YARI SAYDAM ALÜMİNA SERAMİKLERİN ŞERİT DÖKÜM YÖNTEMİ İLE ÜRETİMİ

Abstract

Alümina tozları elektronik, metalurji, optoelektronik ve ince seramik kompozitler gibi birçok farklı endüstride kullanılmaktadır. Bu çalışmada, alüminanın su bazlı olmayan şerit dökümü, sürekli olmayan tek bıçaklı bir şerit döküm makinesinde gerçekleştirilmiştir. Dağıtıcılar, bağlayıcılar ve plastikleştiriciler gibi katkı maddeleri içeren bir çözücü içindeki alümina tozundan oluşan bir süspansiyon, sabit bir yüzey üzerine dökülmüştür. Ham şeritler daha sonra kurutulmuş ve son olarak istenen nihai şekli elde etmek için sinterlenmiştir. Alümina ham şeritlerin mikro yapısını optimize etmek ve yoğunluğunu artırmak için hidrolik presleme yöntemi ile preslenmiştir. Katmanlı alümina seramikler, sinterleme sıcaklığının mikroyapı üzerindeki etkisini gözlemlemek için 5 farklı sıcaklıkta (1450°C, 1500°C, 1550°C, 1600°C ve 1650°C) 5 saat süreyle basınçsız sinterleme yöntemiyle üretilmiştir. Sonuçlar, kullanılan süspansiyon bileşimi ile yarı saydam alümina elde etmek için sinterleme koşullarını ortaya çıkarmıştır. Yarı saydam alümina seramikler yarı iletken aygıtlarda, devre altlıklarında, ısı ve korozyona dayanıklı malzeme olarak reaksiyon tüpleri ve potalarda, medikal uygulamalarda kullanım alanı bulmaktadır.

Keywords

• Şerit Döküm
• Alümina
• Sinterleme
• Tabakalı Seramikler
• Mikroyapı.

PRODUCTION OF TRANSLUCENT ALUMINA CERAMICS BY TAPE CASTING

Abstract

Alumina powders are utilized in many industries like electronics, metallurgy optoelectronics, and fine ceramic composites. In this study, non-aqueous-based tape casting of alumina was carried out in a non-continuous single-blade tape casting machine. A slurry of alumina powder in a solvent was cast on a stationary surface with additives like dispersants, binders, and plasticizers. After the green tapes were dried, they were sintered to obtain the final desired shape. The hydraulic pressing method was used to increase the density of the alumina tapes. Layered alumina ceramics were produced at 5 different temperatures by pressureless sintering method (1450°C, 1500°C, 1550°C, 1600°C and 1650°C) for 5 h to observe the effect of sintering temperature. Results revealed the sintering conditions for obtaining translucent alumina, with the utilized slurry composition. Translucent alumina ceramics have gained importance as parts of semiconductor devices, substrates for electric parts, as heat/corrosion materials in reaction tubes and crucibles, and are used in medical equipment.

Keywords

• tape casting
• alumina
• layered ceramics
• microstructure
• sintering

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