Effect of B2O3 addition on the sintering of α-Al2O3

Oxidation behaviour of an aluminium nitride–hafnium diboride ceramic composite

“…11 In order to estimate the quantity of boron oxide "trapped" through the formation of aluminium borate crystals, a simple theoretical evaluation may be performed. Given the initial composition of the composite, only 42% of B 2 O 3 produced by reaction (2) is needed to consume all the starting aluminium nitride, by reaction (5).…”

“…Oxidation leads to the formation of SiO 2 -and/or Al 2 O 3 -B 2 O 3 glass, limiting the evaporation of boron oxide, and improve the oxidation resistance of the material. [4][5][6][7][8] Concerning ceramic composites formed by aluminium nitride and borides of IVB-column metals, the oxidation behaviour of AlN-ZrB 2 9 and AlN-TiB 2 10 has been studied. In the former, a good oxidation resistance up to 1400 • C was observed with parabolic kinetics and the formation of aluminium borate crystals, Al 18 B 4 O 33 , with columnar morphology.…”

Bori̇k Asi̇t Katkisi Ve Si̇nterleme Sicakliğinin Alümi̇na Ve Sepi̇yoli̇ti̇n Isil İletkenli̇ğe Etki̇si̇ni̇n İncelenmesi̇

“…Alüminanın yüksek ergime sıcaklığı ile cam köpük malzemede mukavemet sağlayacağı düşünülmüştür. Aluminanın içerisine boron oksit katkısı olarak borik asit eklenmesi 1000°C'de yapılan sinterlemede alüminanın lifli bir yapıya tamamen dönüşmesine sebep olmaktadır [15]. Bu nedenlerle bu malzemelerin farklı oranlarda karışımının ısıl iletkenliğe etkileri incelenmiştir.…”

Effects of B2O3Addition on the Sintering Behavior of 0-5-10% ZrO2Doped BaTiO3Based Ceramics

“…Kushnirenko et al [22] investigated the eect of an addition of H 3 BO 3 on the sintering of ZnO, and found that the addition of boric acid resulted in a rise of the grain size, an increase of the grain conductivity, a quenching of defect-related luminescence, and the enhancement of exciton emission. Misirli et al [24] investigated the effect of an addition of boric oxide (B 2 O 3 ) to the sintering of Al 2 O 3 , and found that the porosity of the materials, which were made using a spray-drying technique, could be controlled by the level of addition of B 2 O 3 . This porous structure gave the material a good strength, making it a potential candidate for use in ceramic lters and for ceramic-metal composite preforms [22].…”