MIM Technology: Shaping the Future of Chips and AI Hardware

In the era of explosive computing power, manufacturing must keep pace. The bottleneck in the big model era lies not only in chips but also in the entire hardware system that houses the chips in data centers and ensures stable operation under full load. Factors like high heat flux density, dense interconnections, rapid maintenance, and batch consistency determine the return on investment for data centers. Metal Injection Molding (MIM), known for its characteristics of "near-net shaping, complex geometry, and controllable batch cost," is rapidly penetrating AI servers, GPU clusters, liquid cooling systems, and high-speed connectors. While not a "universal key," MIM is the optimal solution in many scenarios where complexity of design and batch consistency are both essential.

Applications of MIM Technology: From Heat Dissipation Frameworks to High-Speed Interconnect "Innards"

In AI server cooling systems, MIM plays a key role in combining structure and functionality. Components like the fastening socket of heat dissipation modules, position and compression supports for heat pipes/heat spreaders, irregular reinforcing ribs in airflow guides, end caps and plenum manifolds of cold plate assemblies, locking mechanisms and cores of quick connectors are some examples. These parts have high geometrical freedom, complex wall transitions, and require one-time formation of assembly benchmarks, which MIM accomplishes by merging multiple machining processes and sheet metal welding into one.

In high-speed interconnects, components like cages and housings of GPU-GPU/NIC QSFP/QSFP-DD/OSFP connectors, shielding covers, positioning pins, and load-bearing elements of backplane connectors are designed and manufactured using MIM. MIM facilitates the integration of thin walls, fine ribs, and slots for mechanical strength and electromagnetic shielding. Trays sliding rails, hot-swappable handles, stress concentration areas in PSU casings in switches and storage arrays also commonly employ MIM parts made from precipitation-hardened stainless steels like 17-4PH, offering lightweight, toughness, and fatigue resistance.

Liquid cooling serves as the second "lifeblood" of computational infrastructure. For small valve bodies, complex tees, quick connect core bodies, pump shell positioning rings, cold plate end caps, MIM enables the creation of internal channels, O-ring grooves, stops, and positioning pins in one shot, with better dimensional repeatability than sheet metal welding assembly, reduced leakage risks, and improved batch yield stability.

Why MIM: The "Sweet Spot" of Performance, Cost, and Yield Triangle

The core advantages of MIM lie in its ability to achieve near-final shape in a single molding process with batch replicability. After debinding and sintering, part densities typically reach 96%-98% of theoretical density, exhibiting strength and fatigue performance close to forged/bar material counterparts. Typical dimensional accuracy ranges from ±0.3%-0.5%, and critical benchmarks can be achieved through minor secondary finishing processes. Compared to CNC, MIM significantly reduces machining time for parts with complex 3D surfaces, internal cavities, and undercuts. In contrast to die casting, MIM's powder metallurgy system offers broader material coverage, stable formation of thin walls and fine features, without the need for high-tonnage casting machines and post-processing for porosity removal. Compared to metal 3D printing, MIM demonstrates cost and speed advantages for batch sizes exceeding 10,000 units, with superior dimensional consistency and a more mature material system.