Vacuum brazing is a manufacturing process for connecting components to achieve higher thermal performance and lighter solutions.Vacuum brazed cold plates refers to a kind of water cooled plate,which are created by machining two metal plates with internal channels and fin structures (often folded fins or skived fins),which are then carefully sealed together inside a vacuum chamber for heating.A filler metal with a lower melting point is melted into the joints of the cold plate via capillary action under the corresponding technological conditions,and connects two plates with internal channels and fin structures to form an internal flow channel.The vacuum system can be connected to the workpiece so that the pressure inside the workpiece is lower than the atmospheric pressure during vacuum brazing.

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For vacuum brazing advantages compared with other connection technologies, vacuum brazing has obvious following advantages: 

1.No flux process can be used to clean parts

2.Highly repeatable and controllable batch processing

3.Uniform material characteristics during and after brazing

4.Internal joints can be produced even in complex structures to improve the overall strength of components

Vacuum brazed cold plate has unparalleled flexibility in design,as it is not limited by the bending radius limitations of pressure tube cold plate. Heat pipes can also be embedded in the plate to improve heat dissipation. Internal fin structures can be inserted inside the vacuum brazed cold plate channels to increase the surface area in contact with the working fluid, providing greater and better heat transfer.As a result of this, vacuum brazed cold plates are the liquid cooling thermal module of choice for power generation,electric car batteries, fuel cell components,and various military,medical and avionics applications.Vacuum brazing has higher cost,but also very high reliability and and the joints are very clean. Large Numbers of cold plates can also be batched processing.

Vacuum Brazed Liquid Cold Plate

Brazing is a process of joining two or more metals, such as aluminium plates, by melting a filler metal, or the brazing alloy. The filler has a metling point well below that of the base material. This is a high-end joining technology results in parts with extremely strong joints and no residual corrosive flux.

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The benefits of vacuum brazing include uniform heating, tight temperature control, no post cleaning processes, and process repeatability. When compared to other metal-joining processes, brazing does not melt the base metal of the joint, which allows for more precise control of tolerances. Vacuum aluminium brazing also minimizes distortion of the part due to uniform heating and cooling as compared to a localized joining process. This type of brazing creates a continuous hermetically sealed bond. Vacuum furnace brazing offers extremely repeatable results due to the critical furnace parameters that are attained with every load, that is, vacuum levels and temperature uniformities.

Power electronics components require a cooling solution that is both effective and reliable. Baknor’s experience in designing and manufacturing cold plates that are aluminium vacuum brazed, allows us to achieve guaranteed tightness with no seams, robustness, corrosion free, and excellent thermal performance.

These cold plates are generally used for high-performance designs that require low thermal resistance, and superior leak-free reliability. They enable designers the greatest flexibility in specifying such criteria as thermal resistance, thermal flow, pressure drop, fluid path, size, shape, material hardness, surface geometry, and the ability to mount components on both sides of the plate. Machining flow guides can create the internal features and fins from the base metal or by introducing high-performance corrugated Aluminium-fin.

The integrity of the brazed joints meet the most demanding applications. The high reliability allows for the manufacturing of critical micro-channel devices, cold plates, radiators, micro wave antennas, and waveguides.

Brazed Cold Plates Construction

• Material Options: AL, AL, C101, C102, C110, C145
• Internal Fin Structure: Machined, Folded Fin, Stamped Fin, Extruded Fins

Brazing Standards

• Cold plates are brazed per following AWS standards:
• Copper cold plates: AWS C3.6M/C3.6: CLASS C
• Aluminium cold plates: AWS C3.7M/C3.7 CLASS C.

Diverse Coolants

Liquid cooled cold plates can be engineered to perform with diverse coolants, including water, water/glycol solutions, dielectric fluids, oils and synthe8c hydrocarbons (PAO).