A DLC diamond coating, method of making and using

By constructing a Ti-TiC-SiC gradient transition layer and a silicon/boron co-doped nanocomposite functional layer in a diamond-like carbon coating, the failure problem of the coating under high stress and high temperature environment was solved, achieving high bonding strength, toughness and wear resistance, and improving the service life of mechanical parts.

CN121852870BActive Publication Date: 2026-05-26NINGBO ZHONGTUO PRECISION MASCH CO LTD
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Patent Information

Application Number
CN202610291243.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-03-11
Publication Date
2026-05-26
Estimated Expiration
2046-03-11

AI Technical Summary

Technical Problem

Existing diamond-like carbon coatings are prone to failure under high contact stress, high speed operation and high temperature environments. They have insufficient bonding strength, poor thermal stability, and are difficult to balance hardness, toughness and wear resistance, thus failing to meet the service life requirements under harsh working conditions.

Method used

By employing substrate-level cleaning and ion etching pretreatment, a Ti-TiC-SiC gradient transition layer and a silicon/boron co-doped nanocomposite functional layer are constructed. Through specific deposition process parameters, a soft-hard alternating nanolayer structure is formed. Combined with a specific dual-element doping strategy, the bonding strength and toughness are enhanced, and the high-temperature graphitization transformation is suppressed.

Benefits of technology

It improves the bonding strength and fracture toughness of the coating, maintains frictional stability at high temperatures, reduces wear rate, and extends the service life of mechanical parts.

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Abstract

This invention discloses a DLC diamond coating, its preparation, and its application method, relating to the field of diamond-like carbon coating technology. Specifically, it includes the following steps: Step S1, substrate graded cleaning and ion etching pretreatment; Step S2, in-situ synthesis of a Ti-TiC-SiC gradient transition layer; Step S3, construction of a silicon / boron co-doped nanocomposite functional layer. This invention alleviates interfacial stress by constructing a gradient transition layer, utilizes a periodic modulation process to form a soft-hard alternating nanolayered structure, and combines a silicon-boron co-doping strategy; effectively solving the problems of high internal stress, poor adhesion, and easy high-temperature failure in coatings, achieving a balance between high hardness, high toughness, and excellent high-temperature wear resistance.
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