2.1 Silicon-Carbide (SiC)
Initially, Silicon carbide (SiC) was accidentally introduced by Edward G. Acheson in 1890. Silicon Carbide can be stated as a chemical compound of Silicon and the carbon. Edward G. Acheson was running an experiment on the synthesis of diamonds. At that time, it was produced by a high temperature electro chemical reaction of sand and carbon. We can also find the silicon carbide very rarely in nature in very small amounts. Also Edward G. Acheson was the first person to synthesize Silicon carbide. He used to pass an electric current through a mixture of carbon and clay for the synthesis of SiC. Still today, SiC is produced by a solid state reaction of sand (silicon dioxide) and petroleum coke (carbon). Production of SiC …show more content…
During the welding process, heating may be continued, but frequently the heat from welding is sufficient to maintain the desired temperature without a continuation of the external source of heat. The interpass temperature, defined as the base metal temperature at the time when welding is to be performed between the first and last welding passes, cannot be permitted to fall below the preheat temperature.
2.2.1 Requirement of preheating
The particles are preheated in order to remove the volatile substances and to maintain the particle temperature closer to melt temperature. Also, in SiC particles preheating leads to the artificial oxidation of the particle surface forming SiO2 layer. This SiO2 layer helps in improving the wet ability of the …show more content…
The number following the decimal point indicates whether the alloy is a casting (.0) or ingot (.1 or .2). A capital letter prefix indicates a modification to a specific alloy.
Example: Alloy - A356.1 the capital A (Axxx.x) indicates a modification of alloy 356.1 the number 3 (A3xx.x) indicates Silicon plus copper and/or magnesium series. The 56 (Ax56.1) identifies the alloy within the 3xx.x series. The .1 (Axxx.1) indicates that it is a final shape of ingot. The composition, physical, mechanical properties of A356.1 Aluminium alloy are shown in table 2.3, 2.4, 2.5 respectively. Table 2.3: A356.1 Aluminium alloy Composition.
ELEMENT Weight Percentage
Aluminium (Al) 91.73
Silicon (Si) 7.23
Iron (Fe) 0.32
Copper (Cu) 0.18
Magnesium (Mg) 0.38
Manganese (Mn) 0.02
Zinc (Zn)
Initially, Silicon carbide (SiC) was accidentally introduced by Edward G. Acheson in 1890. Silicon Carbide can be stated as a chemical compound of Silicon and the carbon. Edward G. Acheson was running an experiment on the synthesis of diamonds. At that time, it was produced by a high temperature electro chemical reaction of sand and carbon. We can also find the silicon carbide very rarely in nature in very small amounts. Also Edward G. Acheson was the first person to synthesize Silicon carbide. He used to pass an electric current through a mixture of carbon and clay for the synthesis of SiC. Still today, SiC is produced by a solid state reaction of sand (silicon dioxide) and petroleum coke (carbon). Production of SiC …show more content…
During the welding process, heating may be continued, but frequently the heat from welding is sufficient to maintain the desired temperature without a continuation of the external source of heat. The interpass temperature, defined as the base metal temperature at the time when welding is to be performed between the first and last welding passes, cannot be permitted to fall below the preheat temperature.
2.2.1 Requirement of preheating
The particles are preheated in order to remove the volatile substances and to maintain the particle temperature closer to melt temperature. Also, in SiC particles preheating leads to the artificial oxidation of the particle surface forming SiO2 layer. This SiO2 layer helps in improving the wet ability of the …show more content…
The number following the decimal point indicates whether the alloy is a casting (.0) or ingot (.1 or .2). A capital letter prefix indicates a modification to a specific alloy.
Example: Alloy - A356.1 the capital A (Axxx.x) indicates a modification of alloy 356.1 the number 3 (A3xx.x) indicates Silicon plus copper and/or magnesium series. The 56 (Ax56.1) identifies the alloy within the 3xx.x series. The .1 (Axxx.1) indicates that it is a final shape of ingot. The composition, physical, mechanical properties of A356.1 Aluminium alloy are shown in table 2.3, 2.4, 2.5 respectively. Table 2.3: A356.1 Aluminium alloy Composition.
ELEMENT Weight Percentage
Aluminium (Al) 91.73
Silicon (Si) 7.23
Iron (Fe) 0.32
Copper (Cu) 0.18
Magnesium (Mg) 0.38
Manganese (Mn) 0.02
Zinc (Zn)