fa بررسی تاثیر زمان فرآیندهای حساس‌سازی و فعال‌سازی بر پوشش‌دهی پودر SiC به روش الکترولس نیکل سایر موارد Other fields پژوهشي Research <span style="font-size:11pt"><span style="line-height:150%"><span style="direction:rtl"><span style="unicode-bidi:embed"><span new="" roman="" style="font-family:" times=""><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">در این پژوهش تاثیر زمان حساس‌سازی و فعال‌سازی پودر </span></span></span><span dir="LTR" style="line-height:150%">SiC</span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"> بر آبکاری الکترولس نیکل این پودر </span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">بررسی شد. برای این منظور پس از انجام فرآیند آماده‌سازی سطح در مدت زمان‌های 10 و 20 دقیقه، عملیات آبکاری در دماهای </span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:150%">C</span></span>^{<span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span cambria="" style="font-family:">&deg;</span></span></span>} <span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">75، </span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:150%">C</span></span>^{<span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span cambria="" style="font-family:">&deg;</span></span></span>} <span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">85 و </span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:150%">C</span></span>^{<span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span cambria="" style="font-family:">&deg;</span></span></span>} <span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">95 به مدت 15 دقیقه در حمام آبکاری الکترولس نیکل با </span></span></span><span dir="LTR" style="line-height:150%">pH</span><span style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"> 13 انجام شد. جهت بررسی مورفولوژی ذرات پوشش داده شده از میکروسکوپ الکترونی روبشی مجهز به آنالیزگر </span></span></span><span dir="LTR" style="line-height:150%">EDS</span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">استفاده شد و به منظور تعیین ترکیب و فازهای موجود در پودرهای </span></span></span><span dir="LTR" style="line-height:150%">SiC</span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">پوشش داده شده، دستگاه پراش پرتو ایکس مورد استفاده قرار گرفت. <span style="background:yellow">نتایج نشان داد که </span></span></span></span><span lang="FA" style="font-size:12.0pt"><span style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">افزایش مدت زمان قرارگیری ذرات </span></span></span></span><span dir="LTR" style="background:yellow"><span style="line-height:150%">SiC</span></span><span lang="FA" style="font-size:12.0pt"><span style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"> در دستگاه فراصوت در طول فرآیندهای حساس‌سازی و فعال‌سازی با افزایش مکان‌های لازم برای احیا، رسوبات حاوی نیکل را بر سطح ذرات افزایش داده و میزان پوشش بیشتری بر سطح ذرات </span></span></span></span><span dir="LTR" style="background:yellow"><span style="line-height:150%">SiC</span></span><span style="font-size:12.0pt"><span style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"> تشکیل شده است. </span></span></span></span><span lang="FA" style="font-size:12.0pt"><span style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">با بالا رفتن دمای آبکاری نیز میزان رسوبات حاوی نیکل بر سطح ذرات بیشتر شده است</span></span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"> <span style="background:yellow">که این امر ناشی از افزایش </span></span></span></span><span lang="FA" style="font-size:12.0pt"><span style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">سرعت انجام واکنش‌ها در حمام آبکاری الکترولس نیکل</span></span></span></span><span lang="FA" style="font-size:12.0pt"><span style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"> می‌باشد.</span></span></span></span> <span lang="FA" style="font-size:12.0pt"><span style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">با این حال </span></span></span></span><span lang="FA" style="font-size:12.0pt"><span style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">افزایش زمان آماده سازی و افزایش دما به </span></span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="background:yellow"><span style="line-height:150%">C</span></span></span>^{<span lang="FA" style="font-size:12.0pt"><span style="background:yellow"><span style="line-height:150%"><span cambria="" style="font-family:">&deg;</span></span></span></span>} <span lang="FA" style="font-size:12.0pt"><span style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">85 و </span></span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="background:yellow"><span style="line-height:150%">C</span></span></span>^{<span lang="FA" style="font-size:12.0pt"><span style="background:yellow"><span style="line-height:150%"><span cambria="" style="font-family:">&deg;</span></span></span></span>} <span lang="FA" style="font-size:12.0pt"><span style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">95 </span></span></span></span><span lang="FA" style="font-size:12.0pt"><span style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">سبب افزایش غلظت یون‌های </span></span></span></span><span dir="LTR" style="background:yellow"><span style="line-height:150%">Ni²⁺</span></span> <span lang="FA" style="font-size:12.0pt"><span style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">در محلول و تشکیل رسوب </span></span></span></span><span dir="LTR" style="background:yellow"><span style="line-height:150%">Ni(OH)₂</span></span> <span lang="FA" style="font-size:12.0pt"><span style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">شده است. در نتیجه در صورت افزایش زمان آماده سازی و دمای آبکاری نیاز به میزان بیشتری عامل کمپلکس کننده است تا غلظت یون‌های </span></span></span></span><span dir="LTR" style="background:yellow"><span style="line-height:150%">Ni²⁺</span></span> <span lang="FA" style="font-size:12.0pt"><span style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">را در محلول کاهش داده و رسوب </span></span></span></span><span dir="LTR" style="background:yellow"><span style="line-height:150%">Ni(OH)₂</span></span> <span lang="FA" style="font-size:12.0pt"><span style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">تشکیل نشود.</span></span></span></span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">در دمای </span></span></span><span dir="LTR" style="line-height:150%">C</span>^{<span lang="FA" style="line-height:150%"><span cambria="" style="font-family:">&deg;</span></span>}<b> </b><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">85 پوشش نیکل </span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">بصورت یکنواخت‌تری بر سطح ذرات </span></span></span><span dir="LTR" style="line-height:150%">SiC</span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">قرار گرفته است. </span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">در دمای بالاتر (</span></span></span><span dir="LTR" style="line-height:150%">C</span>^{<span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span cambria="" style="font-family:">&deg;</span></span></span>}<b> </b><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">95)، </span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">بالا بودن سرعت واکنش‌ها در حمام آبکاری موجب خوشه‌ای شدن پوشش نیکل و ایجاد لایه غیریکنواخت در سطح ذرات </span></span></span><span dir="LTR" style="line-height:150%">SiC</span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"> شده است.</span></span></span> &nbsp;</span></span></span></span></span> <span style="font-size:11pt"><span style="line-height:150%"><span style="tab-stops:303.75pt"><span style="font-family:Calibri,sans-serif"><span lang="EN" new="" roman="" style="font-family:" times=""><span style="color:#1f1f1f">In this study, the effect of sensitization and activation time of SiC powder on electroless nickel plating of this powder was investigated. For this purpose, after performing the surface preparation process for 10 and 20 minutes, plating was performed at temperatures of 75&deg;C, 85&deg;C, and 95&deg;C for 15 minutes in an electroless nickel plating bath with a pH of 13. A scanning electron microscope equipped with an EDS analyzer was used to examine the morphology of the coated particles, and an X-ray diffraction instrument was used to determine the composition and phases present in the coated SiC powders. <span style="background:yellow">The results showed that increasing the time the SiC particles were in the ultrasonic device during the sensitization and activation processes increased the number of sites required for reduction, increasing the amount of nickel-containing deposits on the surface of the particles and forming a greater amount of coverage on the surface of the SiC particles. As the plating temperature increases, the amount of nickel-containing deposits on the surface of the particles increases, which is due to the increase in the rate of reactions in the electroless nickel plating bath. However, increasing the preparation time and increasing the temperature to 85&deg;C and 95&deg;C, increased the concentration of Ni²⁺ ions in the solution and formed Ni(OH)₂ precipitate. As a result, if the preparation time and plating temperature are increased, a greater amount of complexing agent is required to reduce the concentration of Ni²⁺ ions in the solution and prevent the formation of Ni(OH)₂ precipitate.</span> At 85&deg;C, the nickel coating was more uniformly deposited on the surface of the SiC particles. At a higher temperature (95&deg;C), the high reaction rate in the plating bath caused the nickel coating to cluster and create a non-uniform layer on the surface of the SiC particles.</span></span></span></span></span></span> پوشش‌دهی ذرات SiC, آبکاری الکترولس نیکل, فرآیندهای حساس‌سازی و فعال‌سازی, دمای آبکاری. Coating of SiC particles, Electroless nickel plating, Sensitization and activation processes, Plating temperature. 0 0 http://ijcse.ir/browse.php?a_code=A-10-95-14&slc_lang=fa&sid=1 Mohamad Reza Tavakoli محمدرضا توکلی mohamad67.tavakoli@gmail.com 10031947532846005390 10031947532846005390 No Iranian Research Organization for Science & Technology (IROST) سازمان پژوهش های علمی و صنعتی ایران Seyedeh Mina Saeedi Heydari سیده مینا سعیدی حیدری m.saeedi@irost.ir 10031947532846005391 10031947532846005391 Yes Iranian Research Organization for Science & Technology (IROST) سازمان پژوهش های علمی و صنعتی ایران