Method for producing a powder-metallurgical product

A method for producing a powder-metallurgical product, comprising:

• providing a powder mixture;
• forming the powder mixture into a green body;
• and
• sintering the green body to form a resulting powder-metallurgical product;
• wherein the powder mixture includes:
• a first hard phase, which includes 52 to 78% by weight of molybdenum, 0 to 2% by weight of silicon, 0 to 1.5% by weight of copper and a remaining weight proportion of iron and production-related contaminations;
• a second hard phase, which includes 0 to 0.8% by weight of manganese and less than 0.1% by weight of carbon;
• 0 to 1.8% by weight of graphite;
• 0 to 5% by weight each of cobalt, tri-iron phosphide, copper, bronze, phosphorous, sulphur, calcium fluoride and molybdenum;
• 0.1 to 1.8% by weight of each of a pressing aid and a flow improver;
• and
• a remaining proportion of a total weight of the powder mixture is an iron-base powder;
• and
• wherein 30 to 70% by weight of the iron-base powder is composed of a powder including 0.8 to 1.3% by weight of carbon, 3 to 5% by weight of chromium, 0 to 1% by weight of cobalt, 0 to 0.5% by weight of manganese, 3 to 7% by weight of molybdenum, 0 to 1% by weight of silicon, 2 to 4% by weight of vanadium, 5 to 7.5% by weight of tungsten, and a remaining proportion of a total weight of the powder is iron and production-related contaminations.

A method for producing a powder-metallurgical product, comprising:

• providing a powder mixture including a first hard phase, a second hard phase, graphite, cobalt, tri-iron phosphide, copper, bronze, phosphorous, sulphur, calcium fluoride, molybdenum, a pressing aid, a flow improver, and an iron-base powder, the first hard phase including molybdenum, silicon, copper, and iron, and the second hard phase including manganese;
• forming the powder mixture into a green body;
• and
• sintering the green body to form a resulting powder-metallurgical product;
• wherein the first hard phase includes 52 to 78% by weight of molybdenum, 2% by weight or less of silicon, 1.5% by weight or less of copper, and a remaining weight proportion of iron and production-related contaminations;
• wherein the second hard phase includes 0.8% by weight or less of manganese and less than 0.1% by weight of carbon;
• and
• wherein:
• the first hard phase and the second hard phase collectively amount to 10 to 45% by weight of the powder mixture;
• graphite amounts to 1.8% by weight or less of the powder mixture;
• each of cobalt, tri-iron phosphide, copper, bronze, phosphorous, sulphur, calcium fluoride, and molybdenum amount to 5% by weight or less of the powder mixture;
• each of the pressing aid and the flow improver amount to 0.1 to 1.8% by weight of the powder mixture;
• and
• the iron-base powder forms the remainder of the powder mixture.

A method for producing a powder-metallurgical product, comprising:

• providing a powder mixture;
• forming the powder mixture into a green body;
• and
• sintering the green body to form a resulting powder-metallurgical product including carbon, chromium, cobalt, manganese, molybdenum, silicon, vanadium, tungsten, copper, calcium, sulphur, nickel, and iron;
• wherein the powder mixture includes:
• a first hard phase, which includes 52 to 78% by weight of molybdenum, 0 to 2% by weight of silicon, 0 to 1.5% by weight of copper and a remaining weight proportion of iron and production-related contaminations;
• a second hard phase, which includes 0 to 0.8% by weight of manganese and less than 0.1% by weight of carbon;
• 0 to 1.8% by weight of graphite;
• 0 to 5% by weight each of cobalt, tri-iron phosphide, copper, bronze, phosphorous, sulphur, calcium fluoride and molybdenum;
• 0.1 to 1.8% by weight of each of a pressing aid and a flow improver;
• and
• a remaining proportion of a total weight of the powder mixture is an iron-base powder;
• and
• wherein the resulting powder-metallurgical product includes 0.7 to 1.5% by weight of carbon, 2 to 5% by weight of chromium, 8 to 12% by weight of cobalt, 1% by weight or less of manganese, 12 to 18% by weight of molybdenum, 2% by weight or less of silicon, 1 to 3% by weight of vanadium, 2 to 4% by weight of tungsten, 10 to 20% by weight of copper, 0.5% by weight or less of calcium, 1% by weight or less of sulphur, 3% by weight or less of nickel, and a remainder iron and production-related contaminations.