Liquidmetal Technologies Inc (LQMT)

[jrs5]

Xiaomi heat sink using micro chambers for liquid….uses a tesla valve microstructure (micro tubes) to transfer the liquid.

https://www.gizmochina.com/2021/11/05/xiaomi-loop-liquidcool-technology-announced/

BMG Heat sink patent: https://patents.justia.com/patent/10433463

“Micro- and Nano-Channel Heat Sink

Another type of amorphous alloy heat sinks according the embodiments herein are the extended surface and micro- and/or nano-channel heat sinks, which would provide a superior performance of liquid cooling in a much smaller footprint by forcing fluid through a network of miniature passageways (micro capillaries) in an amorphous alloy heat sink cold plate mounted directly to a heat source. These compact, active solutions would be suitable for high performance microprocessors and other high heat flux density applications including insulated gate bipolar transistor (IGBT) modules. The major advantage of micro channel heat sinks is the high heat transfer coefficients would be up to 60 times higher than conventional heat exchangers.

Bulk amorphous alloys retain their fluidity from above the melting temperature down to the glass transition temperature due to the lack of a first order phase transition. This is in direct contrast to conventional metals and alloys. Since, bulk amorphous alloys retain their fluidity, they do not accumulate significant stress when cooled from their casting temperatures down to below the glass transition temperature, and as such dimensional distortions from thermal stress gradients can be minimized. Accordingly, intricate structures with large surface area and small thickness can be produced cost-effectively.

One exemplary method for producing nano- and micro-replications in structures using a molding process comprises the following steps.

1) Providing a sheet feedstock of amorphous alloy being substantially amorphous, and having an elastic strain limit of about 1.5% or greater and having a ?T of 30° C. or greater;

2) Heating the feedstock to around the glass transition temperature;

3) Forming nano- and/or micro-replication in the heated feedstock;

4) Cooling the formed component to temperatures far below the glass transition temperature; and

5) Final finishing.