Hard particles, wear resistant iron-based sintered alloy, method of producing wear resistant iron-based sintered alloy, valve seat, and cylinder head

A particle, wherein the composition of the particle comprises in percentage by mass:

• 20 to 60% of Mo;
• 0.2 to 3% of C;
• 5 to 40% of Ni;
• 1 to 15% of Mn;
• 0.1 to 10% of Cr;
• a balance of Fe;
• and
• impurities.

A wear-resistant iron-based sintered alloy comprising:

• a base;
• and
• a plurality of particles,
• wherein the wear resistant iron-based sintered alloy includes, in percentage by mass and with respect to the total mass of the iron-based sintered alloy as represented by 100%, 4 to 30% of Mo, 0.2 to 3% of C, 1 to 20% of Ni, 0.5 to 12% of Mn, a balance of Fe, and impurities;
• wherein the base, in percentage by mass and with respect to the total mass of the base as represented by 100%, comprises 0.2 to 5% of C, 0.1 to 12% of Mn, a balance of Fe, and impurities;
• wherein the plurality of particles, in percentage by mass and with respect to the total mass of the plurality of particles as represented by 100%, comprises 20 to 70% of Mo, 0.5 to 3% of C, 5 to 40% of Ni, 1 to 20% of Mn, a balance of Fe, and impurities;
• and
• wherein the particles are dispersed in the base with an area ratio of 10 to 60%.

A wear-resistant iron-based sintered alloy comprising:

• a base;
• and
• a plurality of particles,
• wherein the wear resistant iron-based sintered alloy, in percentage by mass and with respect to the total mass of the iron-based sintered alloy as represented by 100%, includes 4 to 30% of Mo, 0.2 to 3% of C, 1 to 20% of Ni, 0.5 to 9% of Mn, 0.05 to 5% of Cr, a balance of Fe, and impurities;
• wherein the base, in percentage by mass and with respect to the total mass of the base as represented by 100%, comprises 0.2 to 5% of C, 0.1 to 10% of Mn, a balance of Fe, and impurities;
• wherein the plurality of particles, in percentage by mass and with respect to the total mass of the plurality of particles as represented by 100%, comprises 20 to 60% of Mo, 0.2 to 3% of C, 5 to 40% of Ni, 1 to 15% of Mn, 0.1 to 10% of Cr, a balance of Fe, and impurities;
• and
• wherein the hard particles are dispersed in the base with an area ratio of 10 to 60%.

A method of producing a wear resistant iron-based sintered alloy, comprising the steps of:

• preparing a mixture by mixing, in percentage by mass, an iron powder, 0.2 to 2% of a carbon powder, and 10 to 60% of a powder of a plurality of particles, the plurality of particles comprising 20 to 70% of Mo, 0.5 to 3% of C, 5 to 40% of Ni, 1 to 20% of Mn, a balance of Fe, and impurities;
• molding said mixture to form a green compact;
• and
• sintering the green compact so as to form a wear resistant iron-based sintered alloy.

A method of producing a wear resistant iron-based sintered alloy, comprising the steps of:

• preparing a mixture by mixing, in percentage by mass, an iron powder, 0.2 to 2% of a carbon powder, and 10 to 60% of a powder of a plurality of particles, the plurality of particles comprising 20 to 60% of Mo, 0.2 to 3% of C, 5 to 40% of Ni, 1 to 15% of Mn, 0.1 to 10% of Cr, a balance of Fe, and impurities;
• molding said mixture to form a green compact;
• and
• sintering the green compact so as to form a wear resistant iron-based sintered alloy.