amounts of aragonite and lime mainly quick lime the product is the result of thermal transformation of a substance containing calcite and or argonite and or quick lime or hydrated lime the thermal transformation is carried out by thermal sputtering using a plasma torch in which the substance is injected in powder form into a plasma jet application_number US 68949796 A description the thermal sputtering of the substance onto a prosthesis 1 such as the femoral shank of a hip prosthesis is an atmospheric plasma generating sputtering operation using a plasma torch 2 cooled by water 20 as shown in fig1 in the torch the substance 3 in powder form is injected from a powder dispenser 4 through a pressurized powder pipe 41 into a strongly exothermic plasma jet 44 and acquires high kinetic energy so that it is sprayed and deposited onto the surface of the prosthesis 1 the plasma torch 2 is connected to a store of cylinders 5 equipped with flowmeters and containing gases such as argon and or nitrogen and other additive gases such as hydrogen and or helium the gas mixture can be a mixture of a control unit 6 is connected by pipes 71 to the store 5 to control the proportions of the gases and their flowrate in a predetermined gas mixture 7 fed to the torch via a pipe 72 the control unit 6 also controls voltage sources including a high frequency source 21 of the torch 2 and also slaves the flowrate of the powdered substance 3 in the.