CN-121717649-B - High-toughness foamed ceramic and preparation method and application thereof

Abstract

The invention provides a high-toughness foamed ceramic, a preparation method and application thereof, wherein the raw materials are firstly ground and uniformly mixed, then water is added and uniformly mixed to obtain wet powder, the wet powder is tiled into a grinding tool and subjected to magnetic field and temperature field coupling sintering, and the raw materials comprise, by weight, 50-70 parts of steel slag powder, 0-20 parts of fly ash, 5-20 parts of phosphate tailings, 5-20 parts of red mud, 5-20 parts of waste incineration ash, 5-20 parts of waste glass powder and 0.1-0.5 part of boron nitride.

Inventors

• JING QUAN
• PENG WENJIE
• CHEN WEI
• LI BO
• LI JINGWEI
• ZHANG YINAN
• ZHENG XUHANG
• CHEN FEI

Assignees

• 中国建筑设计研究院有限公司

Dates

Publication Date

20260508

Application Date

20260225

Claims (5)

1. 1. A method for preparing high-toughness foamed ceramic comprises the steps of grinding and uniformly mixing raw materials, adding water and uniformly mixing to obtain wet powder, spreading the wet powder into a die, and performing magnetic field and temperature field coupling sintering, and is characterized in that the raw materials comprise, by weight, 50-70 parts of steel slag powder, 0-20 parts of fly ash, 5-20 parts of phosphate tailings, 5-20 parts of red mud, 5-20 parts of waste incineration ash, 5-20 parts of waste glass powder and 0.1-0.5 part of boron nitride, wherein the magnetic field is a directional constant magnetic field, the magnetic field strength is 1-4T, the temperature field is 1200 ℃ and the heat preservation time is 6-8h.
2. 2. The method of high toughness ceramic foam according to claim 1, wherein the mass ratio of powder to water is 100:15.
3. 3. The method of high toughness ceramic foam according to claim 1, wherein the sintering atmosphere is a weak reducing gas atmosphere.
4. 4. A high toughness ceramic foam prepared by the method of any one of claims 1 to 3.
5. 5. Use of the high toughness ceramic foam according to claim 4 for manufacturing marine large floating body structural equipment.

Description

High-toughness foamed ceramic and preparation method and application thereof Technical Field The invention relates to the technical field of inorganic nonmetallic materials, in particular to high-toughness foamed ceramic, and a preparation method and application thereof. Background With the continuous promotion of ocean resource development, the requirements of large floating body structures such as ocean fishing farm cultivation platforms, floating offshore wind power facilities and the like are increased. The engineering has strict requirements on the buoyancy tank material, namely light weight, corrosion resistance, impermeability and long-term service stability. The traditional concrete buoyancy tank has the defects of large self weight and easiness in cracking and leakage, the metal base material is faced with the problems of seawater corrosion and biological adhesion, and the polymer composite material has the bottlenecks of poor creep resistance, easiness in aging and short service life. Foamed ceramics are regarded as potential materials of a new generation of buoyancy tanks because of excellent buoyancy characteristics, chemical corrosion resistance and high thermal stability caused by a lightweight porous closed-cell structure. However, the brittleness of the existing foamed ceramics is large, the fracture toughness is generally lower than 1.5 MPa.m 1/2, and the three-point bending strength is lower than 1 MPa. Brittle fracture is easy to generate under the action of ocean dynamic load (wave impact and mooring force alternation). Especially when the buoyancy tank unit size exceeds 10m ×5m ×3m, the microcracks within the material rapidly spread at the stress concentration sites, resulting in a significant increase in the risk of structural failure as a whole. Conventional ceramics may increase fracture toughness through fiber modification. The toughness of the foamed ceramic can be improved by fiber reinforcement (such as basalt fiber doping) or polymer composite modification in the prior art, but two technical bottlenecks exist, namely, in the high-temperature sintering process of the foamed ceramic, fibers can generate gas escape channels, the porosity of the foamed ceramic can be obviously reduced after the fibers are added, meanwhile, inorganic fibers (such as basalt fibers and corundum fibers) are also brittle materials, the combination of the inorganic fibers and a foamed ceramic matrix is weak, and the toughness of the foamed ceramic cannot be obviously improved. And when the organic fibers are adopted, the organic fibers are burnt and decomposed at high temperature, so that a fiber reinforced structure cannot be reserved, and the weather resistance of the material is reduced due to the fact that the organic fibers are compounded on the outer surface of the foamed ceramic, and interfacial stripping occurs in a seawater environment. Therefore, aiming at the 20-year service cycle requirement of marine engineering equipment, the development of the foamed ceramic with high toughness and performance stability becomes a key for breaking through the technical bottleneck of lightweight floating body structure. Disclosure of Invention In order to solve the technical problems, the invention provides high-toughness foam ceramic, and a preparation method and application thereof. The high-toughness foamed ceramic provided by the invention is prepared by grinding and uniformly mixing the raw materials, then adding water and uniformly mixing to obtain wet powder, spreading the wet powder into a grinding tool, and performing magnetic field and temperature field coupling sintering, wherein the raw materials comprise, by weight, 50-70 parts of steel slag powder, 0-20 parts of fly ash, 5-20 parts of phosphate tailings, 5-20 parts of red mud, 5-20 parts of waste incineration ash, 5-20 parts of waste glass powder and 0.1-0.5 part of boron nitride; In some possible embodiments, the magnetic field is a directionally constant magnetic field having a magnetic field strength of 1-4T. In some possible embodiments, the temperature field is a firing temperature of 1200 ℃ and the hold time is 6-8 hours. In some possible embodiments, the mass ratio of powder to water is 100:15. In some possible embodiments, the sintering atmosphere is a weakly reducing gas atmosphere. The invention also provides the high-toughness foam ceramic prepared by the method. The invention also provides application of the high-toughness foam ceramic, which is used for manufacturing marine large floating body structural equipment. Compared with the prior art, the invention has the beneficial effects that: 1. The Fe-O magnetic units are migrated and distributed along the directional magnetic field by utilizing the coupling effect of the magnetic field and the temperature field, so that the magnetic fibers are generated in situ. Adverse effects caused by externally added fibers are avoided, and in-situ toughening of the foamed ceramic is realized. 2.