DEVELOPMENT OF MANUFACTURING TECHNIQUES OF DENTOPROSTHETIC DISKS FROM GOLD ALLOYS AND THE RESEARCH OF THEIR PROPERTIES

Searching of such ways of processing at which irrevocable losses of precious metal will be minimum is necessary during the work with precious metals. In this regard it is necessary to investigate the main physico-mechanical properties of precious metals: durability, hardness, elasticity, plasticity and their rust resistance; to define temperature effect of processing on mechanical characteristics of the obtained precious metal ingots. Besides it is necessary to know physical and chemical properties of the metals which are a part of alloy, their workability by methods of metal forming, and knowledge of such properties is especially important at manufacture of dentoprosthetic disks. As a result of researches it is established that when rolling a strip of gold alloy of 900 fineness from initial thickness 4 mm to 0.55 mm, there is an extraction of grains in the direction of rolling; ultimate strength of alloy of AuAgCu 900-40 increases almost twice. Further annealing at temperature of 650 °C for 3 minutes completely restores plastic properties of the alloy.

1. Klubovich V.V., Tomilo V.A. Investigation of the effect of ultrasound on deformability of gold alloys. Vestsi Natsyyanal’nai akademii navuk Belarusi. Seryya fizika-tekhnichnykh navuk [Proceedings of the National Academy of Sciences of Belarus. Physical-technical series], 2014, no. 2, pp. 5–8. (In Russian).

2. Malyshev V.M., Rumyantsev D.V. Gold. Moscow, Metallurgiya Publ., 1979. 288 p. (In Russian).

3. Severdenko V.P., Klubovich V.V., Stepanenko A.V. Rolling and drawing with ultrasound. Minsk, Nauka i Tekhnika Publ., 1970. 280 p. (In Russian).