Wetting of SiC, Si<sub>3</sub>N<sub>4</sub>, and Carbon by Si and Binary Si Alloys

Whalen, Thomas J.; Anderson, Anthony T.

doi:10.1111/j.1151-2916.1975.tb19006.x

Cited by 115 publications

(33 citation statements)

References 4 publications

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“…This is supported by previous reports of the successful densification of SiC at a relatively low sintering temperature (1850°C) with the addition of Al and B compound(s): AlB 2 C additives, 27) Al 4 C 3 B 4 CC additives 31) and Al 3 BC 3 additive. 29) Also, it is well documented that the addition of boron into the Si melt improves wetting of SiC grains 32) and activates material transport at the SiCSiC boundaries, 33), 34) resulting in enhanced necking. Thus, the SBSC ceramic with 2 wt % boron showed better strength than the SBSC ceramics with Al or no additive.…”

Section: Resultsmentioning

confidence: 99%

Effect of additive composition on porosity and flexural strength of porous self-bonded SiC ceramics

Kennedy

Lim

Kim

2010

J. Ceram. Soc. Japan

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The effect of additive incorporation in porous self-bonded SiC (SBSC) ceramics fabricated from a mixture of coarse SiC powder (³65 µm), Si and C is investigated here. Generally, it was found that the additive reduced the porosity and increased the flexural strength of the SBSC ceramic material. This was consistent with the presence of necking in the ceramic microstructure. The flexural strength of the material without additive (control sample) was ³1617 MPa and this was found to be enhanced up to ³33 MPa using 2 wt % B and ³38 MPa, using a mixture of 1 wt % Al + 1 wt % B. Thus, the porous SiC ceramic with AlB additive (typical flexural strength ³38 MPa at 42% porosity) is very promising, contrasting its mechanical properties with the cost-effectiveness of the raw materials.

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Section: Resultsmentioning

confidence: 99%

Effect of additive composition on porosity and flexural strength of porous self-bonded SiC ceramics

Kennedy

Lim

Kim

2010

J. Ceram. Soc. Japan

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“…The inclusion of ceramic fiber materials like carbon fibers as reinforcement phase in order to form a metal matrix composite leads to an increase in mechanical properties of light metals (however, strain to failure is generally decreased for MMC materials in comparison to unreinforced alloys), and furthermore, can also lead to a decrease of material density in case of carbon fibers. E. g., for Al 6Si alloy with a density of 2.7 g/cm 3 with C-fiber reinforcement of 40 vol% and a density of HT carbon fibers of 1.76 g/cm 3 , the density of the final MMC is ρ C(HT) F /Al 6Si = 2.32 g/cm 3 . Assuming a…”

Section: Why Metal Matrix Composite Materials?mentioning

confidence: 99%

“…The basic requirement to utilize the fiber properties in the composite material is a homogeneous fiber integration with optimized fiber matrix interfaces. During melt infiltration processes in fiber preforms, wettability of fibers by the melt plays a decisive role for optimized fiber incorporation [3,4]. For polymer matrix composite (PMC) materials, high fiber contents up to 60 vol% can be achieved with low fiber damage and good matrix-to-fiber adhesion, whereas liquid aluminum, silicon, magnesium or titanium melts react with carbon fiber surfaces, leading to fiber degradation and damage as well as the formation of reaction products (e. g., aluminum carbide) at the interface [5][6][7].…”

Section: Trends In Composite Materials and Their Designmentioning

confidence: 99%

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Manufacturing of Light Metal Matrix Composites by Combined Thermal Spray and Semisolid Forming Process – Summary of the Current State of Technology

Wenzelburger

Silber

Gadow

2010

KEM

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Abstract. The demand for lightweight structures in the automotive and aerospace industry increases permanently, and the importance of lightweight design principles is also increasing in other industrial branches, aiming towards improved energy efficiency and sustainability. Light metals are promising candidates to realize security relevant lightweight components because of their high specific strength; and amongst them, aluminum alloys are the most interesting materials due to their high plasticity and strain to failure, good processability, passivation in oxygen containing atmosphere, and low cost. However, for many applications, their stiffness as well as strength and fatigue behavior at elevated temperature are insufficient. Metal matrix composite (MMC) formation by integration of reinforcements in the form of continuous or discontinuous (short) fibers can yield a high increase in the alloys' specific mechanical properties at room temperature and at elevated temperature. The integration of fibers with conventional manufacturing techniques like squeeze casting, hot pressing or diffusion bonding leads to restrictions in the component's geometry. Moreover, these techniques result in elevated process costs mainly caused by long cycle times and the need of additional protective fiber coatings. In the present paper, an alternative method for the manufacturing of aluminum matrix composites is described, combining thermal spraying and semisolid forming (thixoforging) technologies for the formation of fiber prepregs and subsequent forming with simultaneous densification. Therefore, prepregs with the matrix alloy as a thick surface coating on the reinforcement fibers are manufactured in a fast, automated coating process, while reheating, densification and shaping are performed in a separate process, allowing an optimization of both processes towards cycle times and resulting material properties.Continuous fiber and short fiber reinforced aluminum matrix composites are manufactured using woven or parallel arranged continuous fibers, or short fibers as a fleece or fiber paper material. For the coating process, twin-wire electric arc spraying is applied as a well established, cost efficient thermal spray technology. The coating process is optimized towards microstructure of the matrix alloy prior to semisolid forming, which requires a globular alloy microstructure, and reduced fiber damage during the high-temperature liquid melt deposition. The thermally sprayed fine-grained matrix material enables semisolid forming at liquid contents of 40-60 vol% of the alloy, with short flow paths, reduced mechanical loads and short cycle times. Thus, limited fiber damage and residual stresses will occur, leading to good mechanical material properties. A production line for industrial-scale coating of fiber fabric coils in a continuous process is introduced in order to provide prepregs of various fiber-reinforcement materials and fiber architectures; moreover, a winding equipment for simultaneous fiber winding and coating is presented ...

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“…30-40°). [29] Representative images showing the microstructure of the fabricated Si-SiC composite are shown in Figure 4. The Si infiltration results in the formation of dense Si-SiC composites with a geometrical density of 2.6 g cm -3 .…”

mentioning

confidence: 99%

Laminated Object Manufacturing of Preceramic‐Paper‐Derived Si?SiC Composites

Windsheimer

Travitzky

Hofenauer³

et al. 2007

Advanced Materials

122

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Wetting of SiC, Si₃N₄, and Carbon by Si and Binary Si Alloys

Cited by 115 publications

References 4 publications

Effect of additive composition on porosity and flexural strength of porous self-bonded SiC ceramics

Effect of additive composition on porosity and flexural strength of porous self-bonded SiC ceramics

Manufacturing of Light Metal Matrix Composites by Combined Thermal Spray and Semisolid Forming Process – Summary of the Current State of Technology

Laminated Object Manufacturing of Preceramic‐Paper‐Derived Si?SiC Composites

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Wetting of SiC, Si3N4, and Carbon by Si and Binary Si Alloys

Cited by 115 publications

References 4 publications

Effect of additive composition on porosity and flexural strength of porous self-bonded SiC ceramics

Effect of additive composition on porosity and flexural strength of porous self-bonded SiC ceramics

Manufacturing of Light Metal Matrix Composites by Combined Thermal Spray and Semisolid Forming Process – Summary of the Current State of Technology

Laminated Object Manufacturing of Preceramic‐Paper‐Derived Si?SiC Composites

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Wetting of SiC, Si₃N₄, and Carbon by Si and Binary Si Alloys