Alüminyum Matrisli Silisyum Nitrür Takviyeli Metalik Köpük Üretimi ve Karakterizasyonu

Öz

Metalik köpükler, yapılarında %90’a kadar gözenek ihtiva eden hafif malzemelerdir. Düşük yoğunlukları ve yüksek enerji absorbe etme kapasiteleri sayesinde başta otomotiv, uzay ve savunma sanayii olmak üzere birçok alanda kullanılmaktadır. Bu çalışmada %0, %2 ve %4 oranlarında silisyum nitrür (Si3N4) takviyesinin Al esaslı metalik köpüklerin makroyapı, mikroyapı, yoğunluk ve basma dayanımları üzerindeki etkileri incelenmiştir. Çalışmada ön alaşımlı Alumix 231 tozu, Si3N4 tozu ve köpürtücü ajan olarak kullanılan titanyum hidrür (TiH2) tozları kullanılmıştır. Tozlar karıştırmanın ardından sırasıyla soğuk ve sıcak olarak preslenerek preformlar elde edilmiştir. Elde edilen preformlar sınırlayıcı bir kalıbın içerisinde köpürtülerek 30x30x30 mm ebatlarında küp şeklinde metalik köpük numuneler elde edilmiştir. Köpük numunelerin mekanik özelliklerinin belirlenmesi amacıyla uygulanan basma testi sonucunda farklı oranlarda silisyum nitrür takviyeli numunelerin basma dayanımında belirgin bir fark gözlemlenmemiştir.

Anahtar Kelimeler

• Toz metalurjisi
• Al esaslı metalik köpük
• Silisyum nitrür takviyeli
• Makro ve mikroyapı
• Basma dayanımı

Production And Characterization of Aluminum Based Silicon Nitride Reinforced Metallic Foam

Abstract

Metallic foams are lightweight materials that contain up to 90% porosity in their structure. Due to their low density and high energy absorption capacity, they are used in various fields, particularly in the automotive, aerospace, and defense industries. In this study, the effects of silicon nitride (Si₃N₄) reinforcement at 0%, 2%, and 4% ratios on the macrostructure, microstructure, density, and compressive strength of Al-based metallic foams were investigated. Pre-alloyed Alumix 231 powder, Si₃N₄ powder, and titanium hydride (TiH₂) powder, used as a foaming agent, were utilized in the study. Following the mixing process, the powders were compacted through cold and hot pressing to produce preforms. These preforms were foamed within a constrained mold to obtain cube-shaped metallic foam samples with dimensions of 30x30x30 mm. Compression tests were conducted to evaluate the mechanical properties of the foam samples. The results indicated that there was no significant difference in the compressive strength of the samples reinforced with varying amounts of silicon nitride.

Keywords

• Powder metallurgy
• Al-based metallic foam
• Silicon nitride reinforced
• Macrostructure and microstructure
• Compressive strength

Kaynakça

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