scholarly journals Comparative Study of Reactive and Non-reactive Spark Plasma Sintering Routes for The Production of TaB2-TaC Composites

2021 ◽  
Author(s):  
Melis Kaplan Akarsu ◽  
Ipek Akin ◽  
Filiz Sahin ◽  
Gultekin Goller
Keyword(s):  
Spark Plasma Sintering ◽  
Oxidation Behavior ◽  
Sintering Temperature ◽  
Single Step ◽  
Reactive Sintering ◽  
Plasma Sintering ◽  
Average Grain Size ◽  
Significant Difference ◽  
Spark Plasma

Abstract The influence of two different spark plasma sintering-based processing routes (i.e., reactive SPS (RSPS) and non-reactive SPS) on the properties of TaB2-TaC composites was investigated. Ta2O5 and B4C powders were used as starting materials in the RSPS method, and synthesis and densification of TaB2-TaC composites were accomplished in a facile single step. The effect of sintering temperature and time on the microstructure and densification of the in-situ RSPS were investigated. The obtained results were compared with non-reactive spark plasma sintered TaB2-TaC composites. The highest densification (~ 99.5 %) was achieved for the TaB2-TaC composite with 6.64 vol% TaC after reactive sintering at 1550 °C under 40 MPa with a 5 min holding time. Although lower SPS temperature was used in the RSPS method, better densification and higher Vickers hardness were obtained compared to the non-reactive SPS. While platelet-shaped TaC formation was observed in both processes, the average grain size was smaller in the sample produced by the RSPS method. On the other hand, no significant difference was detected in fracture toughness and oxidation behavior of the composites produced by RSPS and non-reactive SPS.

In Situ Synthesis of Alumina Matrix Composites by Spark Plasma Sintering

2013 ◽  
Vol 750 ◽  
pp. 92-95
Author(s):  
Zhong Chun Chen ◽  
Sri Nugroho ◽  
Akira Kawasaki
Keyword(s):  
Spark Plasma Sintering ◽  
Matrix Composites ◽  
Reactive Sintering ◽  
Alumina Matrix ◽  
Grain Sizes ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Al2o3 Phase ◽  
Al2o3 Matrix

Al2O3 matrix composites reinforced with Ba-b-Al2O3 phase were synthesized through reactive sintering using Al2O3 and BaCO3 as starting powders. Dense Al2O3/Ba-b-Al2O3 composites can be obtained by spark plasma sintering from Al2O3/BaO•Al2O3 powder, which was prepared by calcining Al2O3/BaCO3 powder mixture. The Ba-b-Al2O3 reinforcing phase exhibited an elongated morphology due to preferred diffusion of Ba cations. The existence of Ba-b-Al2O3 phase as well as low sintering temperature and short holding time during reactive sintering inhibit grain growth and thus result in small grain sizes of the Al2O3 matrix.

The Cu Matrix Strengthened by TiH2–C In-Situ Synthesized via Mechanical Milling and Spark Plasma Sintering

2021 ◽  
Vol 21 (4) ◽  
pp. 2687-2691
Author(s):  
Nguyen Thi ◽  
Hoang Oanh ◽  
Nguyen Hoang Viet
Keyword(s):  
Spark Plasma Sintering ◽  
Mechanical Milling ◽  
Sintering Temperature ◽  
Annealing Treatment ◽  
High Energy ◽  
Composite Powders ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Tic Nanoparticles

The present work is focused on the fabrication and the investigation of microstructures of copperbased TiC nanocomposites produced by mechanical milling in a high energy planetary ball mill. TiH2, carbon and copper powders were used as starting materials in which In-Situ reaction between carbon and TiH2 occurs to form TiC nanoparticles. The mixture powders of Cu–TiH2–C were milled for 12 h at 450 rpm in Argon gas. Annealing treatment process at 950 °C for 2 h was applied for as-milled composite powders to enhance In-Situ reaction. The consolidation of composite powders was conducted by spark plasma sintering under uniaxial pressing of 70 MPa. Sintering procedure was done at 950 and 1000 °C for 5 min. The results indicated that as TiC nanoparticles are formed after sintering at 950 °C and the TiC particles are increased up at higher sintering temperature of 1000 °C. Fracture surface of sintered samples shows ductile mode. HR-TEM image showed the crystal size of copper was about 10 nm for sample sintered at 1000 °C. The hardness and relative density of the nanocomposites increase when increasing sintering temperature.

Microstructural Characterization of In Situ TiB Whiskers in Ti MMCs Fabricated by SPS

2007 ◽  
Vol 336-338 ◽  
pp. 1310-1312
Author(s):  
Hai Bo Feng ◽  
De Chang Jia ◽  
Yu Zhou ◽  
Qing Chang Meng
Keyword(s):  
Electron Microscopy ◽  
Spark Plasma Sintering ◽  
Sintering Temperature ◽  
Microstructural Characterization ◽  
Average Diameter ◽  
Matrix Composites ◽  
Plasma Sintering ◽  
Transmission Electron ◽  
Spark Plasma

The in situ TiB whisker reinforced titanium matrix composites were prepared by mechanical alloying followed by spark plasma sintering. X-ray diffraction, scanning electron microscopy and transmission electron microscopy were used to characterize the microstructure of the TiB whiskers. The effect of sintering temperature on morphologies of in situ TiB whiskers was evaluated. With the increase of spark plasma sintering temperature, the average diameter of in situ TiB whiskers increased. The in situ TiB whiskers exhibited a hexagonal shape with (100), (101) and (10 1 ) planes at the transverse section and a growth orientation of [010]TiB direction.

Fabrication of Y2Ti2O7 Transparent Ceramic by Spark Plasma Sintering

2021 ◽  
Vol 1035 ◽  
pp. 663-667
Author(s):  
Li Qiong An ◽  
Rong Wei Shi ◽  
Run Hua Fan ◽  
Takashi Goto
Keyword(s):  
Grain Size ◽  
Spark Plasma Sintering ◽  
Pyrochlore Structure ◽  
Transparent Ceramic ◽  
Sintered Body ◽  
Reactive Sintering ◽  
Uniform Microstructure ◽  
Plasma Sintering ◽  
Average Grain Size ◽  
Spark Plasma

Y2Ti2O7 transparent ceramic was fabricated by reactive sintering using spark plasma sintering at 1673 K for 2.7 ks. The sintered body exhibited a cubic pyrochlore structure and uniform microstructure with an average grain size of 2.9 μm. The transmittance reached 73% at a wavelength of 2000 nm after annealing at 1023 K for 21.6 ks.

Research on Binderless Tungsten Carbide Prepared by Spark Plasma Sintering

2010 ◽  
Vol 37-38 ◽  
pp. 980-984 ◽  
Author(s):  
Xiao Qiang Li ◽  
Zhang Yi Xiao ◽  
Chao Yang ◽  
Sheng Guan Qu
Keyword(s):  
Mechanical Properties ◽  
Spark Plasma Sintering ◽  
Sintering Temperature ◽  
Rupture Strength ◽  
Sintering Process ◽  
Plasma Sintering ◽  
Average Grain Size ◽  
Spark Plasma ◽  
Xrd Patterns ◽  
Average Size

Commerical pure WC powders of 0.2, 0.4, 0.8, 2.0 and 3.0 m in diameter were sintered by spark plasma sintering process at 1300 °C, respectively. By analyzing the XRD patterns of the initial powders and the microstructure of the sintered samples, it is affirmed that the powders with an average size of 0.8 m exhibits the best activity and sintering property. To optimize sintering temperature, the sintering of 0.8 m powders was carried out at 1200-1700 °C. The specimen sintered at 1300 °C has a density of 15.49 g/cm3 and an average grain size of about 0.7 m, and exhibits the most excellent mechanical properties. The corresponding Vickers hardness and transverse rupture strength are 2469 HV and 1656 MPa, respectively.

In Situ TiB Reinforced Titanium Metal Matrix Composites Prepared by Spark Plasma Sintering

2005 ◽  
Vol 502 ◽  
pp. 189-194
Author(s):  
Yu Zhou ◽  
Hai Bo Feng ◽  
De Chang Jia
Keyword(s):  
Spark Plasma Sintering ◽  
Volume Fraction ◽  
Sintering Temperature ◽  
Matrix Composites ◽  
Titanium Matrix ◽  
Cubic Lattice ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Crystallographic Planes

In situ synthesized TiB reinforced titanium matrix composites of Ti-B and Ti-TiB2 systems have been prepared by spark plasma sintering at 800-1200 °C under 20 MPa for 5 min. The effects of sintering temperature and reinforcement volume fraction on flexural strength, Young’s modulus and fracture toughness of the composites were investigated. The in situ synthesized TiB reinforcements are randomly and uniformly distributed in titanium matrix. The TiB whiskers are aligned along [010] direction, and the crystallographic planes of the TiB needles are always of the type (100), (101) and (10 1) . The parallel TiB were observed in β-Ti grains in both of the investigated composites. The in situ TiB needle is likely to grow along [010] direction which is parallel to [111] direction of cubic lattice of β-Ti phase.

scholarly journals Process Optimization of In Situ Magnetic-Anisotropy Spark Plasma Sintering of M-Type-Based Barium Hexaferrite BaFe12O19

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2650
Author(s):  
Haetham G. Mohammed ◽  
Thar Mohammed Badri Albarody ◽  
Susilawati Susilawati ◽  
Soheil Gohari ◽  
Aris Doyan ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Spark Plasma Sintering ◽  
Sintering Temperature ◽  
Barium Hexaferrite ◽  
Optimum Process ◽  
Plasma Sintering ◽  
In Series ◽  
Spark Plasma ◽  
Measure Of Performance

This paper introduces a new spark plasma sintering technique that is able to order crystalline anisotropy by in-series/in situ DC electric coupled magnetic field. The process control parameters have been investigated on the production of anisotropic BaFe12O19 magnets based on resulted remanence (Mr). Sintering holding time (H.T.), cooling rate (C.R.), pressure (P), and sintering temperature (S.T.) are optimized by Taguchi with L9 orthogonal array (OA). The remanent magnetization of nanocrystalline BaFe12O19 in parallel (Mrǁ) and perpendicular (MrꞱ) to the applied magnetic field was regarded as a measure of performance. The Taguchi study calculated optimum process parameters, which significantly improved the sintering process based on the confirmation tests of BaFe12O19 anisotropy. The magnetic properties in terms of Mrǁ and MrꞱ were greatly affected by sintering temperature and pressure according to ANOVA results. In addition, regression models were developed for predicting the Mrǁ as well as MrꞱ respectively.

Efffect of Spark Plasma Sintering Temperature on Mechanical Properties of In Situ TiB/Ti Composites

2014 ◽  
Vol 881-883 ◽  
pp. 923-926
Author(s):  
Xiang Bo Shen ◽  
Zhao Hui Zhang ◽  
Mao Sheng Cao ◽  
Fu Chi Wang
Keyword(s):  
Mechanical Properties ◽  
Yield Strength ◽  
Spark Plasma Sintering ◽  
Vickers Microhardness ◽  
Sintering Temperature ◽  
Matrix Composites ◽  
Titanium Matrix ◽  
Plasma Sintering ◽  
Spark Plasma

The in-situ synthesized TiB reinforced titanium matrix composites have been prepared by spark plasma sintering technique at 950–1250°C, using mixtures of 10wt% TiB2 and 90wt% Ti powders. The effects of the sintering temperature on the mechanical properties (Vickers microhardness, yield strength and Young`s modulus) of the composites were investigated. SEM was used to analyze the reaction process and the microstructure of the compacts synthesized at different sintering temperatures. The results indicated that the in situ synthesized TiB grow rapidly with increasing sintering temperature. The composite sintered at 1250°C have the highest relative density of 99.2%. However, the composite sintered at 950°C exhibits the best Vickers microhardness of 4.64GPa and yield strength of 989MPa, respectively.

Spark Plasma Sintering of Two Commercial Al2O3 Powders

2011 ◽  
Vol 412 ◽  
pp. 336-339 ◽  
Author(s):  
Zhen Hua Liu ◽  
Qin Ma ◽  
Jin Jun Lu
Keyword(s):  
Grain Size ◽  
Relative Density ◽  
Spark Plasma Sintering ◽  
Sintering Temperature ◽  
Plasma Sintering ◽  
Average Grain Size ◽  
Spark Plasma

Al2O3 ceramic is prepared by spark plasma sintering (SPS) using two commercial α-Al2O3 powders at elevated sintering temperature. The relative density and average grain size of the prepared Al2O3 ceramics are measured and compared. One α-Al2O3 powder has good sintering property because the relative density of the prepared α-Al2O3 ceramic is higher than 97% while another α-Al2O3 powder has poor sintering property.

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