Manufacturing of Synthetic Diamond: Process and Techniques, Study Guides, Projects, Research of Mechanical Engineering

Download Manufacturing of Synthetic Diamond: Process and Techniques and more Study Guides, Projects, Research Mechanical Engineering in PDF only on Docsity! DIAMOND • Allotrope Of Carbon. • Face-Center Cubic Crystal Structure. • Hardness Value Of 10 on Moh’s scale of Mineral Hardness. docsity.com MANUFACTURING OF SYNTHETIC DIAMOND High Temperature and High Pressure Method (HTHP) In this method, tiny piece of diamond (seed) and pure carbon (in powdered form) are placed into a synthesis capsule. Synthesis capsule is then placed into BARS press for the application of high temperature and high pressure. Application of high temperature and high pressure synthesize the diamond in 4 days. docsity.com MANUFACTURING OF SYNTHETIC DIAMOND • BARS Press Synthesis Capsule is placed into BARS Press machine. This machine consists of 6 inner anvils to build pressure on 6 faces of synthesis capsule. These inner anvils are covered with 8 outer anvils to build up 60000 times of atmospheric pressure and atmospheric temperature. After mounting, whole assembly is placed into a barrel which is filled with oil. Oil upon heating pressurizes the barrel and hence the central cell. docsity.com __ Disc-type barrel Hydraulic oil Rubber eee (1 oae-(eL11) Steel outer anvil Tungsten carbide ialaie lanl Suess eres 10 cm : | docsity.com MANUFACTURING OF SYNTHETIC DIAMOND • Diamond Synthesis As temperature and pressure builds up inside the synthesis capsule, carbon begins to melt turning it into a super-heated liquid. Carbon atoms begin to attach themselves to the diamond-seed gradually, building up on its surfaces layer by layer. It is a slow process that’s why capsule is placed in barrel for 4 days. docsity.com