Material Compatibility | Wide range: stainless steel, titanium alloy, cobalt-chromium alloy, tungsten alloy, and other hard-to-machine materials. | Primarily low-to-medium alloy steels, carbon steel, aluminum alloy, copper alloy; limited for high-hardness, high-alloy materials (high deformation resistance). |
Part Geometry Capability | Excels at complex 3D structures: internal cavities, micro-features (≥0.5mm holes), asymmetric shapes, and integrated multi-functional parts. No need for assembly. | Suitable for simple, symmetrical, load-bearing structures: shafts, gears, connecting rods, valves. Complex cavities or micro-features require additional machining. |
Dimensional Accuracy | Sintered precision: ±0.3%–±0.5% of part size; post-machining can reach ±0.01mm. High batch consistency. | Hot forging precision: ±1%–±3%; cold forging can reach ±0.1%–±0.5%. Prone to springback and die wear, leading to batch variation. |
Mechanical Properties | Densification rate: 95%–99%. Tensile strength and hardness are close to wrought metal; toughness is slightly lower than forging (due to minor residual porosity). Isotropic performance. | Full densification (no internal porosity). Refined grain structure via plastic deformation. Superior tensile strength, fatigue resistance, and impact toughness (10%–30% higher than MIM for the same material). Anisotropic performance (grain flow aligns with stress direction). |
Production Batch Suitability | Cost-effective for high-volume production (≥100,000 pieces). High initial mold cost, but unit cost decreases sharply with increased volume. | Hot forging: suitable for medium-to-high volume (≥10,000 pieces); cold forging: ideal for mass production (≥100,000 pieces). High die and equipment cost; economies of scale are obvious. |
Material Utilization Rate | ~95% (near-net-shape forming, minimal waste; scrap parts and runners can be recycled). | ~60%–80% (significant flash and excess material; scrap can be recycled but requires re-melting). |
Typical Applications | Medical surgical instruments, automotive sensor housings, aerospace micro-components, consumer electronics hardware (e.g., smartwatch gears). | Automotive crankshafts, aerospace engine connecting rods, construction machinery gears, oil drilling tools. |