Homojen çökeltme ile sentezlenmiş çinko borat ve span 60 içeren iğ yağından üretilen lubrikantlar

Abstract

Nano çinko borat tanecikleri, çinko boratın amonyakta çözülmesi ve daha sonra amonyağın yavaşca uçurulması ile nano tanecikler olarak çökelmesine dayanan homojen çökelme metodu ile elde edilmiştir. Örnekler ileri analiz teknikleri ile karakterize edilmiştir. Nano çinko borat tanecikleri Span 60 içeren iğ yağına lubrikant katkısı olarak kullanılmıştır. Optik mikroskopta tanelerin yağ içinde homojen bir şekilde dağıldığı gözlenmiştir. Lubrikantlara uygulanan dört top testleri çinko borat katkısının aşınma izi çapını önemli oranda (%61.8) küçülttüğünü göstemişitr. Test toplarının aşınmış yüzeylerinin sertliğinin 688 HV den 618 HV ye düşmesi ve yüzeyde gömülü çinko borat taneciklerinin varlığı esnek bir kabuk oluştuğunu göstermiştir. Böylece top yüzeyleri arasındaki temas alanı artarak, birim alana uygulanan yük azalmıştır. Yüzeyin pürüzlülüğü 35.63 nm den 26.60 nm ye düşmüştür. Homojen çökeltme ile elde edilen çinko boratın madeni yağa katılması ile birbirine sürtünen yüzeylerdeki aşınmanın azaldığı anlaşılmıştır.

Keywords

• dört top testleri
• homojen çökelme
• lubrikantlar
• nano tanecikler
• Span 60
• çinko borat

Lubricants having zinc borate by homogeneous precipitation and Span 60 in spindle oil

Abstract

Nano particles of zinc borate were obtained by homogeneous precipitation method which is based on dissolving zinc borate in ammonia and precipitating it as nano particles by slow evaporation of ammonia. The synthesized zinc borates were characterized by advanced analytical techniques. Zinc borate nano particles were used as a lubricant additive to spindle oil having Span 60 dispersant. The particles were well dispersed in spindle oil as shown by optical microscopy of the oils. Four ball tests of the lubricants indicated zinc borate lowered (61.8%) the wear scar diameter significantly. The hardness of wear surfaces of test balls was reduced from 688 HV to 618 HV and presence of zinc borate particles embedded on the surface indicated a flexible skin was formed. Therefore the pressure was decreased due to increase of the contact area of the balls. The surface roughness was also decreased from 35.63 nm to 27.60 nm by the addition of zinc borate to spindle oil having Span 60. Zinc borate prepared by homogeneous precipitation technique lowered the wear of the surfaces that rub to each other.

Keywords

• four ball tests
• homogeneous precipitation
• lubricants
• nano particles
• Span 60
• Zinc borate

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