Royal Metal Powders Maryville, TN 865-982-8096. Royal Metal Powders is a manufacturer and marketer of Copper Powder, Brass, Premix and Pre-Alloy Bronze Powders, Nickel/Silver, Tin Powder, Electrolytic Copper Powder, Phos Copper, and Lead Powders. We produce specifically designed powders for infiltration, carbon brushes, brazing pastes, friction ...