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Author: R. Cooper Publisher: ISBN: Category : Languages : en Pages : 59
Book Description
Titanium carbide (TiC) and titanium diboride (TiB2 ceramics were formed from elemental powders using a Gleeble 1500 dynamic thermomechanical process simulator. In the first step of a two-step process, a self-propagating high-temperature synthesis (SHS) reaction was initiated by the passage of an electric current through the powdered green body. The temperature of the body was maintained at about 800 deg C, and the reaction rate was controlled by the application of a pressure of about 35 MPa. As verified by x-ray diffraction analysis, this procedure resulted in complete conversion from reactants into products having a range of densities from 72 to 75% of theoretical. In the second step, the current was increased to raise the temperature of the material, thereby sintering and densifying the product. TiC with 3 wt.% nickel (Ni) was sintered to 95 to 98% of theoretical density, while TiC without Ni was sintered to 90% theoretical density. Although TiB2 was successfully converted, efforts to fully densify the product were hindered by the limitations of the Gleeble 1500. The effects of the current and pressure levels on the product density and microstructure were examined. The advantages and limitations of this process are also discussed.
Author: R. Cooper Publisher: ISBN: Category : Languages : en Pages : 59
Book Description
Titanium carbide (TiC) and titanium diboride (TiB2 ceramics were formed from elemental powders using a Gleeble 1500 dynamic thermomechanical process simulator. In the first step of a two-step process, a self-propagating high-temperature synthesis (SHS) reaction was initiated by the passage of an electric current through the powdered green body. The temperature of the body was maintained at about 800 deg C, and the reaction rate was controlled by the application of a pressure of about 35 MPa. As verified by x-ray diffraction analysis, this procedure resulted in complete conversion from reactants into products having a range of densities from 72 to 75% of theoretical. In the second step, the current was increased to raise the temperature of the material, thereby sintering and densifying the product. TiC with 3 wt.% nickel (Ni) was sintered to 95 to 98% of theoretical density, while TiC without Ni was sintered to 90% theoretical density. Although TiB2 was successfully converted, efforts to fully densify the product were hindered by the limitations of the Gleeble 1500. The effects of the current and pressure levels on the product density and microstructure were examined. The advantages and limitations of this process are also discussed.
Author: Publisher: ISBN: Category : Languages : en Pages : 59
Book Description
Titanium carbide (TiC) and titanium diboride (TiB2 ceramics were formed from elemental powders using a Gleeble 1500 dynamic thermomechanical process simulator. In the first step of a two-step process, a self-propagating high-temperature synthesis (SHS) reaction was initiated by the passage of an electric current through the powdered green body. The temperature of the body was maintained at about 800 deg C, and the reaction rate was controlled by the application of a pressure of about 35 MPa. As verified by x-ray diffraction analysis, this procedure resulted in complete conversion from reactants into products having a range of densities from 72 to 75% of theoretical. In the second step, the current was increased to raise the temperature of the material, thereby sintering and densifying the product. TiC with 3 wt.% nickel (Ni) was sintered to 95 to 98% of theoretical density, while TiC without Ni was sintered to 90% theoretical density. Although TiB2 was successfully converted, efforts to fully densify the product were hindered by the limitations of the Gleeble 1500. The effects of the current and pressure levels on the product density and microstructure were examined. The advantages and limitations of this process are also discussed.
Author: Anatoli A. Borisov Publisher: CRC Press ISBN: 9781560329787 Category : Science Languages : en Pages : 348
Book Description
Self-Propagating High-Temperature Synthesis of Materials is a collection of papers that reflects modern trends in self-propagating, high-temperature synthesis (SHS), a process for synthesis of modern materials carried out in the mode of autowave solid-flame combustion. To date, SHS-produced materials have found their application in different branches of modern science and technology, mechanical engineering, ferrous and nonferrous metallurgy, aerospace engineering, chemical industry, electrical engineering, and electronics. This book is useful not only for the SHS community, but also for researchers and engineers who are active in the following related fields of knowledge; theory and practice of combustion, materials science and technology, pure and applied chemistry, and metallurgy.
Author: Normand D. Corbin Publisher: ISBN: Category : Languages : en Pages : 18
Book Description
Conventional ceramic processing normally consists of two stages: first, a powder having the desired physical and chemical characteristics is prepared, then it is heated to promote interparticle bonding (sintering) and densification. This generally requires high temperature (1200-2000'C) and controlled atmospheres (vacuum - high pressure). Often the sintering stage may require up to several days to carry out. An alternative method termed 'Self-Propagating High-Temperature Synthesis (SHS) is described in this review. The process utilizes the heat generated by an exothermic reaction between precursor components to densify the resulting reaction products. The heat generated by these reactions is capable of producing temperatures in excess of 2500'C. Since the heat is 'self-generated, ' high temperature furnaces are not required. Processing times are on the order of seconds/minutes rather than hours/days as in conventional processes. In addition to these attributes, products produced by SHS to be of higher purity than the starting materials since the high temperatures vaporize the volatile contaminants. Further, intractable borides and carbides can be produced by this technique.
Author: Chang Chun Ge Publisher: Trans Tech Publications Ltd ISBN: 303570399X Category : Technology & Engineering Languages : en Pages : 236
Book Description
Self-Propagating High-Temperature Synthesis is an attractive advanced technology for the synthesis of a wide variety of advanced materials, including powders and near net-shape products formed from ceramics, intermetallics, composites and functionally graded materials, by exploiting the heat-energy released by the exothermic reaction of raw materials via a self-sustaining combustion wave which propagates from one end of the specimen to the other. When compared with traditional technologies, remarkable savings in energy, time and equipment, and novel forms of equilibrium and non-equilibrium phases and high-purity products can result from using SHS.
Author: R. Cooper
Author: R. Cooper
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Author: Anatoli A. Borisov
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Author: Normand D. Corbin
Author: Chang Chun Ge
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Author: CSA Journal Division
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