Hard Surface for Soft Tin Bismuth Alloy: Tough Problem

Summary for hard surface for soft tin bismuth alloy Discussion

Hard surface for soft tin bismuth alloy is the central issue: Jatin B Thakkar says his wax moulds for investment-casting wax patterns use a tin-bismuth alloy, but the mould cavity wears out quickly because the metal is too soft and gets nicked and damaged. He asks whether a plating or covering could make the surface harder and more resistant to impact and wear. The excerpt does not include a technical solution, only a follow-up question from DK Mehta asking what wax model items use bismuth alloy molds. So the thread, as shown, mainly establishes the wear problem and the need for a harder surface treatment, but does not provide an answer or recommendation.