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激光熔覆Mo2Ni3Si／NiSi金屬硅化物復(fù)合材料涂層組織與耐磨性
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TF123.33

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國家自然科學(xué)基金(50071004)和北京市自然科學(xué)基金(2022012)資助項(xiàng)目


Microstructure and Wear Properties of Laser Clad Mo2Ni3Si/NiSi Metal Silicide Composite Coatings
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    摘要:

    以39Mo-35Ni-26Si(w％)合金粉末為原料，采用激光熔覆技術(shù)，在1Cr18Ni9Ti不銹鋼基材表面翩得以Mo2Ni3Si金屬硅化物為初生相，以Mo2Ni3Si／NiSi共晶相為基體的金屬硅化物耐磨復(fù)合材料涂層。涂層的常溫干滑動(dòng)磨損試驗(yàn)結(jié)果表明，在磨損過程中，Mo2Ni3Si／NiSi共晶相輕微地優(yōu)先磨損，Mo2Ni3Si金屬硅化物微微凸出于磨損表面，起到抗磨的骨干作用。由于Mo2Ni3Si金屬硅化物具有很高的硬度和很強(qiáng)的原子間鍵合力，在磨損過程中難于變形和粘著，激光熔覆Mo2Ni3Si／NiSi金屬硅化物復(fù)合材料涂層具有優(yōu)異的耐磨性，與1Cr18Ni9Ti標(biāo)樣相比，涂層的耐磨性提高了56倍。

    Abstract:

    Mo2Ni3Si/NiSi wear-resistant metal silicide composite coatings were fabricated by laser cladding with 39Mo-35Ni-26Si(wt% ) powder as precursor on the substrate of austenitic stainless steel 1Crl8Ni9Ti. The Mo2Ni3Si/NiSi composite coatings have a fine microstructure consisting of MojNisSi primary metal silicide dendrites and the interdendritic Mo2Ni3Si/NiSi eutectic structure. The dry sliding wear test indicates that the slight preferential wear of the Mo2Ni3Si/NiSi eutectic structure occurs during the dry sliding wear process, resulting in the slight protrusion of Mo2Ni3Si metal silicide reinforced phase. Due to the high hardness and strong covalent atomic bonding of Mo2Ni3Si metal silicide, no deformation and adhesion transfer were observed on the worn surface. Laser clad Mo2Ni3Si/NiSi metal silicide composite coating has an excellent wear resistance under the dry sliding wear test condition. Wear resistance of the composite coating is up to 56 times higher than that of the austenitic stainless steel 1Crl8Ni9Ti.

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呂旭東 王華明.激光熔覆Mo2Ni3Si／NiSi金屬硅化物復(fù)合材料涂層組織與耐磨性[J].稀有金屬材料與工程,2003,(10):848~851.[Lu Xudong, Wang Huaming. Microstructure and Wear Properties of Laser Clad Mo2Ni3Si/NiSi Metal Silicide Composite Coatings[J]. Rare Metal Materials and Engineering,2003,(10):848~851.]
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