TUNGSTEN KARBÜR TAKVİYELİ BAKIR ESASLI KOMPOZİT TOZUNUN MEKANİK ALAŞIMLAMA YÖNTEMİYLE SENTEZİNE İŞLEM KONTROL KATKILARININ ETKİSİ

Öz

Tungsten karbür (WC) parçacık-takviyeli bakır (Cu) esaslı kompozitler geleneksel malzemelere göre özellikle aşınma dayanımı, sertlik, yüksek sıcaklık dayanımı ve ark oluşumu ile gerçekleşen malzeme transferi üzerindeki olumlu etkileri sayesinde elektrik kontak malzemesi üretiminde kullanılmaktadır. WC, elektrik kontak malzemelerinin üretiminde sıklıkla takviye malzemesi olarak kullanılır. Cu/WC kompozit tozu; işlemkontrol katkısı cinsi ve miktarı, öğütme hızı, bilye-toz-ağırlık oranı ve öğütme süresi gibi birçok işlem parametresinin optimize edilmesi sayesinde mekanik alaşımlama (MA) yöntemi ile üretilebilir. Bu nedenle çalışmada işlem kontrol katkısının, Cu/WC kompozit toz sentezine etkisi araştırılmıştır. Bu amaçla Cu ve WC tozlarından oluşan karışıma katı işlem kontrol katkısı olarak stearik asit, polietilen glikol ve çinko stearat ayrı ayrı ilave edilerek oluşturulan üç farklı karışım bilyeli öğütücüde öğütülmüştür. Polietilen glikol kullanımında öğütme verimi en düşük seviyelerde iken çinko stearatın 16 saate kadar belirgin etkisi öne çıkmaktadır. Ortalama toz boyutu değerleri ve SEM görüntülerinin karşılaştırılmasından 25 saatlik öğütme sonucunda en uygun işlem kontrol katkısının stearik asit olduğu tespit edilmiştir.

Anahtar Kelimeler

• Bakır esaslı elektrik kontak malzemeleri
• Çinko stearat
• İşlem kontrol katkısı
• Polietilen glikol
• Stearik asit
• Tungsten karbür

Effect of Process Control Agents on the Synthesis of Tungsten Carbide Reinforced Copper Based Composite Powder Using Mechanical Alloying Method

Öz

Tungsten carbide (WC) particle-reinforced copper (Cu) based composites, due to their wear resistance, hardness, high-temperature strength and excellent resistance to material transfer through arcing as compared to conventional materials, are used to produce electrical contact materials. WC is frequently used as a reinforcing material in production of electrical contact materials. Cu/WC composite powder can be produced using mechanical alloying (MA) technique by carefully optimizing a number of process parameters such as type and amount of process control agent, milling speed, ball-to-powder weight ratio and milling time. Therefore, this study investigated the effect of process control agent on the synthesis of Cu/WC composite powder. For this aim, three different powder mixtures containing Cu powder, WC powder and separately added solid process control agents (stearic acid, polyethylene glycol and zinc stearate) were milled in a ball-mill. The usage of zinc stearate was found effective up to 16 hours of milling whereas polyethylene glycol decreased milling efficiency to minimal value as compared to the other process control agents. In comparing average particle sizes and SEM pictures after 25 hours of milling, stearic acid was found the most suitable choice.

Anahtar Kelimeler

• Copper based electrical contact materials
• Zinc stearate
• Process control agent
• Polyethylene glycol
• Stearic acid
• Tungsten carbide

Kaynakça

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