Scanning Acoustic Microscope (SAM) is mainly applied to non-destructive testing of material and structural defects in Thermoelectric Cooler (TEC) manufacturing. Its core applications and technical values are as follows:

1. Key Application Directions

Thermoelectric Material Interface Defect Detection

Identify delaminations, voids and cracks at the bonding interfaces between semiconductor materials (such as Bi₂Te₃), metal electrodes and ceramic substrates, preventing the increase of interfacial thermal resistance that would degrade cooling efficiency.

Evaluate the uniformity of welding layers (solder/silver paste) and avoid local overheating failure caused by cold solder joints.

Internal Structural Analysis of Ceramic Substrates

Detect microcracks, pores and impurity distribution in insulating substrates such as alumina (Al₂O₃) and aluminum nitride (AlN).

Assess the bonding quality of copper-ceramic substrates (DBC) to prevent structural cracking induced by thermal expansion mismatch.

Packaging Structural Integrity Verification

Locate sealing failure points and internal stress cracks in TEC module packaging (metal/ceramic housing).

Analyze the bonding quality between heat sinks and thermopiles to ensure defect-free heat transfer paths.

2. Technical Advantages

Non-destructive imaging: Avoid damage to costly thermoelectric material samples.

Micron-level resolution: Detect interfacial delaminations and voids as small as 1 μm and above.

Layer scanning capability: Precisely locate defect depth, such as internal cracks inside substrates.

Automatic quantitative analysis: Rapidly calculate defect area ratio to support process optimization.

3. Typical Industrial Application Scenarios

In-process quality control: Online inspection of cold solder between thermoelectric grains and electrodes to reduce early failure risks.

High-reliability screening: Screen TEC devices resistant to thermal cycling for aerospace and medical applications, eliminating defective products with weak interfacial bonding.

Failure analysis and traceability: Perform internal imaging on modules with abnormal temperature rise to identify the root cause of abnormal thermal resistance, such as heat accumulation induced by delamination.

Note: As TEC devices develop toward miniaturization (e.g., microelectronic heat dissipation), the high precision and non-destructive features of SAM make it an indispensable tool for quality control in this industry.