Mechanical Properties of Aluminum-Graphite Composites Prepared by Liquid Phase Hot Pressing

SiC/SiC composites were fabricated by hot pressing (HP) via liquid phase sintering (LPS) using carbon coated 2D woven Tyranno SA fabrics as reinforcement. Both nano-SiC and micro-SiC powders with sintering additives were used for matrix. The effects of preparation conditions on the microstructure and mechanical properties of the composites were characterized. Highly densified composite was obtained at 1780°C under 20MPa with nano-SiC particles. The strength and elastic modulus of the composite were enhanced. When micro-SiC powder was used, higher strength revealed for the composite sintered at 1780°C under 15MPa, although it was not densified enough. Higher sintering temperature (1800°C) is beneficial for the densification of the composite, but is not obvious for the improvement of mechanical properties.

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Reaction Synthesis and Mechanical Properties of B4C-Based Ceramic Composites

Materials Science Forum ◽

10.4028/www.scientific.net/msf.534-536.917 ◽

2007 ◽

Vol 534-536 ◽

pp. 917-920 ◽

Cited By ~ 1

Author(s):

Jae Ho Han ◽

Sang Whan Park ◽

Young Do Kim

Keyword(s):

Mechanical Properties ◽

Hot Pressing ◽

Sintering Temperature ◽

Ceramic Composites ◽

Industrial Applications ◽

Hard Material ◽

High Relative Density ◽

Graphite Composites ◽

Very High

Boron carbide is a very hard material with high abrasive wear resistance. It requires a very high sintering temperature of above 2200 oC to fabricate a monolithic B4C close to the theoretical density. However, the mechanical property of monolithic B4C is not good enough to use it directly to industrial applications. In this investigation, B4C based ceramic composites were fabricated by in-situ reaction hot pressing using B4C, TiC and SiC powder as starting materials. The reaction synthesized composites by hot pressing at 1950 oC was found to posses very high relative density. The reaction synthesized B4C composites comprise B4C, TiB2, SiC and graphite by the reaction between TiC and B4C. The newly formed TiB2 and graphite was embedded both inside grain and at grain boundary of B4C. The mechanical properties of reaction synthesized B4C-TiB2- SiC-graphite composites were more enhanced compared to those of monolithic B4C. The flexural strength and fracture toughness of these in-situ B4C synthesized composites were 400-570 MPa and 6-9.5 MPam1/2, respectively.

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Effects of temperature field and SiC nanoparticles on microstructure and mechanical properties of n-SiCp/Mg-9% Al composites fabricated by ultrasonication-assisted semi-solid hot pressing of powder

International Journal of Materials Research (formerly Zeitschrift fuer Metallkunde) ◽

10.3139/146.111743 ◽

2019 ◽

Author(s):

Ming Li ◽

Zhiwei Huang ◽

Gaozhan Zhao ◽

Hongxia Wang ◽

Jianquan Tao ◽

...

Keyword(s):

Mechanical Properties ◽

Temperature Field ◽

Hot Pressing ◽

Sic Nanoparticles ◽

Microstructure And Mechanical Properties ◽

Effects Of Temperature ◽

Semi Solid

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Effect of nickel on formation of transition layer during liquid-phase aluminizing of titanium

10.36652/1813-1336-2020-16-7-313-317 ◽

2020 ◽

pp. 313-317

Author(s):

A.I. Kovtunov ◽

Yu.Yu. Khokhlov ◽

S.V. Myamin

Keyword(s):

Mechanical Properties ◽

Liquid Phase ◽

Intermetallic Layer ◽

Reaction Diffusion ◽

Strength Properties ◽

Effect Of Temperature ◽

Nickel Concentration ◽

Aluminum Melt ◽

Titanium Aluminum ◽

Titanium Foam

Titanium—aluminum, titanium—foam aluminum composites and bimetals obtained by liquid-phase methods, are increasingly used in industry. At the liquid-phase methods as result of the reaction diffusion of titanium and aluminum is formed transitional intermetallic layer at the phase boundary of the composite, which reduces the mechanical properties of titanium and composite. To reduce the growth rate of the intermetallic layer between the layers of the composite and increase its mechanical properties, it is proposed to alloy aluminum melt with nickel. The studies of the interaction of titanium and molten aluminum alloyed with nickel made it possible to establish the effect of temperature and aluminizing time on the thickness, chemical and phase compositions of the transition intermetallic layer. The tests showed the effect of the temperature of the aluminum melt, the nickel concentration on the strength properties of titanium—aluminum bimetal.

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