Outline

  • Abstract
  • Keywords
  • 1. Introduction
  • 2. Material Design and Experimental Work
  • 3. Results and Discussion
  • 3.1. Effects of Heating Rate
  • 3.1.1. Microstructure
  • 3.1.2. Mechanical Properties
  • 3.2. Effects of Metal Binder
  • 3.2.1. Effects of Ni Content in the Surface Layer
  • 3.2.2. Effects of Ni/(co + Ni) Ratio in the Substrate
  • 3.2.3. Effects of Ni Content in the Substrate
  • 4. Conclusions
  • Acknowledgments
  • References

رئوس مطالب

  • چکیده
  • 1.معرفی
  • 2.طراحی مواد و کار تجربی
  • 3.نتایج وبررسی
  • 1.3تاثیرات نرخ گرمایشی
  • 1.1.3ریز ساختار
  • 2.1.3 خواص مکانیکی
  • 2.3 تأثیرات چسب های فلزی (متال بایندرها)
  • 1.2.3 تأثیرات درصد نیکل روی لایه سطحی
  • 2.2.3 تأثیرات نسبت Vi/(CO+Vi) بر زیرسطح
  • 3.2.3 تأثیرات میزان نیکل در زیر سطح
  • 4. نتیجه گیری

Abstract

Self-diffusion gradient cermet composite tool materials with different metal binder contents and Ni/(Co + Ni) mass ratios were fabricated to improve the mechanical properties. The effects of heating rate and metal binder on the microstructure and mechanical properties of self-diffusion gradient composite were investigated. For the heating rates considered, it was revealed that the heating rate of 30 °C/min was in the vicinity of optimum to yield the desired mechanical properties and fine microstructure. It was found that the flexural strength increased and the hardness decreased with increasing Ni binder content, while the addition of Co binder led to an excessively thick rim phase which was detrimental to the flexural strength. Applying a proper amount of Ni binder appeared to be beneficial for fabricating gradient composites with desired self-diffusion process during sintering. For the experimental conditions considered in this study, the best mechanical properties can be obtained when 6 mass% Ni in the surface and 12 mass% Ni in the substrate were used, which gave flexural strength, substrate hardness and surface hardness at 1488 ± 190 MPa, 20.96 ± 0.30 GPa and 25.12 ± 0.48 GPa, respectively.

Keywords: - - - -

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