Manufacturing method of sintered alloy, compact for sintering, and sintered alloy

A compact for sintering comprising:

• first hard particles that contain 10 to 50 mass % of Mo, 3 to 20 mass % of Cr, 2 to 15 mass % of Mn, 1 mass % or less of C, and a remainder including Fe and inevitable impurities when the first hard particles have 100 mass %;
• second hard particles that contain 60 to 70 mass % of Mo, 2 mass % or less of Si, and a remainder including Fe and inevitable impurities when the second hard particles have 100 mass %;
• graphite particles;
• and
• iron particles, wherein
• the first hard particles occupy 5 to 50 mass %, the second hard particles occupy 1 to 8 mass %, and the graphite particles occupy 0.5 to 1.0 mass % when total mass of the first hard particles, the second hard particles, the graphite particles, and the iron particles is set as 100 mass %.

A sintered alloy obtained by sintering a compact comprising:

• first hard particles that contain 10 to 50 mass % of Mo, 3 to 20 mass % of Cr, 2 to 15 mass % of Mn, 1 mass % or less of C, and a remainder including Fe and inevitable impurities when the first hard particles have 100 mass %;
• second hard particles that contain 60 to 70 mass % of Mo, 2 mass % or less of Si, and a remainder including Fe and inevitable impurities when the second hard particles have 100 mass %;
• graphite particles;
• and
• iron particles, wherein
• the first hard particles occupy 5 to 50 mass %, the second hard particles occupy 1 to 8 mass %, and the graphite particles occupy 0.5 to 1.0 mass % when total mass of the first hard particles, the second hard particles, the graphite particles, and the iron particles is set as 100 mass %, and
• in the sintered alloy, carbon is diffused into the hard particles and the iron particles.