scholarly journals Synthesis of Ti2SnC under Optimized Experimental Parameters of Pressureless Spark Plasma Sintering Assisted by Al Addition

2018 ◽  
Vol 2018 ◽  
pp. 1-9
Author(s):  
Chen Lu ◽  
Yue Wang ◽  
Xiaofan Wang ◽  
Jianfeng Zhang
Keyword(s):  
Sintering Temperature ◽  
Molar Ratio ◽  
Mechanism Analysis ◽  
Fast Heating ◽  
Sintering Aid ◽  
Sintering Time ◽  
Plasma Sintering ◽  
Experimental Parameters ◽  
Spark Plasma ◽  
Rapid Sintering

As an effective and novel rapid sintering technology with the advantages of fast heating speed and short sintering time, SPS has been applied to the research and development of various materials. After sintering at 1325°C, Ti5Sn3and Sn occurred as impurities accompanying the synthesis of Ti2SnC with a raw powder mixture of Ti/Sn/C = 2/1/1 (molar ratio). But by addition of 0.2 molar Al, and further optimization of sintering parameters at 1400°C for 10 min, almost fully pure Ti2SnC was obtained with a clear layered microstructure. The reaction mechanism analysis suggests that this beneficial effect of Al could be attributed to the suppression of decomposition of Ti2SnC by formation of Ti2SnxAl1−xC solid solution at a high sintering temperature. The present study reports a novel route to synthesize Ti2SnC by PL-SPS with a self-designed graphite die, and Al was also proposed as a sintering aid to remove impurities.

Discharge Enhancement Effect of Inorganic Nanometer Spark Plasma Sintering Aid

2016 ◽  
Vol 850 ◽  
pp. 829-834
Author(s):  
Hao Feng Li ◽  
Ming Gang Wang ◽  
Zhan Kui Zhao
Keyword(s):  
Spark Plasma Sintering ◽  
Sintering Temperature ◽  
Physical Method ◽  
Silicon Steel ◽  
Enhancement Effect ◽  
Gas Atomization ◽  
Sintering Aid ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Powder Particles

CaF2 inorganic nanometer powder particles were used as sintering aid to sintering good conductive Fe-6.5Si alloy. By a physical method, CaF2 inorganic nanopowder particles were made with a granularity of 15-30 nm assembled between micron-sized Fe-6.5Si powder particles prepared by gas atomization. 6.5 % Si high silicon steel were fabricated by spark plasma sintering (SPS) with varying contents of CaF2. The discharge enhancement effect of CaF2 inorganic nanospark plasma aid is confirmed. The initial sintering temperature and the final sintering temperature were decreased by 75 °C and 70 °C respectively with 0.5 % CaF2 inorganic nanopowder aid. In the case of reduced 60 °C, the higher density for the particles with the addition of CaF2 was observed compared with without CaF2. When the nanopowder was 2%, sintering performance decreased. The study indicates that sintering pressure has an enormous effect on the Fe-6.5Si sintering effect.

Spark plasma sintering and characterization of bulk nanostructured fully stabilized zirconia: Part I. Densification studies

2004 ◽  
Vol 19 (11) ◽  
pp. 3255-3262 ◽  
Author(s):  
U. Anselmi-Tamburini ◽  
J.E. Garay ◽  
Z.A. Munir ◽  
A. Tacca ◽  
F. Maglia ◽  
...  
Keyword(s):  
Crystallite Size ◽  
Heating Rate ◽  
Spark Plasma Sintering ◽  
Significant Influence ◽  
Sintering Temperature ◽  
Stabilized Zirconia ◽  
Sintering Time ◽  
Final Density ◽  
Plasma Sintering ◽  
Spark Plasma

The sintering of nanosize powders of fully stabilized zirconia was investigated using the spark plasma sintering (SPS) method. The influence of sintering temperature, heating rate, direct current pulse pattern, sintering time, and sintering pressure on the final density and grain size of the product was investigated. The dependence of densification on temperature showed a maximum at 1200 °C, resulting with nearly fully dense zirconia with a crystallite size of about 100 nm. Heating rate (50∼300 °C min−1) and sintering time (5–16 min) had no significant influence on the final density and the crystallite size. Pulsing patterns ranging from 2:2 to 48:2 (on:off) had no influence on the density or the crystallite size. However, the applied pressure had a significant influence on the final density but no apparent effect on crystallite size for a sintering temperature of 1200 °C and a hold time of 5 min.

Fabrication and Electrical Property of SiC-AlN Composites

2007 ◽  
Vol 561-565 ◽  
pp. 607-611 ◽  
Author(s):  
Junichi Hojo ◽  
Yuki Nonaka ◽  
Kai Kamada ◽  
Naoya Enomoto ◽  
Mikinori Hotta ◽  
...  
Keyword(s):  
Solid Solution ◽  
Electrical Conductivity ◽  
Grain Size ◽  
Electrical Property ◽  
Sintering Temperature ◽  
Molar Ratio ◽  
Sintering Process ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Wide Compositional Range

SiC and AlN form a solid solution in the wide compositional range, expectantly leading to control of the semiconductive property. In the present work, the SiC-AlN composites were fabricated by sintering process, and evaluated with emphasis on the distribution of SiC and AlN and electrical property. SiC and AlN powders were mixed at a molar ratio between 90:10 and 10:90, and sintered at 1900-2100 °C for 30 min under 50 MPa in Ar atmosphere by spark plasma sintering technique. The sintered bodies reached high densities over 95 % of theoretical, and the grain size increased with an increase in the sintering temperature and the AlN content. The SiC-AlN composites had 3C and 2H phases in SiC-rich composition, while 2H phase only in AlN-rich composition, and the mutual dissolution between SiC and AlN was enhanced at high temperatures. The electrical conductivity decreased with dissolution of AlN into SiC because of the increase in band gap.

Effects of Al, B and C Additives on Microstructure and Mechanical Properties of Spark-Plasma-Sintered SiC Ceramics

2005 ◽  
Vol 287 ◽  
pp. 329-334 ◽  
Author(s):  
Kyeong Sik Cho ◽  
Kwang Soon Lee
Keyword(s):  
Mechanical Properties ◽  
Heating Rate ◽  
Sintering Temperature ◽  
Applied Pressure ◽  
Fast Heating ◽  
Soaking Time ◽  
Sic Ceramics ◽  
Prolonged Annealing ◽  
Plasma Sintering ◽  
Spark Plasma

Densification of the SiC powder without and with additives B+C or Al+B+C was carried out by spark plasma sintering (SPS). The unique features of the process are the possibilities of using a very fast heating rate and a short holding time to obtain fully dense materials. The heating rate and applied pressure were kept at 100°C/ min and 40 MPa, while the sintering temperature and soaking time varied from 1650-1850°C for 10-40 min, respectively. The SPS-sintered specimens with the addition of B+C or Al+B+C at 1850°C reached near-theoretical density. The 3C major crystalline phase of SiC was transformed to 6H at 1800°C and translated to 4H during prolonged annealing at 1850°C. The strength of 531.0 MPa and the fracture toughness of 3.9 MPa·m1/2 were obtained by the addition of Al+B+C to SiC prepared at 1850°C for 10 min.

Research on Two Sintered Techniques of Nanometer WC-Co Powder

2007 ◽  
Vol 534-536 ◽  
pp. 593-596 ◽  
Author(s):  
Lan Sun ◽  
Cheng Chang Jia ◽  
Hua Tang
Keyword(s):  
Grain Size ◽  
Grain Growth ◽  
Spark Plasma Sintering ◽  
Hot Pressing ◽  
Sintering Temperature ◽  
Grain Sizes ◽  
Sintering Time ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Hot Pressing Sintering

This paper concerned with SPS (spark plasma sintering), hot pressing of sinter nanometer WC-Co powder and discussed the density, hardness, microstructures and grain sizes of the alloys sintered by different styles. The results showed that SPS could lower the sintering temperature, increased the density and circumscribed the growth of grain size of WC. Hot pressing sintering could produce high density alloys and play well on the grain growth, but its sintering temperature and sintering time were larger than SPS. Besides, the hardness of the sintered cemented alloys that was dependent on the grain size and densification could also be improved by SPS and hot pressing.

Effect of spark plasma sintering temperature on structure and phase composition of Ti-Al-Nb-based alloys

2017 ◽  
Vol 59 (11-12) ◽  
pp. 1033-1036 ◽  
Author(s):  
Sherzod Kurbanbekov ◽  
Mazhyn Skakov ◽  
Viktor Baklanov ◽  
Batyrzhan Karakozov
Keyword(s):  
Phase Composition ◽  
Spark Plasma Sintering ◽  
Sintering Temperature ◽  
Plasma Sintering ◽  
Spark Plasma

scholarly journals Rapid sintering of anisotropic, nanograined Nd–Fe–B by flash-spark plasma sintering

2016 ◽  
Vol 417 ◽  
pp. 279-283 ◽  
Author(s):  
Elinor Castle ◽  
Richard Sheridan ◽  
Salvatore Grasso ◽  
Allan Walton ◽  
Mike Reece
Keyword(s):  
Spark Plasma Sintering ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Rapid Sintering

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.

Sign in / Sign up

Export Citation Format

Share Document