Investigation of magnesia, zirconia additives and process parameters in solgel derived alumina ceramic by experiment design method

Abstract

In this study, the production of corundum ceramic sand by sol-gel method with the addition of different amounts of magnesia and zirconia additives and the process parameter boehmite was examined by the experimental design method. The effects of additive and process parameters on the hardness, single particle compressive strength, density and microstructural properties of the final alumina ceramic sand were investigated. Using boehmite and additives together, the highest single particle compressive strength value of 105.90 N was achieved in sands sintered at 1400 °C. Compressive strength test results were grouped by the Tukey method, and in pairwise comparisons of the experiments, both different results and also similar results were observed. In SEM examinations, it was observed that the microstructure of the sands consisted of a closed porous structure with a homogeneous distribution in 100 nm dimensions. Density values were measured as 4.00 g/cm3 in experment number 9 sintered at 1500 °C, where all additives and the amount of boehmite were highest levels. The lowest density values were measured in control experiments sintered at the same temperature.

Keywords

• Alumina
• Zirconia
• Magnesia
• Sol-Gel
• Single particle compressive strength

Sol-Jel yöntemiyle alümina seramik üretiminde magnezya, zirkonya katkılarının ve proses parametrelerinin deney tasarım yöntemiyle incelenmesi

Öz

Bu çalışmada, magnezya ve zirkonya katkı maddeleri ve proses parametresi böhmitin farklı miktarlarda eklenmesiyle sol-jel yöntemiyle korundum seramik kum üretimi deney tasarım yöntemiyle incelenmiştir. Katkı ve proses parametrelerinin nihai alümina seramik kumunun sertlik, tek parçacık basma mukavemeti, yoğunluk ve mikroyapısal özelliklerine etkisi araştırılmıştır. Böhmit ile katkıların birlikte kullanılması 1400 °C’de sinterlenen kumlarda tek parçacık basma mukavemetinde en yüksek 105.90 N değerine ulaşılmıştır. Basma mukavemeti testi sonuçları Tukey yöntemi ile gruplandırılmış ve deneylerin ikili karşılaştırmalarında birbirleri ile farklı olan sonuçlar olduğu gibi benzer sonuç verenlerde gözlenmiştir. SEM incelemelerinde kumların mikroyapılarının 100 nm boyutlarda homojen dağılımda kapalı gözenekli bir yapıdan oluştuğu gözlenmiştir. Tüm katkıların ve böhmit miktarının en yüksek olduğu 1500 °C’de sinterlenen 9 No.lu deneyde yoğunluk değerleri 4.00 g/cm3 olarak ölçülmüştür. En düşük yoğunluk değerleri ise aynı sıcaklıkta sinterlenen kontrol deneylerinde ölçülmüştür.

Anahtar Kelimeler

• Alümina
• Zirkonya
• Magnezya
• Sol-Jel
• Tek parçacık basma mukavemeti

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