Diffusion Welding of Al-α-Si3N4 Composite Materials

Atomic diffusion behavior in Cu-Al explosive welding process

Composite infrared bolometers with Si3N4 micromesh absorbers.

We report the design and performance of 300-mK composite bolometers that use micromesh absorbers and support structures patterned from thin films of low-stress silicon nitride. The small geometrical filling factor of the micromesh absorber provides 20x reduction in heat capacity and cosmic ray cross section relative to a solid absorber with no loss in IR-absorption efficiency. The support struc...

Modeling of Hygrothermal Damage of Composite Materials

Composite materials have been used extensively in various applications, such as mechanical engineering, aerospace engineering, and aviation thanks to their interesting mechanical properties. However, a substantial drawback in the use of such composite materials is that they absorb a significant amount of moisture when exposed to severe hygrothermal conditions. This factor dramatically affects t...

A novel friction stir welding robotic platform: welding polymeric materials

The relevance, importance and presence of industrial robots in manufacturing have increased over the years, with applications in diverse new and nontraditional manufacturing processes. This paper presents the complete concept and design of a novel friction stir welding (FSW) robotic platform for welding polymeric materials. It was conceived to have a number of advantages over common FSW machine...

تولید کامپوزیت هیبریدی Al/AlMg-Al2O3-Si3N4 به روش ریخته گری و بررسی تاثیر نانوذرات Si3N4

امروزه استفاده از نانوذرات در کامپوزیت‌های زمینه آلومینیومی به دلیل اثرات برتر آن‌ها بر خواص مکانیکی و فیزیکی مورد توجه محققان قرار گرفته است. به علت ترشوندگی ضعیف نانوذرات توسط فلز زمینه حین ریخته‌گری و نسبت بالای سطح به حجم نانوذرات رسیدن به توزیع یکنواخت ذرات درون زمینه مشکل است. همچنین در فرآیند ساخت، نانوذرات تمایل به تشکیل توده‌های ذره‌ای به شکل خوشه‌ای دارند. توده‌ای شدن نانوذرات اثرات ن...