scholarly journals Sintering of Ti-based biomedical alloys with increased oxygen content from elemental powders

2020 ◽  
Vol 321 ◽  
pp. 05010
Author(s):  
J. Stráský ◽  
J. Kozlík ◽  
K. Bartha ◽  
D. Preisler ◽  
T. Chráska
Keyword(s):  
Mechanical Properties ◽  
Oxygen Content ◽  
High Strength ◽  
Simple Approach ◽  
Fine Tuning ◽  
Powder Metallurgy Method ◽  
Ti Alloys ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Low Modulus

Revived interest for beta Ti alloys with increased oxygen content is motivated by the prospect of achieving material with low modulus and high strength simultaneously. Fine tuning of amount of oxygen and beta stabilizing elements is critical for achieving good mechanical properties. This study shows that powder metallurgy method of spark plasma sintering is capable of producing Ti-Nb-Zr-O alloys from elemental powders. This simple approach allows for quick sampling and production of several alloys with various chemical composition. Elemental powders were mixed with appropriate amount of titanium dioxide to achieve Ti-29Nb-7Zr-0.7O alloy. Sintering was performed at 1400 - 1500 °C for 15 – 30 minutes.

Fabrication of Titanium / Biodegradable-Polymer FGM for Medical Application

2009 ◽  
Vol 631-632 ◽  
pp. 199-204 ◽  
Author(s):  
Yoshimi Watanabe ◽  
Yoshimi Iwasa ◽  
Hisashi Sato ◽  
Akira Teramoto ◽  
Koji Abe
Keyword(s):  
Mechanical Properties ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Medical Application ◽  
Hot Water ◽  
Porous Ti ◽  
Ti Alloys ◽  
Plasma Sintering ◽  
Biodegradable Poly ◽  
Spark Plasma

Ti and Ti alloys are widely used as metallic implants, because of their good mechanical properties and nontoxic behavior. However, they have problems as the implant-materials, namely, high Young’s modulus comparing that of bone and low bonding ability with bone. There is a need to develop the Ti and Ti alloys with lower Young’s modulus and good bonding ability. In previous study, Ti composite containing biodegradable poly-L-lactic-acid (PLLA) fiber has been fabricated to improve these problems. However, this composite has low strength because of the imperfect sintering of Ti matrix. To improve its strength, sintering of Ti matrix should be completed. In this study, Ti-NaCl composite material was fabricated by spark plasma sintering (SPS) method using powder mixture of Ti and NaCl to complete the sintering of Ti matrix. To obtain porous Ti samples, Ti-NaCl composite were put into hot water of 100 oC. The porous Ti was dipped into PLLA melt in order to introduce PLLA into the pores of porous Ti. Finally, Ti-PLLA composite was obtained, and PLLA plays a role as reinforcement of Ti matrix. It was found that the Ti-PLLA composite has gradient structure and mechanical properties.

In Situ Decomposition of Silicon Nitride Particles in Titanium Composite and its Mechanical Properties

2017 ◽  
Vol 737 ◽  
pp. 38-43
Author(s):  
Hisashi Imai ◽  
Hiroyasu Yamabe ◽  
Katsuyoshi Kondoh ◽  
Junko Umeda ◽  
Anak Khantachawana
Keyword(s):  
Mechanical Properties ◽  
Silicon Nitride ◽  
Solid Phase ◽  
High Strength ◽  
Solid Solution Strengthening ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Solution Strengthening ◽  
Ti Powder

Dependence of the mechanical properties of PM extruded titanium with the silicon nitride (Si3N4) on solid phase decomposition of Si3N4 was investigated. Si3N4 particles within Ti composite powder were decomposed during spark plasma sintering at 1223 K with 30 MPa pressure for 3.6 ks; and then, decomposition by-products of nitrogen and silicon atoms were defused into titanium matrix. The extruded Ti-1.0 mass% Si3N4 composite showed ultimate tensile strength (UTS) of 1139 MPa, and yield stress (0.2%YS) of 1065 MPa. UTS and 0.2%YS of P/M extruded Ti-1.0 mass% Si3N4 composite were 2 and 2.5 times compared to extruded pure Ti powder material, respectively. It was considered that the solid solution strengthening of both nitrogen and silicon originated from Si3N4 caused the high strength of PM extruded Ti-1.0 mass% Si3N4 composite.

High-strength Al87Ni8La5 bulk alloy produced by spark plasma sintering of gas atomized powders

2009 ◽  
Vol 24 (9) ◽  
pp. 2909-2916 ◽  
Author(s):  
Sergio Scudino ◽  
Kumar B. Surreddi ◽  
Hoang V. Nguyen ◽  
Gang Liu ◽  
Thomas Gemming ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Spark Plasma Sintering ◽  
Room Temperature ◽  
Bulk Material ◽  
High Strength ◽  
Compression Tests ◽  
Bulk Alloy ◽  
Plasma Sintering ◽  
Spark Plasma

In situ devitrification and consolidation of gas atomized Al87Ni8La5 glassy powders into highly dense bulk specimens was carried out by spark plasma sintering. Room temperature compression tests of the consolidated bulk material reveal remarkable mechanical properties, namely, high compression strength of 930 MPa combined with plastic strain exceeding 25%. These findings demonstrate that the combined devitrification and consolidation of glassy precursors by spark plasma sintering is a suitable method for the production of Al-based materials characterized by high strength and considerable plastic deformation.

Production and Mechanical Properties of Nanocrystalline Intermetallics Based on TiAl3-X

2003 ◽  
Vol 791 ◽  
Author(s):  
H. A. Calderon ◽  
J. C. Aguilar-Virgen ◽  
F. Cruz-Gandarilla ◽  
M. Umemoto
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Grain Growth ◽  
High Strength ◽  
Compression Tests ◽  
Grain Sizes ◽  
Intermetallic Materials ◽  
Plasma Sintering ◽  
Average Grain Size ◽  
Spark Plasma

ABSTRACTProduction of intermetallic materials in the system TiAl3-X (X = Cr, Mn, Fe) has been achieved by means of mechanical milling and sintering techniques. Spark plasma sintering is used since it reduces time at high temperature and inhibits grain growth. The produced materials have grain sizes in the nano and microscale depending on the material and processing variables. The TiAl3-X alloys are formed mostly by the cubic L12 phase. The average grain size ranges between 30 and 50 nm in the as sintered condition. Aging at elevated temperature has been used to promote grain growth. Compression tests have been performed to evaluate mechanical properties as a function of temperature and grain size. In all cases yield stresses higher that 700 MPa are obtained together with a ductility that depends upon temperature and grain size. No ductility is found for the smallest grains sizes tested (30 nm) at room temperature. Above 673 K, these materials show ductility and additionally they present a quasi superplastic behavior at temperatures higher that 973 K. On the other hand ductility can also be developed in the TiAl3-X alloys by inducing grain growth via annealing. Alloys with grains sizes around 500 nm show high ductility and a large density of microcraks after deformation suggesting that the yield strenght becomes lower than the stress to propagate the cracks. In such materials, a considerably high strength is retained up to 873 K.

Fabrication and Mechanical Properties of ultra fine WC-6wt.%Co by Spark Plasma Sintering Process

2011 ◽  
Vol 49 (01) ◽  
pp. 40-45 ◽  
Author(s):  
Hyun-Kuk Park ◽  
Seung-Min Lee ◽  
Hee-Jun Youn ◽  
Ki-Sang Bang ◽  
Ik-Hyun Oh
Keyword(s):  
Mechanical Properties ◽  
Spark Plasma Sintering ◽  
Sintering Process ◽  
Plasma Sintering ◽  
Spark Plasma
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