Study on diamond bimetallic coating technology
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摘要: 为了提高金刚石的利用率,对金刚石表面进行金属化处理,并实现其镀层厚度可控。利用高温熔盐法在金刚石表面成功镀覆1~5μm的钛镍、钛钼、钛钨、钛钴双金属镀层,利用XRD、EDS、XPS对镀层的成分进行表征分析,使用SEM对镀层形貌进行表征分析,借助Nano Measurer、AFM对四种不同的金刚石镀层进行厚度测量及表面粗糙度统计。其结果表明,镀覆温度1000℃、保温时间60min时,四种金刚石双镀层内均可形成碳化钛镀层、钛镀层,且镍、钼、钨钴均可与钛形成相应的化合物,且金刚石颗粒表面金属钛镍、钛钼、钛钨、钛钴双金属镀层均匀致密,其镀层厚度均在1~5μm范围内。四种金刚石双金属镀层中,金刚石(100)晶面粗糙度均大于其(111)晶面,且金刚石钛钴双金属镀层表面粗糙度最大,镀层最薄。盐浴镀过程中,由于金属粉和金刚石的亲和度不同,与金刚石亲和度较高的钛粉优先与金刚石进行反应生成TiC,生成的碳化物提高了金属镍、钼、钨、钴与金刚石的浸润性以及金刚石与金属基体间结合力,使得金刚石表面双金属镀层均匀致密。金刚石表面金属化可对金刚石进行保护,提高金刚石氧化温度,金刚石镀层厚度可控可提高金刚石工具应用范围。Abstract: Objectives:
In order to optimize the performance of diamond and improve its utilization rate, this paper carried out metallization treatment on the surface of diamond and successfully achieved reliable control of coating thickness.
Methods:
This article uses a high-temperature molten salt plating method to uniformly coat the surface of diamond with 1-5 μ m titanium nickel, titanium molybdenum, titanium tungsten, and titanium cobalt bimetallic coatings. In order to deeply analyze the composition and morphology characteristics of bimetallic coatings on diamond surfaces, advanced characterization techniques such as XRD (X-ray diffraction), EDS (energy dispersive spectroscopy), XPS (X-ray photoelectron spectroscopy) were used to comprehensively characterize and analyze the composition of the coatings. At the same time, SEM (scanning electron microscopy) was used to observe the morphology of the coatings in detail. In addition, Nano Measure and AFM (atomic force microscopy) were used to measure the thickness and surface roughness of four different diamond coatings.
Results:
The experimental data results show that under the conditions of coating temperature of 1000 ℃ and insulation time of 60 minutes, all four diamond bimetallic coatings can form titanium carbide coatings and titanium coatings, and stable compounds are formed between nickel, molybdenum, tungsten, cobalt elements and titanium. The presence of these compounds in the diamond coating forms stable chemical bonding energy, ensuring the stability and reliability of the coating. The titanium nickel, titanium molybdenum, titanium tungsten, and titanium cobalt bimetallic coatings on the surface of diamond particles are uniform and dense. The coating thickness of the four diamond bimetallic coatings is strictly controlled within the range of 1-5 μ m. Effective control of diamond coating thickness provides the possibility for achieving efficient application of diamond tools in various environments. Further research has found that among the four diamond bimetallic coatings, the roughness of the diamond (100) crystal plane is generally greater than that of its (111) crystal plane. Specifically, among the four types of diamond bimetallic coatings, the diamond titanium cobalt bimetallic coating exhibits the highest surface roughness and thinnest coating thickness, which is closely related to the differences in affinity and mismatch between metal nickel powder, molybdenum powder, tungsten powder, cobalt powder, diamond, and titanium powder during the salt bath plating process. Due to the high affinity between titanium powder and diamond, it preferentially reacts with diamond to generate TiC. This type of carbide not only improves the wettability of nickel, molybdenum, tungsten, cobalt and diamond, but also enhances the bonding force between diamond and metal matrix, making the bimetallic coating on the surface of diamond more uniform and dense.
Conclusions:
The metallization coating treatment on the surface of diamond not only provides effective protection for diamond, but also significantly increases the oxidation temperature of diamond. Meanwhile, due to the controllability of diamond coating thickness, this technology is expected to further expand the application range of diamond tools and meet more complex and demanding working environment requirements. This research achievement is of great significance for improving the performance and service life of diamond tools, and provides strong technical support for the widespread application of diamond materials.
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Key words:
- salt bath plating /
- diamond /
- carbide /
- bimetallic coating
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