بهبود خواص مکانیکی پوشش‌های پلاسمایی نانوساختار اکسیدکروم از طریق ایجاد نانوکامپوزیت Cr2O3-20YSZ-10SiC

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی معدن و متالورژی، دانشگاه صنعتی امیرکبیر، تهران، ایران

2 دانشکده مواد فلزی، دانشگاه صنعتی مالک اشتر، تهران، ایران

چکیده

در این پژوهش تولید پوشش نانوساختار Cr2O3-20YSZ-10SiC از طریق آسیاکاری جداگانه پودرهای اولیه اکسیدکروم، YSZ و کاربیدسیلیسیوم به مدت پنج ساعت در آسیاب با انرژی بالا، مخلوط پودرهای آسیاشده به ترتیب به نسبت‌های 70، 20 و 10 در­صد حجمی و در ادامه پاشش پودرهای آگلومره بر سطح زیرلایه فولادی ضدزنگ 304L انجام گرفت. پس از آن خواص مکانیکی پوشش‌های تولیدی شامل سختی، استحکام‌ چسبندگی و چقرمگی در مقایسه با پوشش نانوساختار اکسیدکروم خالص ارزیابی گردید. بر­اساس آنالیزهای اشعه ایکس از پودرهای آسیاشده و پوشش‌ها، هیچ فاز جدیدی در حین آسیاکاری پودرها و پاشش پلاسمایی ایجاد نگردید. تصاویر میکروسکوپ الکترونی روبشی از ریزساختار پوشش‌ها نشان دادند که پوشش‌های تولیدی دارای ساختار نانو هستند. بر­اساس آنالیز تصویری عکس های میکروسوپ نوری از سطح مقطع پوشش‌ها، با ایجاد کامپوزیت درصد تخلخل‌ها در پوشش تولیدی از 7/8 به 8/12 افزایش یافت. ارزیابی خواص مکانیکی پوشش‌ها نشان داد که پوشش‌های تولیدی دارای استحکام چسبندگی بالایی در محدود 40-49 مگاپاسکال بودند. هم­چنین با افزودن ذرات YSZ و SiC تا مقادیر به ترتیب 20 و 10 درصد حجمی به پوشش نانوساختار اکسیدکروم و ایجاد کامپوزیت، مقادیر میانگین سختی پوشش از 823 به 910 ویکرز و چقرمگی آن از MPam1/2  9/7 به MPam1/2 1/8 افزایش یافتند.

کلیدواژه‌ها


عنوان مقاله [English]

Improving Mechanical Properties of Nanostructured Cr2O3 Plasma Sprayed Coating through formation of Cr2O3-20YSZ-10SiC Nanocomposite Coatings

نویسندگان [English]

  • mehdi Hashemi 1
  • Nader Parvin 2
  • Zia Valefi 1
1 Department of Mining & Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran
2 Department of Metallic Materials, Malek-Ashtar University of Technology, Tehran, Iran
چکیده [English]

Cr2O3, YSZ and SiC nano-powders were prepared by ball milling and subsequently mixed and agglomerated to reach the proper composition and size for spraying. Morphological investigations and particle size analysis showed that powder particles after 5h of milling time reached to an ultrafine/nano size. The powder mixtures were then deposited onto 304L steel substrates using Atmospheric Plasma Spray (APS) to deposit Cr2O3-20vol%YSZ-10vol%SiC composite coating. Microstructure and morphology of the elemental/milled powders and plasma sprayed coatings were characterized using Field Emission scanning electron microscopy (FESEM) equipped by EDS. X-ray diffraction (XRD) patterns of powder particles and coatings included only the elemental peaks without any traces of impurities and new appearance peaks. Using image analysis method, the coatings porosity content increased from 8.7 to 12.8 through formation of composite coating. Also mechanical properties of the coatings including bonding strength, micro hardness and fracture toughness were evaluated. The results showed that coatings have high bonding strength of 40-49 MPa. Regarding hardness and toughness results, adding reinforcements to Cr2O3 coating increased hardness and toughness to 910 HV and 8.1 MPam1/2, respectively.

کلیدواژه‌ها [English]

  • Nanocomposite
  • Cr2O3-YSZ-SiC
  • Ceramic
  • Ball milling
  • Plasma spray
  • Mechanical properties

 

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