Sintering temperature-microstructure-property relationships of alumina matrix composites with silicon carbide and silica additives

2017 ◽  
Vol 24 (4) ◽  
pp. 495-500 ◽  
Author(s):  
Apichart Limpichaipanit ◽  
Sukanda Jiansirisomboon ◽  
Tawee Tunkasiri
Keyword(s):  
Fracture Toughness ◽  
Silicon Carbide ◽  
Grain Size ◽  
Fracture Surface ◽  
Sintering Temperature ◽  
Matrix Composites ◽  
Reaction Sintering ◽  
Alumina Matrix ◽  
Powder Mixtures ◽  
Ceramic Samples

AbstractAlumina-based composites were fabricated by reaction sintering from two different sintering powder mixtures: alumina with silica (SiO2) and alumina with silicon carbide (SiC; to allow oxidation to form SiO2). After sintering, SiO2 underwent complete reaction to form alumina/mullite composites. In terms of microstructure, the density and grain size of ceramic samples were investigated. The density of the composites prepared by alumina and SiC was lower than those of alumina and the composites prepared by alumina and SiO2. The grain size increased as the sintering temperature increased. In terms of mechanical properties, fracture surfaces, hardness, and fracture toughness were investigated. It was found that the fracture surface of alumina was rather intergranular, whereas the fracture surface of the composites was more transgranular. The hardness of the composites was higher than that of alumina at the same sintering temperature. However, the fracture toughness of the composites was not significantly different compared to that of alumina.

Preparation of W-C-B Composites by Reactive Resistance-Heated Hot Pressing

2004 ◽  
Vol 449-452 ◽  
pp. 309-312 ◽  
Author(s):  
S. Sugiyama ◽  
H. Taimatsu
Keyword(s):  
Fracture Toughness ◽  
Grain Size ◽  
Young’S Modulus ◽  
Hot Pressing ◽  
Young's Modulus ◽  
Reaction Sintering ◽  
Powder Mixtures

Dense WC-base W-C-B composites were prepared by the reaction sintering of B4C-WWC (mole ratio 1 : x : 80 or 130, x = 1-9) powder mixtures using resistance-heated hot pressing. Sintered bodies were composed of different products depending on x both in B4C-xW-80WC and - 130WC: WC + WB when x ≤ 3, WC + W2B + WB when x = 5, and WC + W2B + W2C when x ≥7. They had the highest Young's modulus values 706 and 705 GPa for -80WC and -130WC at x = 3, respectively. The hardness was increased with x, depending on a decrease in the grain size of WC. Its highest value was 24.5 GPa both for -80WC and -130WC at x = 9. For the fracture toughness, the highest value 6.1 MPa m1/2 was obtained for -130WC at x = 5.

Reaction Sintering of Transparent Aluminum Oxynitride (AlON) Ceramics Using MgO and Y2O3 as Co-Additives

2016 ◽  
Vol 697 ◽  
pp. 7-11 ◽  
Author(s):  
Shen Qi ◽  
Xiao Jian Mao ◽  
Bao Yan Chai ◽  
Long Zhang
Keyword(s):  
Grain Size ◽  
Optical Properties ◽  
Liquid Phase ◽  
Aluminum Nitride ◽  
Sintering Temperature ◽  
Direct Reaction ◽  
Reaction Sintering ◽  
Aluminum Oxynitride ◽  
Sintering Additives

Transparent aluminum oxynitride (AlON) ceramics have been prepared through a method based on direct reaction sintering of alumina and aluminum nitride powders using MgO and Y2O3 as co-additives. The sintering additives could cause the formation of liquid phase during sintering, which would greatly promote the densification and eliminate pores. The grain size of AlON is about 50-100μm. The influence of different component of Al2O3 and AlN as well as sintering temperature on microstructure and optical properties of AlON have been studied. High transparent AlON ceramics with the in-line transmittance of 80.3% at 2000 nm wavelength have been prepared when the concentration of sintering additives was 0.16wt% Y2O3 and 0.02wt% MgO.

Influences of Thermal Molding Process on the Flexural Properties of SiC/SiC Composites with a New Precursor Polymer

2015 ◽  
Vol 816 ◽  
pp. 33-39
Author(s):  
Zheng Luo ◽  
Xin Gui Zhou ◽  
Jin Shan Yu ◽  
Fei Wang
Keyword(s):  
Fracture Toughness ◽  
Silicon Carbide ◽  
Molding Pressure ◽  
Flexural Properties ◽  
Cross Linking ◽  
Matrix Composites ◽  
Molding Process ◽  
Sic Fiber ◽  
Precursor Polymer ◽  
Sic Composites

Silicon carbide (SiC) fiber reinforced SiC matrix composites (SiC/SiC) were fabricated by precursor impregnation and pyrolysis (PIP) process with a new precursor polymer, liquid polyvinylcarbosilane (LPVCS). The molding process was conducted during the cross-linking reactions of LPVCS for the first PIP cycle. The influences of molding pressure and molding time on the flexure properties of the SiC/SiC composites were studied. The results indicated that the optimal molding pressure and molding time were 3MPa and 5h respectively due to the fine interfacial bonding between fiber and matrix. The density of the SiC/SiC composites was 2.16g/cm3. The flexural strength and fracture toughness of the SiC/SiC composites were 637.5MPa and 29.8MPa·m1/2 respectively.

Microstructure and Mechanical Properties of TiC/Ti3AlC2 In Situ Composites Prepared by Hot Pressing Method

2015 ◽  
Vol 816 ◽  
pp. 200-204 ◽  
Author(s):  
Miao Miao Ruan ◽  
Xiao Ming Feng ◽  
Tao Tao Ai ◽  
Ning Yu ◽  
Kui Hua
Keyword(s):  
Fracture Toughness ◽  
Flexural Strength ◽  
Vickers Hardness ◽  
Hot Pressing ◽  
Sintering Temperature ◽  
Powder Mixtures ◽  
Pressing Method ◽  
Hot Pressing Sintering ◽  
Sintering Method

TiC/Ti3AlC2 composites were successfully prepared by hot-pressing sintering method from the elemental powder mixtures of Ti, Al and TiC. A possible reaction mechanism was investigated by XRD. The density, Vickers hardness, flexural strength, and fracture toughness of the TiC/Ti3AlC2 composites were also measured. At 660 °C, Al melted and reacted with Ti to form TiAl3. At 900 °C, TiAl3 reacted with TiC and Ti to form Ti2AlC. At 1100 °C, Ti2AlC reacted with TiC to form Ti3AlC2. Increasing the sintering temperature, the content of Ti3AlC2 increased. The TiC/Ti3AlC2 composites had excellent performance after sintered at 1100 °C, the density, Vickers hardness, flexural strength and fracture toughness of the composite were 4.35 g/cm3, 4.72 GPa, 566 MPa and 6.18 MPa·m1/2, respectively.

Improvement of flexure strength and fracture toughness in alumina matrix composites reinforced with carbon nanotubes

2009 ◽  
Vol 517 (1-2) ◽  
pp. 293-299 ◽  
Author(s):  
Sung Wan Kim ◽  
Won Sub Chung ◽  
Kee-Sun Sohn ◽  
Chang-Young Son ◽  
Sunghak Lee
Keyword(s):  
Carbon Nanotubes ◽  
Fracture Toughness ◽  
Matrix Composites ◽  
Alumina Matrix ◽  
Flexure Strength

scholarly journals Taguchi’s method of optimization of fracture toughness parameters of Al-SiCp composite using compact tension specimens

2021 ◽  
Vol 11 (2) ◽  
pp. 152-157
Author(s):  
Hareesha Guddhur ◽  
Chikkanna Naganna ◽  
Saleemsab Doddamani
Keyword(s):  
Fracture Toughness ◽  
Silicon Carbide ◽  
Grain Size ◽  
Process Parameters ◽  
Particulate Composite ◽  
Compact Tension ◽  
Stir Casting ◽  
Casting Technique ◽  
Silicon Carbide Particulate ◽  
Taguchi’S Design Of Experiments

The objective of this work is to investigate the process parameters which influence the fracture toughness of aluminum-silicon carbide particulate composite prepared using the stir casting technique. The Taguchi’s design of experiments is conducted to analyze the process parameters. Three parameters considered are composition of material, grain size and a/W ratio. From the Taguchi’s analysis, on compact tension specimens, aluminum 6061 reinforced with 9 wt% of the silicon carbide particles composite and a/W ratio of 0.45 are considered to be optimized parameters. Taguchi's technique result shows that the increment in the a/W ratio causes decrement in the load carrying capacity of the composite. Whereas the fine grain size of silicon carbide have better toughness values. From the ANOVA outcomes it is clear that the composition and a/W ratio of the geometry has more influence on the fracture toughness than the grain size of reinforcement.

scholarly journals Influence of the sintering temperature on the microstructure, mechanical properties and densification characteristics of (TiB+TiC)/TC4 composite

2021 ◽  
Author(s):  
Zheng-Yang Hu ◽  
Hai-Chun Peng ◽  
Zhao-Hui Zhang ◽  
Peng Song ◽  
Ming Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Tensile Strength ◽  
Sintering Temperature ◽  
Matrix Composites ◽  
Densification Process ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
B4c Powder

Abstract A hybrid of TiB whiskers and TiC particles reinforced TC4 matrix composites were in-situ synthesized by spark plasma sintering (SPS) using a TC4-0.6wt.% B4C powder mixture at temperatures range from 550°C to 1150°C. The effect of sintering temperature on microstructure, grain size, mechanical properties and densification process of the (TiB+TiC)/ TC4 matrix composites were investigated. The composite sintered at 1050℃ has the highest tensile strength (1129.0 MPa), yield strength (1077.8MPa) and plasticity (7.1%). The aspect ratio of TiB whiskers increases almost linearly below 1050°C and its highest value is 33.2. The grain size of TiC increases with the increase of sintering temperature, and rapid growth occurs in the range of 850°C to 950°C. The composite sintered body appears four shrinkage stages before applying sintering pressure. The corresponding peak temperatures are 663℃, 758℃, 840℃ and 994℃, respectively.

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