Technical Forum
Engineering deep dives: tolerances, debinding, sintering and process know-how for MIM parts.
What New Requirements Does Co-Packaged Optics (CPO) Place on Thermal Components? Materials and Structural Responses
Co-packaged optics (CPO) integrates optical engines with high-power ASICs, transforming thermal components from simple heat spreaders into precision structures that must simultaneously manage heat flux, flatness, and coefficient of thermal expansion (CTE) mismatch. This…
MIM Near-Net-Shape Forming for Optical Module Housings and Thermal Management Parts: Which Machining Operations Can Be Eliminated?
Machining copper optical module housings and thermal heat spreaders is notoriously expensive due to excessive cycle times, massive material waste, and high tool wear. Near-net-shape metal injection molding (MIM) solves this by shifting complex 3D features like internal…
Tuning the mechanical integrity and corrosion performance of open-cell copper foams: identification of an optimization threshold
Download PDF Abstract In this work, Porous copper foam samples were fabricated by a space-holder technique with water-atomized copper powder and sodium chloride (NaCl) particles in weight fractions ranging from 10 to 35 wt%. The powders were mechanically mixed at a 10:1…
Structural Design Essentials for VCSEL Package Heat Sinks: Heat-Flow Path, Solder-Face Flatness and Coplanarity
Designing heat sinks for VCSEL packages presents a dual challenge: managing thermal dissipation while maintaining strict optical alignment through precise solder-face flatness and coplanarity. This article explores how geometric finishing operations, rather than raw material…
Why Do EML/DFB Laser Submounts Use Tungsten Copper? Thermal Expansion Matching and Failure Modes
Selecting the right submount material for EML and DFB laser packages requires balancing thermal expansion matching with heat dissipation, rather than just maximizing thermal conductivity. Pure copper offers excellent heat spreading but causes severe cyclic shear strain in the…
How to Choose Materials for 800G/1.6T Optical Module Heat Spreaders? Conductivity, CTE and Forming Route for Copper, W-Cu and AlSiC
As 800G and 1.6T optical modules face rising power densities within fixed MSA envelopes, selecting the right heat spreader material becomes a complex trade-off between thermal conductivity, coefficient of thermal expansion, and manufacturability. This article evaluates copper…
How Should the Sintering Atmosphere Be Set for Pure Copper and Copper Alloy MIM? The Effect of Oxygen Content on Thermal Conductivity and Brazeability
For copper Metal Injection Molding (MIM) parts, achieving optimal thermal conductivity and brazeability depends heavily on controlling oxygen content during the sintering process. The core engineering challenge lies in managing the oxygen budget introduced by ultrafine…
How Much IACS Conductivity Can Copper MIM Parts Retain? The Mechanisms by Which Density and Grain Size Matter
Design engineers and procurement decision-makers often question whether copper metal injection molding parts can retain sufficient electrical conductivity compared to machined wrought copper. This article addresses the core engineering challenge of conductivity loss in…
How Are Copper MIM Parts Plated with Nickel, Tin, Silver or Gold? Coating Adhesion and Compatibility with Downstream Soldering and Bonding
Plating copper metal injection molding (MIM) parts presents unique challenges due to sintered surface porosity and residual oxides, which can cause blistering and adhesion failures during downstream soldering or wire bonding. This article addresses the engineering problem of…
How Does Copper Content in Tungsten–Copper Affect Thermal Conductivity and CTE? A Grade Comparison from W90Cu10 to Higher-Copper Grades
Design engineers and procurement teams often select tungsten-copper grades based on trade names rather than actual thermal properties, leading to mismatched thermal expansion and joint fatigue in electronic packaging. This article addresses the engineering challenge of…
How to Choose Between Tungsten-Copper (W-Cu) and Pure Copper Heat Sink Substrates: The Matching Logic of Thermal Conductivity and CTE
Selecting the right heat sink substrate requires carefully balancing thermal conductivity with the coefficient of thermal expansion to prevent interface fatigue. While pure copper offers peak thermal conductivity, its high expansion rate causes severe solder joint cracking…
Forming accuracy improvement of W-Cu microchannels fabricated by laser powder bed fusion
Highlights • W-Cu microchannels exhibit larger roundness errors than 316L, with relative deviations more pronounced at smaller radii. • Post-contour scanning significantly improves 316L accuracy, whereas zoned annular scanning is more beneficial for W-Cu. • Poor forming…
How Fine Can Copper MIM Micro-Fins and Micro-Channels Get? Feature Size, Demolding, and Sintering Distortion Boundaries
Next-generation thermal hardware for 5G optical transceivers and high-density computing modules requires ultra-thin copper micro-fins and micro-channels. While traditional CNC machining struggles with unit costs at high volumes, copper metal injection molding offers a highly…