Formation mechanism and characterization of gradient density in corundum–spinel refractory

Ya, Xin; Yin, Han; Tang, Yun; Wan, Qi; Gao, Kui; Yuan, Hu; Wang, Zhi Wei

doi:10.1016/j.ceramint.2018.12.199

Cited by 26 publications

(18 citation statements)

References 10 publications

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“…This is possibly due to the existence of stronger bonding between CABs and matrix. Because the generated microcracks in CABs provided the channels for the diffusion and deposition of reaction products which were illustrated in our previous work 10 . As shown in Table 1, the RUL of specimens was also measured.…”

Section: Resultsmentioning

confidence: 99%

“…In our previous work, lightweight Al 2 O 3 ‐MgAl 2 O 4 refractories with guaranteed mechanical properties and low thermal conductivity were obtained due to the density gradient structure existing in the matrix of refractories 9‐11 . Considering the service environment of these refractories, besides mechanical strength, thermal shock resistance was also an important issue.…”

Section: Introductionmentioning

confidence: 99%

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Effect of alumina bubbles with and without Al₂O₃ coatings on the performance of lightweight Al₂O₃‐MgAl₂O₄ refractories

Xin

Yin

Tang

et al. 2020

Int J Applied Ceramic Tech

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In this work, the effect of alumina bubbles with Al 2 O 3 coatings (CABs) and without coatings (ABs) on the performance of lightweight refractories was investigated. It showed that the addition of either ABs or CABs was beneficial to improve mechanical properties of refractories. The compressive strength for the specimens with 1 wt% ABs and CABs addition increased from ~50.5 to ~60.9 and ~70.2 MPa. The refractoriness under load was enhanced from ~1589 to ~1617 and ~1623°C. Furthermore, the results of three-point bending tests showed significant improvement was achieved in thermal shock resistance in terms of the value of residual strength ratio from 16% to 43% for specimens with CABs addition. Meanwhile, the results of ultrasonic pulse velocity measurement indicated that there is a good consistency between two evaluation methods. In order to achieve the trade-off between lightweight and overall performance, the introduction of CABs into lightweight refractories is feasible and effective.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of alumina bubbles with and without Al₂O₃ coatings on the performance of lightweight Al₂O₃‐MgAl₂O₄ refractories

Xin

Yin

Tang

et al. 2020

Int J Applied Ceramic Tech

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“…However, the apparent porosities were typically above 20%. Through the carbothermal reduction of MgO, Yin et al fabricated lightweight corundum‐spinel refractory material with an apparent porosity of approximately 30% . Based on the characteristic of superplasticity, lightweight Al 2 O 3 ‐MgAl 2 O 4 refractory with a closed porosity of 16% and pore size of 10 μm was obtained by Yuan et al Fu et al fabricated lightweight alumina containing microscale intracrystalline pores and investigated its slag corrosion behavior .…”

Section: Introductionmentioning

confidence: 99%

“…Through the carbothermal reduction of MgO, Yin et al fabricated lightweight corundum-spinel refractory material with an apparent porosity of approximately 30%. 6,7 Based on the characteristic of superplasticity, lightweight Al 2 O 3 -MgAl 2 O 4 refractory with a closed porosity of 16% and pore size of 10 μm was obtained by Yuan et al 8 Fu et al fabricated lightweight alumina containing microscale intracrystalline pores and investigated its slag corrosion behavior. [9][10][11][12] They pointed out that an isolation layer formed on the surface of the lightweight alumina during a slag corrosion test, converting the direct dissolution of lightweight alumina into indirect dissolution, meaning that the lightweight | 2263 FU et al…”

Section: Introductionmentioning

confidence: 99%

Fabrication of lightweight alumina with nanoscale intracrystalline pores

Huang

et al. 2019

J Am Ceram Soc

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In this study, lightweight alumina containing nanoscale intracrystalline pores was fabricated by introducing zirconia sol and alumina sol into α‐Al2O3 micropowder. The effects of zirconia sol on the sintering behavior of lightweight alumina were also investigated. With the introduction of zirconia sol, the grain growth and phase transformation of nano‐alumina are delayed. Therefore, the structure of the nanoscale pores between nanoparticles can be stabilized during heat treatment, and numerous nanoscale intracrystalline pores with diameters in the range of 50‐300 nm are trapped in the alumina grains. Because of the existence of these nanoscale intracrystalline pores, the thermal conductivity of lightweight alumina decreases significantly. Lightweight alumina with the addition of 0.75 wt% zirconia sol exhibits 31% lower thermal conductivity compared to alumina without zirconia sol.

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“…In our previous study, lightweight corundum-spinel (Al 2 O 3 -MgAl 2 O 4 ) refractory, with density gradient structure from center to surface, was prepared by carbothermal reduction of MgO, the oxygen diffusion rate controlled oxidation of Mg vapor, and subsequent reaction between MgO and Al 2 O 3 23 and the formation mechanism of density gradient was characterized. 24 The carbon as reducing agent and pore-forming substance in this method prominently influences the microstructural evolution and properties of lightweight corundum-spinel refractory with density gradient. Flaky graphite and carbon black, common carbon and easily to be obtained, were widely used as carbon sources in the fabrication of refractories containing carbon.…”

Section: Introductionmentioning

confidence: 99%

Effect of carbon sources on the properties of lightweight corundum‐spinel refractory with density gradient

Wan

Yin

Tang

et al. 2019

Int J Applied Ceramic Tech

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Lightweight refractories are expected to have excellent performance in high and room temperature in addition to energy consumption reduction. Lightweight corundum-spinel refractory was fabricated by carbothermal reduction of MgO, the oxygen diffusion rate controlled oxidation of Mg vapor, and subsequent reaction between MgO and Al 2 O 3 . The lightweight corundum-spinel refractory was characterized by X-ray diffraction and scanning electron microscopy. Effects of flaky graphite particle size and carbon black content on the properties of lightweight corundum-spinel refractory were investigated. The results showed that flaky graphite particle size had great effect on the stacking density of green compacts and the properties of refractory. When flaky graphite particle size was 42.44 µm, the refractory possessed bulk density 2.68 g/cm 3 , compressive strength (CS) 63.5 MPa, and refractoriness under load 1641°C fired at 1550°C for 4 hours. With the decrease of carbon black content, the properties of refractory increased, but the CS was low due to the generation of structure defects including large pores and cracks when compared with the samples using graphite as carbon source. In order to obtain lightweight refractory with good performance, the carbon particle size and content should be chosen properly in addition to firing temperature and holding time. K E Y W O R D Scarbon black, corundum-spinel, flaky graphite, lightweight refractory, particle size How to cite this article: Wan Q, Yin H, Tang Y, et al. Effect of carbon sources on the properties of lightweight corundum-spinel refractory with density gradient. Int J Appl Ceram Technol. 2020;17:598-605.

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Formation mechanism and characterization of gradient density in corundum–spinel refractory

Cited by 26 publications

References 10 publications

Effect of alumina bubbles with and without Al₂O₃ coatings on the performance of lightweight Al₂O₃‐MgAl₂O₄ refractories

Effect of alumina bubbles with and without Al₂O₃ coatings on the performance of lightweight Al₂O₃‐MgAl₂O₄ refractories

Fabrication of lightweight alumina with nanoscale intracrystalline pores

Effect of carbon sources on the properties of lightweight corundum‐spinel refractory with density gradient

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Formation mechanism and characterization of gradient density in corundum–spinel refractory

Cited by 26 publications

References 10 publications

Effect of alumina bubbles with and without Al2O3 coatings on the performance of lightweight Al2O3‐MgAl2O4 refractories

Effect of alumina bubbles with and without Al2O3 coatings on the performance of lightweight Al2O3‐MgAl2O4 refractories

Fabrication of lightweight alumina with nanoscale intracrystalline pores

Effect of carbon sources on the properties of lightweight corundum‐spinel refractory with density gradient

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Product

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About

Effect of alumina bubbles with and without Al₂O₃ coatings on the performance of lightweight Al₂O₃‐MgAl₂O₄ refractories

Effect of alumina bubbles with and without Al₂O₃ coatings on the performance of lightweight Al₂O₃‐MgAl₂O₄ refractories