Production of Powder Metal Al7075/B4C/Si3N4 Composite Materials and Investigation of Wear Properties


KARAKOÇ H.

JOURNAL OF POLYTECHNIC-POLITEKNIK DERGISI, cilt.23, sa.4, ss.1141-1151, 2020 (ESCI İndekslerine Giren Dergi) identifier

  • Cilt numarası: 23 Konu: 4
  • Basım Tarihi: 2020
  • Dergi Adı: JOURNAL OF POLYTECHNIC-POLITEKNIK DERGISI
  • Sayfa Sayıları: ss.1141-1151

Özet

In this study, Al7075 alloy, Al7075/B4C composite material and Al7075/B4C/Si3N4 composite materials were produced by powder metallurgy method. Prealloyed Al7075 powders were used as matrix material to produce composites. The powders whose mixing ratios were determined by weight were mixed in the 3D mixer for 15 minutes. The mixture powders were pre-heated in a preheated hot stamping mold at 450 degrees C for 30 minutes. 90x40x12 mm(3) composites were obtained after pressing. Composite materials were cut at wire EDM (Electrical discharge machine) and CNC lathes were processed to produce wear samples. Density, porosity, hardness, microstructure and abrasion properties of composite materials produced by the studies were investigated. The density of Al7075 alloy was higher than the composites. Pore amount increased with increasing B4C and Si3N4 ratio. In 5% and 10% B4C reinforced composite materials, the particles were homogeneously distributed in microstructure. The highest hardness was observed in Al7075/15% B4C/2%Si3N4 composite material (110 HB). The highest coefficients of friction were found in the Al7075 alloy, which was not reinforced.