ساخت و مشخصه یابی پوشش‌های نانوکامپوزیتی الکترولس Ni-P-ZrO2-TiO2 اعمال شده بر زیر لایه فولادی

نوع مقاله : مقاله پژوهشی

نویسندگان

• علی علیزاده ¹
• مهدی عبدالهی ²
• محمد فولادچنگ ¹

¹ مهندسی مواد، دانشگاه صنعتی مالک اشتر، تهران، تهران، ایران

² مجتمع دانشگاهی مواد و فناوریهای ساخت، دانشگاه صنعتی مالک اشتر، تهرا ن، تهران، ایرا ن

10.22067/jmme.2023.78787.1075

چکیده

در این پژوهش، اثر ذرات ZrO2 و TiO2 بر رفتار سایشی و سختی پوشش‌های Ni-P ایجادشده روی فولاد st37 به روش آبکاری الکترولس بررسی شد. بدین منظور ابتدا پوشش‌های کامپوزیتی Ni-P-ZrO2 در پنج غلظت متفاوت 1 تا 5 گرم بر لیتر ذره ZrO2 رسوب داده شد و پس از بررسی بهترین نمونه ازلحاظ سختی، تأثیر ذرات TiO2 در پنج غلظت 1 تا 5 گرم بر لیتر تقویت‌کننده در کنار ذرات ZrO2، بررسی گردید. تمام پوشش‌ها به مدت 1 ساعت در دمای 400 درجه سانتی‌گراد عملیات حرارتی شدند. مقاومت به سایش و ضریب اصطکاک پوشش‌ها با آزمون پین روی دیسک مورد ارزیابی قرار گرفت. سطح و مقطع پوشش‌ها و هم‌چنین سطوح سایش با استفاده از میکروسکوپ الکترون روبشی (SEM) مجهز به EDS موردبررسی قرار گرفت. آزمون پراش پرتوایکس (XRD) نیز برای بررسی هم‌نشست ذرات تقویت‌کننده و تغییرات فازی در پوشش انجام شد. نتایج نشان داد که عملیات حرارتی منجر به افزایش زبری پوشش می‌شود. مشخص شد که افزایش غلظت ذرات ZrO2 در حمام از g/l 1 به g/l 3 منجر به بهبود سختی پوشش شده و استفاده از TiO2 تا g/l 2 در کنار ZrO2 منجر به بهبود سختی پوشش Ni-P-ZrO2 خواهد شد، به‌طوری‌که سختی از 702 ویکرز در نمونه Ni-P-ZrO2(3g/l) به 813 ویکرز در نمونه Ni-P-ZrO2(3g/l)-TiO2 (2 g/l) افزایش می‌یابد. نتایج همچنین نشان داد که پوشش کامپوزیتی Ni-P-ZrO2(3g/l)-TiO2 (2 g/l) عملیات حرارتی شده دارای بالاترین ضریب اصطکاک می‌باشد.

کلیدواژه‌ها

• الکترولس نیکل
• پوشش کامپوزیتی Ni-P-ZrO2-TiO2
• زیرکونیا
• تیتانیا
• سختی

موضوعات

• متالورژی سطوح و پوشش

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عنوان مقاله [English]

Synthesis and characterization of electroless Ni-P-ZrO2-TiO2 coating on Steel substrate

نویسندگان [English]

• Ali Aliadeh ¹
• mehdi abdollahi ²
• mohammad fuoladchang ¹

¹ Assistant Professor, University Complex of Materials and Manufacturing Technologies, Malek Ashtar University of Technology (MUT), Tehran, Tehran, Iran

² University Complex of Materials and Manufacturing Technologies, Malek Ashtar University of Technology (MUT), Tehran, Tehran, Iran

چکیده [English]

In this study, the effects of zirconia and titania particles on the abrasion behavior and hardness of Ni-P and Ni-P-ZrO2 coatings on ST37 substrate by electroless technique were investigated. For this purpose, Ni-P-ZrO2 composite coatings were precipitated at five different concentrations of 1 to 5 g/l of reinforcing particle, and then, after examining the best specimen in terms of hardness, the effect of TiO2 particles in five concentrations of 1 to 5 g/l was studied as a booster alongside ZrO2 particles. The coatings were heat-treated for 1 hour at 400 °C. Resistance to wear and friction coefficient of coatings were evaluated by pin on disk test. The surface and cross-section of coatings, as well as the abrasion lines, were examined using a scanning electron microscope (SEM) equipped with an EDS test. The X-ray diffraction (XRD) test was also used to examine the coprecipitation of the reinforcing particles and phase transformations in the coatings. The results showed that the heat treatment resulted in increased hardness. Also, increasing the concentration of ZrO2 particles in the bath from 1 g/l to 3 g/l resulted in improved hardness of the coating and the use of TiO2 up to 2 g/l along with ZrO2 resulted in improved Ni-P-ZrO2 coating hardness, so that increasing TiO2 concentration to 2 g/l resulted in an increase in the hardness from 702 HV0.1 in the Ni-P-ZrO2 (3 g/l) sample to 813 HV0.1 in the Ni-P-ZrO2 (3 g/l) -TiO2 (2 g/l) sample.

کلیدواژه‌ها [English]

• Electroless Nickel
• composite coating of Ni-P-ZrO2 -TiO2
• Zirconia
• Titania
• Hardness

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