Preparation and Properties of Foamable Ni-GNP/AlSi12 Precursor Materials

Öz

Bu çalışmada toz metalurjisi yöntemi ile nikel kaplı grafen nanoplakçıklar ile takviyelendirilmiş AlSi12 öncü malzemeler üretilmiştir. Bu işlem için farklı oranlarda (ağırlıkça %0, %0.4, %0.8 ve %1.2) Ni-GNP parçacıkları matris malzemesi AlSi12 tozlarına ilave edilmiştir. Akabinde karışım tozlar soğuk olarak sıkıştırılmış ve farklı oranlarda ekstrüzyon işlemine tabi tutulmuş ve 6 ve 12 mm çaplara sahip köpürebilir öncü numuneler üretilmiştir. Ni-GNP'lerin köpürebilir öncü malzemelerin özellikleri üzerindeki etkilerini değerlendirmek için mikro yapısal analizler, yoğunluk ölçümleri ve mikro sertlik testleri gerçekleştirildi. Ni-GNP/AlSi12 öncü malzemelerin mikro yapısı ve yüzey analizi, yüksek yoğunluk, Ni'nin düzgün dağılımı, lokalize Si fazları ve alüminyumun reaktifliğinden dolayı yüzey oksidasyonunu gösterdi. Ni-GNP eklenmesinin Al-Ni intermetalik fazların oluşumuna yol açtığını, Al pik yoğunluğunu azalttığını ve grafen bağını Al matrisiyle güçlendirdiğini ortaya koydu. Artan ekstrüzyon oranı ile birlikte bağıl yoğunluk artmış, daha yüksek Ni-GNP içeriği bağıl yoğunluğu azaltmış ancak ekstrüzyondan sonra önemli ölçüde iyileştirmiştir. Optimum grafen içeriğinin %0,4 ağırlıkta olmasıyla öncü malzemelerde maksimum sertlik elde edilirken, daha yüksek miktarlar kümeleşmeye, gözenekliliğin artmasına ve sertliğin azalmasına yol açmıştır.

Anahtar Kelimeler

• AlSi12
• Ni-GNP
• toz metalurjisi
• mikroyapı analizi

Etik Beyan

Ethics committee approval is not required.

Teşekkür

Not appliable

Preparation and Properties of Foamable Ni-GNP/AlSi12 Precursor Materials

Öz

In this study, nickel-coated graphene nanoplatelets reinforced AlSi12 precursor materials were produced by powder metallurgy method. For this process, Ni-GNP particles were added to the matrix material AlSi12 powders at different ratios (0%, 0.4%, 0.8% and 1.2% by weight). Then, the mixed powders were cold compressed and extruded at different ratios, and foamable precursor samples with diameters of 6 and 12 mm were produced. Microstructural analyses, density measurements and microhardness tests were carried out to evaluate the effects of Ni-GNPs on the properties of foamable precursor materials. Microstructure and surface analysis of Ni-GNP/AlSi12 precursor materials showed high density, uniform distribution of Ni, localized Si phases and surface oxidation due to reactivity of aluminum. It was revealed that the addition of Ni-GNP led to the formation of Al-Ni intermetallic phases, reduced the Al peak intensity and strengthened the graphene bond with the Al matrix. The relative density increased with increasing extrusion ratio, higher Ni-GNP content decreased the relative density but improved it significantly after extrusion. The maximum hardness was achieved in the precursor materials with the optimum graphene content of 0.4 wt%, while higher amounts led to aggregation, increased porosity and decreased hardness.

Anahtar Kelimeler

• AlSi12
• Ni-GNP
• Powder metallurgy

Etik Beyan

Ethics committee approval is not required.

Teşekkür

Not appliable

Kaynakça

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