Alumina/Glass Composites Fabricated by Melt-Infiltration of Glass into Porous Alumina

2006 ◽  
Vol 313 ◽  
pp. 129-138 ◽  
Author(s):  
Yung Jen Lin ◽  
Li Bin Chang
Keyword(s):  
Activation Energy ◽  
Flexural Strength ◽  
Vickers Microhardness ◽  
Porous Alumina ◽  
Alumina Powder ◽  
Square Root ◽  
Infiltration Process ◽  
Glass Composites ◽  
Melt Infiltration ◽  
Calcium Aluminosilicate

Alumina/glass composites were successfully fabricated by melt-infiltration of glass into porous alumina pellets. Alumina powder was first pressed uniaxially at 100MPa to form disc-shaped pellets, then, heated up to 1200°C for 2 h to form porous pellets with moderate strength for subsequent infiltration. A mixture of calcium aluminosilicate and magnesium borosilicate glass powders were melt-infiltrated into porous alumina at 1200°C ~1250°C by capillary pressure to form composites. The infiltration depths varied with the square root of infiltration time. And the activation energy of the infiltration process was estimated to be 621 KJ/mole. After complete infiltration, the composite had bulk density approaching 3.3 g/cm3 (~ 96% of theoretical density) and open porosity reaching zero, with slight expansion of 0.5% in diameter. Its flexural strength was 150MPa and its Vickers microhardness was about 1000 Kg/mm2.

Processing and Properties of SIC and SIC/SIC Composite Materials by Melt Infiltration Process

2003 ◽  
Vol 17 (08n09) ◽  
pp. 1833-1838 ◽  
Author(s):  
Sang Pill Lee ◽  
Han Ki Yoon ◽  
Joon Soo Park ◽  
Yutai Katoh ◽  
Akira Kohyama
Keyword(s):  
Composite Materials ◽  
Flexural Strength ◽  
Infiltration Process ◽  
Electron Microscopies ◽  
Sic Particles ◽  
Melt Infiltration ◽  
Matrix Morphology ◽  
Optimization Methodology ◽  
Sic Composites ◽  
Correlation Process

This paper dealt with the microstructures and the mechanical properties of monolithic SiC and SiC/SiC composite materials fabricated by the melt infiltration process. The characterization of melt infiltrated SiC and SiC/SiC composite materials with different sizes of starting SiC particles was investigated by means of electron microscopies, three point bending tests and single-fiber push-out tests. Based on the mechanical property-microstructure correlation, process optimization methodology also was discussed. The flexural strength of melt infiltrated SiC material strongly depended on the content of residual silicon, which associated with the preparation route of C/SiC matrix slurry such as the composition ratio of C and SiC particles and the size of raw SiC particles. MI-SiC/SiC composites represented good flexural strength, even if the instability of matrix morphology and the interfacial debonding were occurred.

scholarly journals Biomorphic Silicon Carbide from Malaysian Hardwood

2018 ◽  
Vol 7 (4.26) ◽  
pp. 257
Author(s):  
Noor Leha Abdul Rahman ◽  
Koay Mei Hyie ◽  
Anizah Kalam ◽  
Fauziah Md Yusof
Keyword(s):  
Silicon Carbide ◽  
Flexural Strength ◽  
Xrd Analysis ◽  
Inert Atmosphere ◽  
X Ray Diffraction ◽  
Infiltration Process ◽  
Silicon Melt ◽  
Melt Infiltration ◽  
Similar Density ◽  
Porous Sic

Porous silicon carbide with mimicking the original microstructure of wood are prepared by pyrolysis and subsequently impregnated with silicon by silicon melt infiltration. The infiltration process was performed at 1500 °C for 3 hours holding times in inert atmosphere. Two types of wood were used as precursor which is Kapur and dark red Meranti.The morphology of resulting porous SiC have been investigated using scanning electron microscope (SEM/EDX) and X-ray diffraction (XRD) analysis. The density of the samples was characterized by Archimedes methods. The excess of silicon was removed by etching with the mixture of hydrofluoric and nitric acid. The flexural strength was tested by the three-point flexural method at room temperature.It has been shown that the final SiC for both precursors have similar density. The existence of SiC was proved by the XRD result, whereas EDX analysis of silicon content revealed that the formation of silicon carbide in dark red Meranti is higher than that of Kapur. The flexural strength and modulus of dark red Meranti samples were much higher than those of the kapur samples because of higher formation of silicon carbide in dark red Meranti.  

A Study on Reaction Bonded Ceramics Fabricated by Silicon Infiltration to B4C Preforms

2012 ◽  
Vol 724 ◽  
pp. 343-346 ◽  
Author(s):  
Rong Zhen Liu ◽  
Qing Wen Duan ◽  
Wen Wei Gu ◽  
Hai Yun Jin ◽  
Shao Chun Xu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Flexural Strength ◽  
Theoretical Result ◽  
Boron Carbide ◽  
Theoretical Calculation ◽  
Vickers Hardness ◽  
Volume Expansion ◽  
Maximum Density ◽  
Infiltration Process

Silicon was infiltrated into B4C preforms to fabricate B4C based composites ceramics at 1600 °C under vacuum circumstance. In this paper, silicon infiltration process was discussed by theoretical calculation. The volume expansion caused by reactions between silicon and boron carbide was about 89.1% from the calculation. In our study, the maximum density of B4C preform for the infiltration of silicon was about 1.5g/cm3 which was larger than theoretical result. The results of mechanical behavior showed that B4C based composites had excellent mechanical properties with a density lower than 2.6g/cm3, Vickers-hardness of this material was 27.2GPa, and this material showed a flexural strength of 349MPa and fracture toughness of 3.8 MPa*m1/2.

Influence of B2O3 on Dielectric, Mechanical, and Thermal Properties of MgO-Al2O3-SiO2 Glass-Ceramics

2019 ◽  
Vol 821 ◽  
pp. 435-439
Author(s):  
Bo Li ◽  
Ke Jing ◽  
Hai Bo Bian
Keyword(s):  
Activation Energy ◽  
Thermal Expansion ◽  
Thermal Properties ◽  
Low Temperature ◽  
Flexural Strength ◽  
Glass Ceramic ◽  
Glass Ceramics ◽  
Mechanical And Thermal Properties ◽  
Sintering Process ◽  
Low Thermal Expansion

Low temperature sintered MgO-Al2O3-SiO2 glass-ceramic with high mechanical and low thermal expansion was prepared for package. The remarkable influence of B2O3 addition on the electrical, mechanical, and thermal properties was fully investigated. A small amount of B2O3 promoted the sintering process and improved the densification of MAS. The kinetics via Kissinger method indicated that an appropriate B2O3 content decreased the activation energy and helped the occurrence of crystallization. Due to the increase of crystallinity and indialite phase, B2O3 addition significantly enhanced flexural strength and Young’s modulus. MAS doped with 3wt% B2O3 can be sintered at 900 °C and obtained good properties: σ = 229 MPa, φ = 86 GPa, α = 1.66×10-6 /°C, εr = 5.29, and tanδ = 5.9×10-4.

Compressive mechanical properties of porous alumina powder compacts

2014 ◽  
Vol 40 (1) ◽  
pp. 2315-2322 ◽  
Author(s):  
Yoshihiro Hirata ◽  
Taro Shimonosono ◽  
Tatsuoki Sameshima ◽  
Soichiro Sameshima
Keyword(s):  
Mechanical Properties ◽  
Porous Alumina ◽  
Alumina Powder ◽  
Powder Compacts
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