Chemical synthesis of TiO₂ nanoparticles and their inclusion in Ni-P electroless coatings

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• 作者：Preeti Makkar ; R.C. Agarwala ; Vijaya Agarwala
• 关键词：C. Wear resistance ; Electroless (EL) ; Ni3P3TiO2 ; Microhardness ; Precipitation
• 刊名：Ceramics International
• 出版年：2013
• 出版时间：December, 2013
• 年：2013
• 卷：39
• 期：8
• 页码：9003-9008
• 全文大小：3923 K

文摘

The work addresses the preparation of Ni3P3TiO₂ nanocomposite coatings on mild steel substrate by the electroless technique. Nanosized TiO₂ particles were first synthesized by the precipitation method and then were codeposited (4 g/l) into the Ni3P matrix using alkaline hypophosphite reduced EL bath. The surface morphology, particle size, elemental composition and phase analysis of as-synthesized TiO₂ nanoparticles and the coatings were characterized by field emission scanning electron microscopy (FESEM), energy-dispersive analysis of X-ray (EDAX) and X-ray diffraction (XRD). Coatings with 20 ¦Ìm thickness were heat treated at 400 ¡ãC for 1 h in argon atmosphere. The morphology, microhardness, wear resistance and friction coefficient characteristics (ball on disc) of electroless Ni3P3TiO₂ nanocomposite coatings were determined and compared with Ni3P coatings. The results show that as-synthesized TiO₂ nanoparticles are spherical in shape with a size of about12 nm. After heat treatment, the microhardness and wear resistance of the coatings are improved significantly. Superior microhardness and wear resistance are observed for Ni3P3TiO₂ nanocomposite coatings over Ni3P coatings.