Interface and mechanical behavior of MoSi2-based composites

MoSi2-based composites reinforced with particles, whiskers, and continuous fibers were fabricated using hot pressing and hot isostatic pressing techniques. The microstructure, interface compatability, and interfacial properties between the reinforcements and matrix are discussed. The microstructural parameters which control the mechanical behavior of the MoSi2 composites were characterized. The need for developing a satisfactory reinforced MoSi2 composite for high-temperature structural applications is also addressed.

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Powder Processing of High Temperature Aluminides

MRS Proceedings ◽

10.1557/proc-133-403 ◽

1988 ◽

Vol 133 ◽

Cited By ~ 7

Author(s):

R. M. German ◽

A. Bose ◽

N. S. Stoloff

Keyword(s):

High Temperature ◽

Hot Pressing ◽

Powder Processing ◽

Hot Isostatic Pressing ◽

Reactive Sintering ◽

Isostatic Pressing ◽

Active Research ◽

Processing Techniques

ABSTRACTThis paper reviews the several powder processing techniques that have been applied to the fabrication of both monolithic aluminides and their composites. Attention is given to the active research at Rensselaer on reactive sintering and reactive hot isostatic pressing of elemental powders, hot pressing of prealloyed powders, and molding of powder-fiber-binder slurries. The application of one or more of these techniques to the following monolithic intermetallics is described: NiAl, Ni3Al, TiAl, NbAl3, Ta2Al, and TaAl3. Progress has occurred in fabrication of dense compacts, including some composites, from these aluminides.

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Hot Isostatic Pressing of High Temperature Superconducting Ceramics

Materials Technology ◽

10.1080/10667857.1994.11785072 ◽

1994 ◽

Vol 9 (9-10) ◽

pp. 211-215

Author(s):

John Niska ◽

Bengt Loberg

Keyword(s):

High Temperature ◽

Hot Isostatic Pressing ◽

Isostatic Pressing ◽

High Temperature Superconducting ◽

Superconducting Ceramics

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Superhard TiB2 - Based Composites with Different Matrix Fabricated from Elemental Powders by SHS-p-HIP

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.77.146 ◽

2012 ◽

Vol 77 ◽

pp. 146-152 ◽

Cited By ~ 7

Author(s):

Marta Ziemnicka-Sylwester

Keyword(s):

High Temperature ◽

Hot Isostatic Pressing ◽

Cutting Tools ◽

Consolidation Process ◽

Pressing Method ◽

High Temperature Synthesis ◽

Structural Applications ◽

Improve Fracture Toughness ◽

Ball Milling Technique ◽

Main Component

TiB2is a superhard, high-temperature and high corrosion resistant material and it is under consideration for tungsten-free cutting tools and high temperature structural applications. Although such a covalent compound requires significantly elevated temperature for the consolidation, great exothermicity of TiB2synthesis by means of SHS (Self-propagating High-temperature Synthesis) can be “ïn situ” utilized. In this study, TiB2-based composites are fabricated from titanium, boron and binder metal. In order to optimize consolidation process and improve fracture toughness of the products, three types of binder, based on cobalt, nickel or copper were investigated. In respect to hardness, limited amount of binder, 5, 10 or 15 vol.% respectively, were applied; each time 5 vol.% of Ti addition for reaction with boron completeness was used. The TiB2based composites were fabricated from elements in one process by means of the SHS process combined with p-HIP (pseudo-hot isostatic pressing) method. The raw elemental powders were homogenized by wet mixing using ball milling technique. Dried mixtures were pressed into a compact, coiled by heating element and then exposed to the SHS-p-HIP process. After SHS initiation, the compact was pressed pseudo-isostatically under pressure of 190MPa for 5 min. The sintering additives and their concentrations significantly affected the consolidation process as well as the properties of composites. The highest hardness was obtained for samples sintered with cobalt, containing intermetallic binder. However, elemental metal binder was detected as a main component for samples sintered with copper. The relative density, SEM microstructure, phase composition and hardness are compared in this study.

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Mechanical Behavior of 2D C/SiC Composites at Elevated Temperatures under Uniaxial Compression

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.462-463.1 ◽

2011 ◽

Vol 462-463 ◽

pp. 1-6 ◽

Cited By ~ 1

Author(s):

Tao Suo ◽

Yu Long Li ◽

Ming Shuang Liu

Keyword(s):

Compressive Strength ◽

High Temperature ◽

Carbon Fiber ◽

Mechanical Behavior ◽

Uniaxial Compression ◽

Room Temperature ◽

Elevated Temperatures ◽

Carbon Matrix ◽

Structural Applications ◽

Sic Composites

As Carbon-fiber-reinforced SiC-matrix (C/SiC) composites are widely used in high-temperature structural applications, its mechanical behavior at high temperature is important for the reliability of structures. In this paper, mechanical behavior of a kind of 2D C/SiC composite was investigated at temperatures ranging from room temperature (20C) to 600C under quasi-static and dynamic uniaxial compression. The results show the composite has excellent high temperature mechanical properties at the tested temperature range. Catastrophic brittle failure is not observed for the specimens tested at different strain rates. The compressive strength of the composite deceases only 10% at 600C if compared with that at room temperature. It is proposed that the decrease of compressive strength of the 2D C/SiC composite at high temperature is influenced mainly by release of thermal residual stresses in the reinforced carbon fiber and silicon carbon matrix and oxidation of the composite in high temperature atmosphere.

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