MUMBAI, India, Feb. 27 -- Intellectual Property India has published a patent application (202621002133 A) filed by Solanki Vijaykumar Hargovandas, Palanpur, Gujarat, on Jan. 8, for 'nickel-free white-luster copper alloys and controlled investment casting process.'
Inventor(s) include Solanki Vijaykumar Hargovandas.
The application for the patent was published on Feb. 27, under issue no. 09/2026.
According to the abstract released by the Intellectual Property India: "A nickel-free white-luster copper alloy composition consisting essentially of 74.5-75.5% Cu, 17.5-18.5% Zn, 5.5-6.5% Sn, and 0.4-0.6% Mn exhibits silver-like appearance with CIELAB coordinates L* 76.0-79.0, a* -0.5 to +1.5, b* -4.0 to -1.0, making it suitable for jewelry and decorative applications without nickel sensitization risk. A vacuum-assisted centrifugal casting process enables production of high-quality castings by melting copper with tin and manganese in a graphite crucible under vacuum, withholding zinc until superheat temperature of 1090 C 10 C is reached, then rapidly adding zinc and commencing pouring within 45 seconds to limit zinc volatilization below 2%. Centrifugal rotation at 300-600 RPM eliminates porosity. The alloy demonstrates ultimate tensile strength of 380-420 MPa and elongation of 18-25%, and can be drawn into wire of 1.5mm diameter or less through sequential drawing operations with intermediate annealing at 450-550 C."
Disclaimer: Curated by HT Syndication.
