Effect of modified MgO aggregates on mechanical properties of magnesium aluminate spinel refractories

Abstract

Magnesium aluminate spinel (MA spinel) refractory samples were prepared and their cold and hot modulus of rupture, thermal shock resistance were determined, phase composition and microstructure were analyzed by means of XRD and SEM. Experimental results showed that: with introduction of MgO aggregates modified by α-Al₂O₃ ultrafine powder coating approach, considerable amount of well-developed spinel (MgAl₂O₄) was in-situ formed on the surface of MgO aggregates, being beneficial to reducing expansion stress and enhancing thermal shock resistance of the material, evidenced by the residual strength retention rate of 78.3%; with addition of MgO aggregates modified respectively by hydration and APS coating approaches, hot modulus of rupture (HMOR) of the material can be improved, due to the accelerated sinterability and improved interfacial bond degree of MgO aggregates and matrix, which was brought by micro and nano scaled activated secondary MgO decomposed from hydrated Mg(OH)₂ under heating.

Get full access to this article

View all access options for this article.

References

Yin

Chen

et al. Thermo-mechanical properties of Al₂O₃-C refractories with in situ synthesized non-oxide bonding phases. Ceram Int. 2019;45:7427–7436. doi: 10.1016/j.ceramint.2019.01.032

Pilli

Sarkar

Study on the nanocarbon containing Al₂O₃-C continuous casting refractories with reduced ﬁxed carbon content. J Alloy Compd. 2019;781:149–158. doi: 10.1016/j.jallcom.2018.12.002

Shan

Liao

et al. Enhanced thermal shock resistance of low-carbon Al₂O₃-C refractories withdirect CVD synthesis of nano carbon decorated oxides. J Eur Ceram Soc. 2018;38:3379–3386. doi: 10.1016/j.jeurceramsoc.2018.02.042

Labadie

Dignani

Camelli

Interaction between calcium and Al₂O₃-ZrO₂-C slide gate plates. J Mater Res Tecnol. 2012;1:103–108. doi: 10.1016/S2238-7854(12)70019-4

Aneziris

Pfaff

Maier

HR.

Corrosion mechanisms of low porosity ZrO₂ based materials during near net shape steel casting. J Eur Ceram Soc. 2000;20:159–168. doi: 10.1016/S0955-2219(99)00149-1

Tong

Zhao

et al. Eﬀect of Al addition on creep resistance of MgO-Al₂O₃ composite for sliding plate at 1400 °C. Ceram Int. 2017;43:11610–11615. doi: 10.1016/j.ceramint.2017.05.330

Szczerba

Zbigniew

Małgorzata

et al. Influence of raw materials morphology on properties of magnesia-spinel refractories. J Eur Ceram Soc. 2007;27:1683–1689. doi: 10.1016/j.jeurceramsoc.2006.04.145

Moritzn

Aneziris

CG.

Enhancing the thermal shock resistance of alumina-rich magnesium aluminate spinel refractories by an aluminum titanate phase. Ceram Int. 2016;42:14155–14160. doi: 10.1016/j.ceramint.2016.06.037

Gruber

Sistaninia

Fasching E

et al. Thermal shock resistance of magnesia spinel refractories—Investigation with the concept of configurational forces. J Eur Ceram Soc. 2016;36:4301–4308. doi: 10.1016/j.jeurceramsoc.2016.07.001

10.

Hashimoto

Zhang

Lee W

et al. Synthesis of magnesia aluminate spinel platelets from -alumina platelet and magnesium sulfate precursors. J Am Ceram Soc. 2003;86:1959. doi: 10.1111/j.1151-2916.2003.tb03589.x

11.

Mohan

Sarkar

Effect of in situ generated nascent magnesia and alumina from nitrate precursor on reaction sintered magnesium aluminate spinel. Mater Des. 2016;110:145–156. doi: 10.1016/j.matdes.2016.07.095

12.

Liu

et al. Synthesis of MgO-MgAl₂O₄ refractory aggregates for application in MgO-C slide plate. Ceram Int. 2019;45:24768–24776. doi: 10.1016/j.ceramint.2019.08.218

13.

Bag

Adak

Sarkar

Nano carbon containing MgO-C refractory: effect of graphite content. Ceram Int. 2012;38:4909–4914. doi: 10.1016/j.ceramint.2012.02.082

14.

Hou

Luo

Xie

et al. Effect of magnesia-alumina spinel precursor sol on the sintering property of fused magnesia refractory. Ceram Int. 2019;45:3459–3464. doi: 10.1016/j.ceramint.2018.11.001

15.

Kusiorowskin

Wojsa

Psiu

et al. Inﬂuence of zirconia addition on the properties of magnesia refractories. Ceram Int. 2016;42:11373–11386. doi: 10.1016/j.ceramint.2016.04.065

16.

Xie

Chen

et al. Activated sintering of activated carbon-doped magnesia. Ceram Int. 2014;40:16543–16547. doi: 10.1016/j.ceramint.2014.08.008

17.

Mahato

Beher

SK.

Oxidation resistance and microstructural evolution in MgO-C refractorieswith expanded graphite. Ceram Int. 2016;42:7611–7619. doi: 10.1016/j.ceramint.2016.01.169

18.

Zhao

Liu

et al. Preparation and thermal shock behavior of nanoscale MgAl₂O₄ spinel-toughened MgO-based refractory aggregates. Ceram Int. 2019;45:12093–12100. doi: 10.1016/j.ceramint.2019.03.107