ZİRKONYUM KARBÜR ESASLI AŞIRI YÜKSEK SICAKLIK SERAMİK KOMPOZİT TOZLARIN METALOTERMİK YÖNTEMLE ÜRETİMİ

Günümüzde malzeme bilimi çok gelişmiş olmasına rağmen, yeni teknolojik gereksinimler, var olanlardan farklı yeni nesil malzemelere ihtiyaç duyulmaktadır. Yakın bir gelecekte uzay yolculuğunun gerçekleşebilir olması; aşırı yüksek sıcaklık ortamlarında, çok amaçlı ve tekrarlı kullanılabilir seramik kompozit malzemelerin geliştirilmesine bağlıdır. Aşırı yüksek sıcaklık seramik malzemeleri (AYSS veya Ultra high temperature ceramics-UHTC) 2300˚C ve üzerindeki ortamlarda kullanılabilir seramikler olarak tanımlanmaktadır. Bu çalışmada, yüksek ergime noktasına sahip, kimyasal ve termal kararlılığı olan AYSS grubuna ait, ZrB2-ZrC- SiC-Al2O3 seramik kompozit tozlarının üretimi, laboratuvar şartlarında, zirkon, borik asit, metalik alüminyum ve grafit başlangıç karışımı kullanılarak araştırılmıştır. Alüminotermik yöntem kullanılmış, başlangıç karışımları ve elde edilen reaksiyon ürünleri SEM, XRD, XRF, TG/DTA gibi analiz yöntemleri ile analiz edilmiştir. Deneysel şartlara bağlı olarak, başlangıç karışımında bulunan zirkon, çok düşük sıcaklıklarda ayrışmıştır. Zirkonyum ve silisyum oksitleri, ZrC ve ZrB2 ve SiC fazına dönüştüğü görülmüştür. Karbür ve borür fazlarının haricinde, proses edilmiş numunelerde Al2O3 oluşumu da tespit edilmiştir.

Anahtar Kelimeler:

Zirkon, Zirkonyum Borür, Karbür, Alümina, Seramik

PRODUCTION OF ZRC BASED ULTRA HIGH TEMPERATURE CERAMIC COMPOSITE POWDERS BY METALLOTHERMIC METHOD

Although material science is advanced at present time, new technological developments require new generation and different materials that are commercially not available in global market. In order to make long distance space journeys possible in near future, innovation of multipurpose and reusable ceramic composite materials for at high temperature environments are needed. Ceramics that are useable at elevated temperatures as high as 2300˚C are called Ultra high temperature ceramics (UHTC). In this study, the processing of UHTCs based on ZrC/ZrB2/SiC/Al2O3 ceramic composite that has high melting point, chemical and thermal stability, at the laboratory conditions was investigated using zircon, boric acid, carbon and aluminium powders. Aluminothermic method was chosen, the starting mixtures and the obtained reaction products were analysed using SEM, XRD, XRF and TG/DTA analysis methods. The experimental results showed that, the obtained sample consists of ZrB2/ZrC as a matrix phases.

Keywords:

Zircon, Zirconium Diboride, Carbide, Alumina, Ceramic,

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