Joining of SiC Ceramic with Ternary Carbide Ti3SiC2

2005 ◽  
Vol 475-479 ◽  
pp. 1255-1258 ◽  
Author(s):  
Hongying Dong ◽  
Wen Bo Han ◽  
Shu Jie Li
Keyword(s):  
Thermal Properties ◽  
Base Material ◽  
External Pressure ◽  
Weld Strength ◽  
Mechanical And Thermal Properties ◽  
Technological Parameters ◽  
Orthogonal Experiments ◽  
Ternary Carbide ◽  
Sic Ceramic ◽  
The Subject

The investigation on joining of SiC to SiC has been conducted for some years. It is essential that the mechanical and thermal properties of the joints should meet the requirements of engineering. In view of the fact that the ternary carbide Ti3SiC2 has shown unique mechanical and thermal properties, it is promising to join SiC to SiC using ternary carbide Ti3SiC2 as filler (welding compound), and this is the subject to deal with in this paper. The joining of SiC to SiC has been successfully realized by hot pressing reaction joining process using Ti3SiC2 powder as filler. The optimized technological parameters have been obtained by orthogonal experiments, under which the achieved weld strength is higher than that of the welding base material SiC ceramic. Ti3SiC2 is stable up to 1200oC in Ar atmosphere with an external pressure. At the joining temperatures of 1300～ 1600oC the main phases of the interface are Ti3SiC2, TiC and TiSi2. The mechanism of bonding at the interface is interdiffusion and chemical reaction.

Joining of SiC Ceramic to High Strength Graphite Using Polysiloxane with Active Additive

2007 ◽  
Vol 353-358 ◽  
pp. 2092-2095
Author(s):  
Shu Jie Li ◽  
Xiao Kun Yuan ◽  
Ting Zhang ◽  
Yang Wu Mao ◽  
Lian Sheng Yan
Keyword(s):  
Bending Strength ◽  
Weld Zone ◽  
Base Material ◽  
High Strength ◽  
Interfacial Area ◽  
Weld Strength ◽  
Technological Parameters ◽  
Orthogonal Experiments ◽  
Sic Ceramic ◽  
Active Additive

In order to contribute to the development of the joining technique of Cf/SiC, joining of SiC ceramic to high strength graphite was investigated. This joining has been successfully realized by reaction joining process using a preceramic polymer, polysiloxane, mixed with the active additive Al-Si powder as joining material. The weld strength is strongly affected by the technological parameters and the ingredient ratio (polysiloxane:Al-Si powder). The optimized factors have been obtained by orthogonal experiments, under which the achieved three-point bending strength of the joints is 96.8% of the strength of the welding base material graphite. The microstructure and composition of the weld zone were analyzed by SEM, EDX and XRD. The results show that the joining material has transformed into a densified interlayer with the thickness of about 15μm. Also, diffusion takes place in the interfacial area, which contributes to a sound interfacial bonding. The interlayer is composed of SiC, Al2O3 and Si.

Joining of SiC Ceramic by High Temperature Brazing Using Ni-Cr-SiC Powders as Filler

2007 ◽  
Vol 336-338 ◽  
pp. 2394-2397
Author(s):  
Shu Jie Li ◽  
Yang Wu Mao ◽  
Yue Hui He
Keyword(s):  
High Temperature ◽  
Bending Strength ◽  
Weld Zone ◽  
Base Material ◽  
Product Layer ◽  
Weld Strength ◽  
Technological Parameters ◽  
Major Phase ◽  
Sic Ceramic ◽  
Filler Mass

Joining of ceramics is of importance from both technical and economical points of view. Brazing is a widely used process to join ceramics. In order to increase the working temperature and weld strength of joints, a high temperature brazing process using Ni-Cr-SiC powders (consisting of Ni, Cr and SiC powders) as filler to join recrystallized SiC ceramic has been investigated. The obtained optimized technological parameters are joining temperature of 1360°C, holding time of 5min and filler mass of 280mg. Under these conditions the maximum relative bending strength of joints, 70.5%, is achieved. Microstructure and phase analysis reveals that interdiffusions and chemical reactions take place in the weld zone. A reaction layer, of which the major phase is Ni2Si, exists between the welding base material SiC ceramic and the filler reaction product layer, called as interlayer, of which the major phase is Cr23C6.

Joining of SiC Ceramic by Hot Pressing Reaction Joining Process Using Ni-51Cr Powders as Filler

2007 ◽  
Vol 336-338 ◽  
pp. 2398-2401 ◽  
Author(s):  
Yang Wu Mao ◽  
Shu Jie Li ◽  
Yan Zhang
Keyword(s):  
Hot Pressing ◽  
Bending Strength ◽  
Orthogonal Experiment ◽  
Weld Zone ◽  
Base Material ◽  
Product Layer ◽  
Weld Strength ◽  
Technological Parameters ◽  
Sic Ceramic ◽  
Joining Process

Joining of ceramics is of importance from both technical and economical points of view. Joining of recrystallized SiC ceramic to itself has been realized by hot pressing reaction joining process using Ni-51Cr powders (consisting of Ni+51wt%Cr powders) as filler. The optimized technological parameters have been obtained by orthogonal experiment, which are joining temperature of 1150°C, holding time of 20min, joining pressure of 10MPa and cooling rate of 0.25°C/s. The most effective factor to influence the weld strength is joining pressure within the range of testing. Under the optimized conditions, the maximum relative bending strength of joint, 70.7%, is achieved. The microstructure and phase composition of the weld zone were examined by SEM, EDX and XRD. The results show that interdiffusions and chemical reactions take place in the joining process. A reaction layer, which is mainly composed of Ni2Si and Ni3C with a little Cr, exists between the welding base material SiC ceramic and the filler reaction product layer called as interlayer, which is mainly composed of Ni2Si and Cr.

Nanomaterials and Nanocomposites Thermal and Mechanical Properties Modelling

2019 ◽  
pp. 234-256 ◽  
Author(s):  
Siddhartha Kosti
Keyword(s):  
Thermal Properties ◽  
Structural Properties ◽  
Base Material ◽  
High Strength ◽  
Mechanical And Thermal Properties ◽  
Thermal And Mechanical Properties ◽  
Weight Percentage ◽  
Structural Applications ◽  
Glass Frp ◽  
Selection Of

This chapter deals with the modelling of nanomaterial and nanocomposite mechanical and thermal properties. Enrichment in the technology requires materials having higher thermal properties or higher structural properties. Nanomaterials and nanocomposites can serve this purpose accurately for aerospace or thermal applications and structural applications respectively. The thermal system requires materials having high thermal conductivity while structural system requires materials having high strength. Selection of the material for particular application is very critical and requires knowledge and experience. Al, Cu, TiO2, Al2O3, etc. are considered for thermal applications while epoxy-glass, FRP, etc. are considered for structural applications. Modelling of these nanomaterials and nanocomposites is done with the help of different mathematical models available in the literature. Results show that addition of the nanoparticle/composite in the base material can enhance the thermal and structural properties. Results also show that amount of weight percentage added also affects the properties.

Nanomaterials and Nanocomposites Thermal and Mechanical Properties Modelling

2021 ◽  
pp. 180-199
Author(s):  
Siddhartha Kosti
Keyword(s):  
Thermal Properties ◽  
Structural Properties ◽  
Base Material ◽  
High Strength ◽  
Mechanical And Thermal Properties ◽  
Thermal And Mechanical Properties ◽  
Weight Percentage ◽  
Structural Applications ◽  
Glass Frp ◽  
Selection Of

This chapter deals with the modelling of nanomaterial and nanocomposite mechanical and thermal properties. Enrichment in the technology requires materials having higher thermal properties or higher structural properties. Nanomaterials and nanocomposites can serve this purpose accurately for aerospace or thermal applications and structural applications respectively. The thermal system requires materials having high thermal conductivity while structural system requires materials having high strength. Selection of the material for particular application is very critical and requires knowledge and experience. Al, Cu, TiO2, Al2O3, etc. are considered for thermal applications while epoxy-glass, FRP, etc. are considered for structural applications. Modelling of these nanomaterials and nanocomposites is done with the help of different mathematical models available in the literature. Results show that addition of the nanoparticle/composite in the base material can enhance the thermal and structural properties. Results also show that amount of weight percentage added also affects the properties.

scholarly journals Modern Hybrid Excited Electric Machines

Energies ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5910
Author(s):  
Marcin Wardach ◽  
Ryszard Palka ◽  
Piotr Paplicki ◽  
Pawel Prajzendanc ◽  
Tomasz Zarebski
Keyword(s):  
Thermal Properties ◽  
Permanent Magnets ◽  
Scientific Research ◽  
Electric Machines ◽  
Electrical Machines ◽  
Mechanical And Thermal Properties ◽  
The Subject ◽  
Excitation Circuit

The paper deals with the overview of different designs of hybrid excited electrical machines, i.e., those with conventional permanent magnets excitation and additional DC-powered electromagnetic systems in the excitation circuit. The paper presents the most common topologies for this type of machines found in the literature—they were divided according to their electrical, mechanical and thermal properties. Against this background, the designs of hybrid excited machines that were the subject of scientific research of the authors are presented.

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