Forgot Password Register. Already have an account? Login Register. We have received your request successfully. Our counselor will call to confirm your booking. Install the app to watch our videos and get a crystal clear understanding of concepts. X Thank you for registering with us. Please login with the same password. Encyclopedia of academic concepts Articles and project ideas Expert opinion on doubts Sample papers, board papers and exam tips Latest updates from education sector.
Please choose your registered Email Id. Continue the Learning and Knowledge Sharing journey. Remember me. Login by OTP. Become a member today! Hey , Please provide some more details below to complete sign up. Please enter your name. Please enter your mobile number. Please enter valid Mobile number. Select Class Please select the class. Forgot Password? OTP has been re-sent. Silicon Chloride is an excellent water soluble crystalline Silicon source for uses compatible with chlorides.
Carbon tetrachloride appears as a clear colorless liquid with a characteristic odor. Denser than water Silicon Tetrachloride is an excellent water soluble crystalline Silicon source for uses compatible with chlorides.
Quartz, an abundant ingredient in sand, is made up of non-crystallized silica. Silicon is a semiconductor, meaning that it does conduct electricity. Silicon, 14Si It is one of the principal deoxidizers used in the making of steels to improve soundness, i. Silicon is present in all steels to a certain extent.
Porous silicon has a layer of hydrogen just one atom thick covering its surface. The explosion is so violent because oxidising silicon releases a huge amount of energy compared with conventional explosives. And using liquid oxygen rather than gas means there are lots of oxygen atoms at the silicon surface. Silicone is a type of plastic polymer that can be a popular choice for sink caulking. Deoxidized steel Also known as killed steel is steel that has some or all of the oxygen removed from the melt during the steelmaking process.
As a result, killed steel is dense in structure, uniform in composition, and not so segregative as other types of steels. During the steel making process, oxygen may become dissolved in the liquid metal. Sulphur improves machinability but lowers transverse ductility and notched impact toughness and has little effects on the longitudinal mechanical properties. Free cutting steels have sulphur added to improve machinability, usually up to a maximum of 0.
To make a killed steel, aluminum which has a stronger affinity for oxygen than carbon, manganese, or silicon is added to the molten steel before it is poured.
The aluminum locks up the oxygen, in the form of aluminum oxide, so that it cannot form gas bubbles during welding. Vacuum deoxidation is a method which involves using a vacuum to remove impurities. A portion of the carbon and oxygen in steel will react, forming carbon monoxide. CO gas will float up to the top of the liquid steel and be removed by a vacuum system.
Sulphur causes hot shortness due to formation of FeS formed during solidification of steel. Sulphide inclusions lower weldability and corrosion resistance. Presence of sulphur may also lead to development of tear and cracks on reheating the steel.
0コメント