Mustafa AYDIN, İbrahim Okan ERDEN, Halil ARIK

Al-α-Si3N4 Kompozit Malzemelerin Difüzyon Kaynağı

Bu çalışmada toz metalurjisi metodu ile ile üretilen Al-Si3N4 kompozit malzeme değişen sürelerde, değişen sıcaklıklarda ve 2,5 MPa basınç altında difüzyon kaynağı ile birleştirilmiştir. Kompozit malzemeninin kaynaklanabilirliği üzerine α-Si3N4 miktarı ve kaynak parametrelerinin etkilerini belirlemek için numune kaynak arayüzeyleri üzerinden optic mikroskop incelemeleri ve kesme testleri yapılmıştır. Test sonuçları kaynak süresi ve kaynak sıcaklığı artarken kaynak arayüzeylerinin kesilme mukavetlerinin de artttığını göstermektedir. Numunelerin kesilme testi sonuçlarına optimum kaynak parametrelerinde üretilen (% 15 α-Si3N4 içeren numunede 2 saat süreli 640 °C sıcaklıkta üretilen numunede) metal matrisli kompozit malzemelerin difüzyon kaynak tekniği ile matris yapının % 97, 5’ i kadar mukavemette birleştirilebilir olduğunu göstermiştir.

Diffusion Welding of Al-α-Si3N4 Composite Materials

In this study, Al--Si3N4 composite, produced by powder metallurgy method, were joined at 2.5 MPa pressure with various weldingtemperatures (620, 630, and 640 °C) and durations (1,1.5, and 2 h.) by diffusion welding method. Optical microscopy examinationwas carried out from welded interfaces and shear tests were also conducted to the sample interfaces to find out the effect of weldingparameters and amount of α-Si3N4 reinforcement on the weldability properties of composite materials. The test results show thatincrease in the welding temperature and duration resulted in increase shear resistance of the welded zone. Results indicated thatoptimum parameters (welding temperatures, durations and amount of α-Si3N4 are 640 °C, 2 h., and 15wt % respectively) MMCsproduced in this study could be joined by diffusion welding technique successfully with the 97.5 % strength of base material.

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