Comparison of Temperature Resistance Range for Friction Shims: Working Condition Differences and Selection Guide between 120℃ and 150℃

I. Why Temperature Resistance Performance Matters

The temperature resistance range of diamond friction shims serves as a core indicator for evaluating environmental adaptability. Under high-temperature working conditions such as automotive engines, wind turbine gearboxes, and aerospace power systems, the shims operate continuously at elevated temperatures. Insufficient temperature resistance may cause coating softening, friction coefficient degradation, particle shedding and other failures, ultimately compromising connection reliability.

Operating temperatures vary drastically across different applications: approximately 80–120°C for automotive chassis, up to 150°C near engine components, 80–100°C for wind turbine gearboxes, and aerospace components may endure an even wider temperature spectrum. Selecting friction shims with a proper temperature rating is critical to guarantee long-term reliability.

II. Comparison of Common Temperature Resistance Grades

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DAOLER® diamond friction shims adopt the Diamond Claw® interlocking technology, with a temperature range of -40℃ ~ 150℃, covering the vast majority of industrial application scenarios.

III. Working Condition Differences between 120℃ and 150℃ Grades

1. Areas around automotive engines The temperature inside an automotive engine compartment is generally 100–150℃, with higher readings near the exhaust system. 120℃ rated shims face risks of coating softening for long-term service around engines, while 150℃ rated shims operate stably to secure the reliability of critical connections for engine brackets and transmission systems.
2. Electric drive systems of new energy vehicles The operating temperature of electric drive motors and controllers usually ranges from 80–120℃, with peak temperatures reaching 140℃. The 150℃ temperature rating can cover peak temperatures and prevent performance degradation caused by temperature fluctuations.
3. Wind turbine gearboxes Oil temperature inside wind turbine gearboxes is normally 60–90℃, yet it may exceed 100℃ under extreme operating conditions. The 120℃ rating basically meets requirements, whereas the 150℃ rating delivers greater safety margin.
4. Industrial robots Reducer joints of robotic arms typically run at 40–80℃, but temperatures may rise above 100℃ during continuous high-speed operation. The 120℃ rating satisfies most scenarios; the 150℃ rating is recommended for applications requiring high precision.
5. Aerospace Aerospace components are subjected to extreme thermal cycling ranging from -55℃ low temperature to over 150℃ high temperature. The 150℃ rating is a basic requirement, and higher temperature resistance is needed for partial applications.

IV. Effects of High Temperature on Friction Shim Performance

1. Impact on friction coefficient Rising temperature softens metallic materials, which generally leads to a downward trend of friction coefficient. Nickel‑phosphorus alloys start to lose hardness above 120℃. For conventional nickel‑phosphorus coatings, the friction coefficient may degrade by 10–20% at 150℃. With high-phosphorus formulation and diamond particle reinforcement, DAOLER controls friction coefficient degradation within 5% at 150℃.
2. Impact on coating hardness The hardness of nickel‑phosphorus alloys declines as temperature increases. High-hardness coatings of ≥1000HV can maintain above 800HV at 150℃, while conventional 600HV coatings may drop below 400HV at 120℃, severely impairing wear resistance.
3. Impact on particle retention force Matrix softening at high temperatures reduces clamping force on diamond particles and raises the risk of particle detachment. High-hardness matrix (≥1000HV) can retain sufficient particle retention force at 150℃ to ensure stable friction performance.
4. Impact on dimensional stability Temperature variation induces thermal expansion and affects dimensional accuracy of shims. DAOLER adopts substrates with low thermal expansion coefficient and precise thickness control (tolerance ±5%) to guarantee dimensional stability over a wide temperature range.

V. Technical Implementation of DAOLER 150℃ Temperature Resistance

1. High-phosphorus nickel‑phosphorus alloy formulation High-phosphorus nickel‑phosphorus alloy with phosphorus content controlled at 10–12% delivers superior thermal stability and less hardness degradation at 150℃.
2. Diamond particle reinforcement Diamond particles feature an ultra-low thermal expansion coefficient (approx. 1×10⁻⁶/℃), maintaining dimensional stability at high temperatures and improving high-temperature mechanical properties of the matrix.
3. Precise heat treatment Optimized heat treatment process forms stable precipitated Ni₃P phase structure to enhance high-temperature hardness retention.
4. Substrate selection High-strength spring steel or stainless steel substrates are selected to ensure mechanical strength and elasticity at high temperatures.

VI. Selection Guide

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VII. Conclusion

Temperature resistance range is a key indicator for selecting diamond friction shims. Although there is merely a 30℃ difference between the 120℃ and 150℃ grades, their performance differs remarkably under high-temperature working conditions. For high-temperature applications such as engine peripherals and electric drive systems, the 150℃ rating is essential to ensure long-term reliability.

With wide-temperature-range performance of -40℃ ~150℃, static friction coefficient ≥0.6 and coating hardness ≥1000HV, DAOLER® Diamond Claw® interlocking technology provides independently controllable, highly reliable precision connection solutions for various industries. DJKJ (Shandong) Co., Ltd. can deliver customized temperature resistance schemes and technical support according to customers’ specific working conditions.