Comparison of spark plasma and microwave sintering of mullite based composite: Mullite/Ta2O5 reaction

Lin

et al. 2019

In order to effectively utilize industrial solid wastes (ISW), an eco-friendly permeable brick was successfully prepared by using quartz sand-tailing and steel slag. The influence of sintering temperature on the properties including permeability, apparent porosity, water absorption, bulk density, mechanical strengths, and chemical stability was systematically investigated. The research results show that with increasing sintering temperature, the structure of the permeable brick gradually become dense, which may be due to liquid phase sintering caused by a small amount of glass-liquid phase (Ca-Fe-Si-Al-O glass system). The permeability, apparent porosity, and water absorption decrease gradually, while the bulk density and mechanical strengths increase monotonously. Furthermore, the best sintering schedule for the permeable brick is 1320°C for 1 hour, with the optimized parameters, the permeable brick exhibits excellent properties (permeability, 3.65 × 10 −2 cm/s; compressive strength, 34.1 MPa; bending strength, 5.2 MPa; chemical stability, above 99%), wherein the permeability is far beyond Chinese standard (1 × 10 −2 cm/s). The permeable brick in this work provides a promising way for the recycle of ISW. Even better, it can maximize the introduction of quartz sand-tailing and steel slag (reach 100%) and create huge economic benefits while protecting environment. K E Y W O R D S mechanical strengths, permeability, permeable brick, quartz sand-tailing, steel slag How to cite this article: Liu J, Li C, Lin C, et al. Use of steel slag and quartz sand-tailing for the preparation of an eco-friendly permeable brick.

Section: Resultssupporting

confidence: 82%

Use of steel slag and quartz sand‐tailing for the preparation of an eco‐friendly permeable brick

Lin

et al. 2019

“…It is found that both the T A B L E 2 Permeability (K), apparent porosity (ε), water absorption (W), water retention (WR), bulk density (ρ), compressive strength (σ c ), bending strength (σ b ) and chemical stability (η permeability and apparent porosity show decreasing trends with increasing sintering temperature. [39][40][41] Our results in Table 2 are also consistent with the relationship. Moreover, a number of references have reported that the relationship between permeability and apparent porosity in porous materials is consistent with some predictive models.…”

Section: F I G U R Esupporting

confidence: 88%

“…On the other hand, many references have found that both the apparent porosity and water absorption were opposite to the bulk density. [39][40][41] Our results in Table 2 are also consistent with the relationship. An explanation of the relationship could be given as that the decrease in pores causes the compactness of the SSPB to increase, correspondingly, the bulk density increases.…”

Section: F I G U R Esupporting

confidence: 88%

An eco‐friendly permeable brick with excellent permeability and high strength derived from steel slag wastes

Lin

et al. 2019

Utilisation of industrial solid wastes to prepare products with high added value is an effective way that could relieve environmental pollution and create huge economic benefits. In this work, steel slag based permeable brick (SSPB) was successfully prepared by liquid phase sintering. The BSE-EDS results indicate that the microstructure of the SSPB becomes dense because of the formation of a small amount of glass-liquid phase (Na-K-Ca-Fe-Si-O glass system). The effect of sintering temperature on various properties of the SSPB was systematically studied. It is found that as the sintering temperature increases from 1210 to 1300°C, the permeability deceases gradually, as well as the apparent porosity, water retention and water absorption.In contrast, the bulk density and mechanical strengths show gradually increasing trends. Most important of all, the SSPB sintered at 1270°C for 1 hour shows an excellent permeability (5.70 × 10 −2 cm/s) and high mechanical strengths (compressive strength, 36.6 MPa; bending strength, 6.8 MPa). The prepared SSPB is not only likely to be a new type of permeable brick for sidewalk construction, but also relieve greatly environmental pollution from steel slag because of the high utilisation rate of steel slag (as high as 90%). K E Y W O R D Sglass-liquid phase, mechanical strengths, permeability, permeable brick, steel slag

“…They are known for their high melting point, excellent temperature chemical stability, and high creep resistance 126 . Furthermore, they exhibit a low coefficient of expansion, low thermal conductivity, and impressive temperature creep characteristics 127,128 . As temperature increases, both the flexural strength and fracture toughness of mullite ceramics improve, a feature that has garnered considerable attention.…”

Section: Mechanochemical Synthesis Of Oxide Ceramic Powdersmentioning

confidence: 99%

Mechanochemical synthesis of nanostructured and composite oxide ceramics: From mechanisms to tailored properties

Zhang,

Xu,

Zhang

et al. 2023

Mechanochemical synthesis is a technology formed in the 1950s. By applying mechanical energy, mechanochemical synthesis stimulates chemical reactions, causing structural and phase changes and enabling difficult or otherwise impossible reactions to occur. Mechanochemical reactions are relatively safe, clean and efficient. At present, the synthesis of oxide ceramic materials by mechanochemical methods has attracted widespread attention. In the production of oxide ceramic materials, the characteristics of ceramic powder have a certain influence on the molding, sintering, microstructure, and mechanical properties of subsequent ceramics. In this paper, the research progress of mechanical chemistry in the synthesis of nanostructures and composite oxide ceramic powders is reviewed. The effects of process parameters such as ball milling time, speed, atmosphere, grinding media, additives, and ball‐to‐powder ratio on reaction kinetics, phase formation, and powder properties are summarized. In addition, challenges and opportunities for ceramic powder synthesis are also discussed.