Facile fabrication of cordierite-based porous ceramics with magnetic properties

Abstract

In this paper, cordierite-based porous ceramics with magnetic properties have been firstly in-situ synthesized by using MgO, Al2O3, and SiO2 powders as raw materials and Fe3O4 as a functional additive. Combining with the foam freeze casting method, near net size fabrication (total linear shrinkage < 2.86%) of the magnetic porous materials was realized by adjusting the amount of Fe3O4. The porosity, compressive strength, and saturation magnetization of the prepared materials were 83.9%–87.8%, 1.51–2.65 MPa, and 1.2–5.8 emu/g, respectively. The phase composition and microstructure evolutions during sintering were investigated briefly. The results showed that the synthesis temperature of cordierite was lowered about 100 °C due to the addition of Fe3O4. Except for the main phase-cordierite, Mg—Al—Fe spinel and α-Fe2O3 also existed in the final materials. The lattice parameters of the Mg—Al—Fe spinel and the amount of α-Fe2O3 changed obviously with the change in the sintering temperature and Fe3O4 amount, which mainly influenced the magnetic properties of the prepared materials. Thus, a facile fabrication method of the cordierite-based porous ceramics with the magnetic properties has been put forward in this paper.

Fabrication and application of porous materials made from coal gangue: A review

“…Porous ceramics are widely used for fireproof, building, catalysis, and filtration applications because of their high melting point, relatively low density for engineering materials, low linear thermal expansion coefficient, high strength and hardness, and good corrosion resistance. 83 To date, various solid wastes, such as sludge, 84 red mud, 85 and fly ash, 86 have been used to produce ceramics. CG is rich in Al 2 O 3 and SiO 2 , which are beneficial for the production of silicoaluminate ceramics.…”

Microstructures and mechanical properties of B4C–SiC and B4C–SiC–TiB2 ceramic composites fabricated by hot pressing

“…Cordierite (magnesium aluminum silicate [MAS]) microcrystalline glass is an advanced glass–ceramic, which exhibits high dense density, high strength, and low melting point (1460°C), and thus can be considered a liquid phase sintering additive 18–23 . The main components of the MAS glass ceramic are α‐cordierite (Mg 2 Al 4 Si 5 O 18 ), mullite (Al 6 Si 2 O 13 ), forsterite (Mg 2 SiO 4 ), spinel (MgAl 2 O 4 ), sapphirine (Mg 4 Al 10 Si 2 O 23 ), and quartz (SiO 2 ) 24,25 .…”

Quasi‐synchronous solid‐state reaction for cordierite powder synthesis

“…The β-cordierite will transform to α-cordierite 19 (Equation 5) at temperatures above 1300 • C. And the spinel reacts with SiO 2 at 1350 • C to form α-cordierite 20 (Equation 6).…”

“…The β‐cordierite will transform to α‐cordierite 19 (Equation ) at temperatures above 1300°C. And the spinel reacts with SiO 2 at 1350°C to form α‐cordierite 20 (Equation ). $$$$\begin{equation}{\mathrm{\beta - }}{\mathrm{Cordierite}} \to {\mathrm{\alpha}} - {\mathrm{Cordierite}}\end{equation}$$$$ $$$$\begin{equation}{\mathrm{2Spinel}} + {\mathrm{5Si{O}_2}} \to {\mathrm{\alpha}} - {\mathrm{Cordierite}}\end{equation}$$$$…”