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Carbon-carbon nuts are used in pairs with carbon-carbon bolts. They are formed by 3D woven preform and multiple densification processes as an integrated structure. Compared with machined graphite nuts, they have better toughness and resist cracking and thread slipping after repeated thermal cycles.
They inherit the core advantages of C/C composites: high temperature resistance, acid and alkali corrosion resistance, low expansion and self-lubricating property. The thread engagement gap barely changes at high temperature to prevent loosening. A common pain point of high-temperature furnaces is mismatched thermal expansion between metal nuts and graphite parts, which leads to loss of preload after heating. Carbon-carbon nuts share identical thermal properties with C-C bolts and screws, ensuring reliable fastening for long-term thermal field operation.
Typical applications include vacuum heat treatment furnaces, ceramic sintering tooling, sapphire crystal growth equipment and high-temperature test chambers. Jiecheng Graphite supports custom non-standard thread profiles according to drawings and performs paired inspection to reduce on-site assembly failures.
