scholarly journals Microstructural Properties of Nb-Si Based Alloys Manufactured by Powder Metallurgy

2011 ◽  
Vol 278 ◽  
pp. 533-538 ◽  
Author(s):  
Stefan Drawin ◽  
J.P. Monchoux ◽  
J.L. Raviart ◽  
Alain Couret
Keyword(s):  
Heat Treatment ◽  
Powder Metallurgy ◽  
Spark Plasma Sintering ◽  
Hot Extrusion ◽  
Conventional Technique ◽  
Subsequent Heat Treatment ◽  
Microstructural Properties ◽  
Niobium Silicide ◽  
Plasma Sintering ◽  
Spark Plasma

An NbTiHfCrAlSi niobium silicide based atomized powder has been compacted by a conventional technique (hot extrusion) and by spark plasma sintering to nearly fully dense alloys. Both materials exhibit a metastable fine micrometer-sized microstructure that has been coarsened by a subsequent heat treatment. The densification of the SPS sample takes place between ca. 800°C and 1300°C.

scholarly journals Mechanical properties of phase-pure bulk Ta4AlC3 prepared by spark plasma sintering and subsequent heat treatment

2021 ◽  
Vol 15 (3) ◽  
pp. 211-218
Author(s):  
Guobing Ying ◽  
Cong Hu ◽  
Lu Liu ◽  
Cheng Sun ◽  
Dong Wen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Fracture Toughness ◽  
Flexural Strength ◽  
Spark Plasma Sintering ◽  
Treatment Time ◽  
Raw Materials ◽  
Subsequent Heat Treatment ◽  
Plasma Sintering ◽  
Spark Plasma

High-purity and bulk Ta4AlC3 ceramics were successfully fabricated by spark plasma sintering (SPS) and subsequent heat treatment, using the raw materials including TaC and Ta2AlC powders. These raw materials were first synthesized by self-propagation high temperature synthesis from elements tantalum, aluminium and carbon black powders, followed by pressure-less sintering. The as-fabricated bulk Ta4AlC3 was relatively stable when subjected to heat treatment at elevated temperature of 1500?C. Moreover, prolonging the heat treatment time resulted in bigger grain sizes and higher densities of the Ta4AlC3. The flexural strength and the fracture toughness of the Ta4AlC3 fabricated by SPS were found to be 411MPa and 7.11MPa?m1/2, respectively. After the heat treatment at 1500?C for 8 h, the flexural strength and the fracture toughness of the Ta4AlC3 could reach 709MPa and 9.23MPa?m1/2, respectively. The special structural characteristics of the ternary ceramics and the increase of density after the heat treatment are the main reasons for the variation in mechanical properties of ternary ceramics.

Effect of Spark Plasma Sintering on the Microstructure Evolution and Properties of M3:2 High-Speed Steel

2014 ◽  
Vol 788 ◽  
pp. 329-333
Author(s):  
Rui Zhou ◽  
Xiao Gang Diao ◽  
Jun Chen ◽  
Xiao Nan Du ◽  
Guo Ding Yuan ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Spark Plasma Sintering ◽  
High Speed ◽  
Bending Strength ◽  
Sintering Temperature ◽  
High Speed Steel ◽  
Continuous Heating ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
The Impact

Effects of sintering temperatures on the microstructure and mechanical performance of SPS M3:2 high speed steel prepared by spark plasma sintering was studied. High speed steel sintering curve of continuous heating from ambient temperature to 1200°C was estimated to analyze the sintering processes and sintering temperature range. The sintering temperature within this range was divided into groups to investigate hardness, relative density and microstructure of M3:2 high-speed steel. Strip and quadrate carbides were observed inside the equiaxed grains. SPS sintering temperature at 900°C can lead to nearly full densification with grain size smaller than 20μm. The hardness and bending strength are higher than that of the conventionally powder metallurgy fabricated ones sintered at 1270°C. However, fracture toughness of the high speed steel is lower than that of the conventional powder metallurgy steels. This can be attributed to the shape and distribution of M6C carbides which reduce the impact toughness of high speed steels.

Sintering Behavior of TiC-Fe Based Composite Fabricated by Spark Plasma Sintering Using TiH2 Graphite Powders

2007 ◽  
Vol 534-536 ◽  
pp. 217-220 ◽  
Author(s):  
Sung Yeal Bae ◽  
In Sup Ahn ◽  
Ho Jung Cho ◽  
Chul Jin Kim ◽  
Dong Kyu Park
Keyword(s):  
Heat Treatment ◽  
Spark Plasma Sintering ◽  
Temperature Increase ◽  
Metal Matrix ◽  
Sintering Behavior ◽  
Matrix Composites ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Particulate Reinforced ◽  
Continuous Metal

TiC particulate reinforced Fe matrix composite compacts with controlled interfacial reaction was processed by spark plasma sintering after mechanical alloying. Milled powders were fabricated for 1-5 hours by spex shaker mill with the ball to powder ratio of 25:2. Metal matrix composites (MMCs) based on the Fe-40%TiC system can be synthesized by spark plasma sintering of the D’AE powders with TiH2-graphite powders under vacuum in the temperature range 1273-1473K for 5-20 min. TiC phase was formed by self combustion reaction with temperature increase. The specimen that was formed by sintering Fe-TiC powders displayed a microstructure of uniformly dispersed TiC grain in a continuous metal matrix. The densifications of the TiC-Fe materials were increased as the heat-treatment holding time increasing. In the same time, relative density and hardness of TiC-Fe sintering materials was increased.

scholarly journals The effect of heat treatment on α/ β phases evolution of TC4 titanium alloy fabricated by spark plasma sintering

2020 ◽  
Vol 50 ◽  
pp. 713-718
Author(s):  
Kaihua Xu ◽  
Yong Xue ◽  
Zhimin Zhang ◽  
Qiang Wang ◽  
Jiangpeng Yan ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Titanium Alloy ◽  
Spark Plasma Sintering ◽  
Tc4 Titanium Alloy ◽  
Plasma Sintering ◽  
Spark Plasma
Sign in / Sign up

Export Citation Format

Share Document