite reinforced with multi-wall carbon nanotubes

2009 ◽  
Vol 69 (7-8) ◽  
pp. 1077-1081 ◽  
Author(s):  
Katsuyoshi Kondoh ◽  
Thotsaphon Threrujirapapong ◽  
Hisashi Imai ◽  
Junko Umeda ◽  
Bunshi Fugetsu
Keyword(s):  
Carbon Nanotubes ◽  
Powder Metallurgy ◽  
Matrix Composite ◽  
Pure Titanium ◽  
Titanium Matrix ◽  
Titanium Matrix Composite ◽  
Multi Wall Carbon Nanotubes

scholarly journals Mechanical Properties of a Titanium Matrix Composite Reinforced with Low Cost Carbon Black via Powder Metallurgy Processing

2009 ◽  
Vol 50 (12) ◽  
pp. 2757-2762 ◽  
Author(s):  
Thotsaphon Threrujirapapong ◽  
Katsuyoshi Kondoh ◽  
Hisashi Imai ◽  
Junko Umeda ◽  
Bunshi Fugetsu
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Carbon Black ◽  
Matrix Composite ◽  
Low Cost ◽  
Titanium Matrix ◽  
Titanium Matrix Composite

scholarly journals TiB Nanowhisker Reinforced Titanium Matrix Composite with Improved Hardness for Biomedical Applications

Nanomaterials ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2480
Author(s):  
Joseph A. Otte ◽  
Jin Zou ◽  
Rushabh Patel ◽  
Mingyuan Lu ◽  
Matthew S. Dargusch
Keyword(s):  
Mechanical Properties ◽  
Aspect Ratio ◽  
Matrix Composite ◽  
Low Cost ◽  
Pure Titanium ◽  
Commercially Pure Titanium ◽  
Modulus Ratio ◽  
Titanium Matrix ◽  
Wear Properties ◽  
Titanium Matrix Composite

Titanium and its alloys have been employed in the biomedical industry as implants and show promise for more broad applications because of their excellent mechanical properties and low density. However, high cost, poor wear properties, low hardness and associated side effects caused by leaching of alloy elements in some titanium alloys has been the bottleneck to their wide application. TiB reinforcement has shown promise as both a surface coating for Ti implants and also as a composite reinforcement phase. In this study, a low-cost TiB-reinforced alpha titanium matrix composite (TMC) is developed. The composite microstructure includes ultrahigh aspect ratio TiB nanowhiskers with a length up to 23 μm and aspect ratio of 400 and a low average Ti grain size. TiB nanowhiskers are formed in situ by the reaction between Ti and BN nanopowder. The TMC exhibited hardness of above 10.4 GPa, elastic modulus above 165 GPa and hardness to Young’s modulus ratio of 0.062 representing 304%, 170% and 180% increases in hardness, modulus and hardness to modulus ratio, respectively, when compared to commercially pure titanium. The TiB nanowhisker-reinforced TMC has good biocompatibility and shows excellent mechanical properties for biomedical implant applications.

Un-Bundled Carbon Nanotubes Reinforced Light Metal Composites via Powder Metallurgy Route

2011 ◽  
Vol 690 ◽  
pp. 339-342
Author(s):  
Katsuyoshi Kondoh ◽  
Thotsaphon Threrujirapapong ◽  
Hiroyuki Fukuda ◽  
Junko Umeda
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Tensile Strength ◽  
Powder Metallurgy ◽  
Pure Titanium ◽  
Hot Extrusion ◽  
Light Metal ◽  
Dispersion Strengthening ◽  
Multi Wall Carbon Nanotubes

By using light metal (Mg, Al, Ti) powders coated with un-bundled multi-wall carbon nanotubes (MWCNTs) via wet process, powder metallurgy (P/M) light metal matrix composite reinforced with un-bundled nanotubes was prepared by spark plasma sintering (SPS) and subsequently hot extrusion process. The microstructure and mechanical properties of the composites were evaluated. In the case of pure titanium, the distribution of CNTs and in-situ formed titanium carbide (TiC) compounds during sintering was investigated by optical and scanning electron microscopy (SEM) equipped with EDS analyzer. The mechanical properties of TMC were significantly improved by the additive of CNTs. For example, when employing the pure titanium composite powder coated with CNTs of 0.35 mass%, the increase of tensile strength and yield stress of the extruded TMC was 157 MPa and 169 MPa, respectively, compared to those of extruded titanium materials with no CNT additive. Fractured surfaces of tensile specimens were analyzed by SEM, and the uniform distribution of CNTs and TiC particles, being effective for the dispersion strengthening, at the surface of the TMC were obviously observed. In the case of Mg-Al alloys, in-situ formation of Al2MgC2compounds at the interface between CNTs and Mg-matrix occurred and effective for the tensile transfer loading, and resulted in the increment of tensile strength of the composite material.

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