Artificial nacre material with layered structure and preparation method thereof

Patent metadata

Field	Value
Publication number	US-11267721-B2
Application number	US-202117241339-A
Country	US
Kind code	B2
Filing date	Apr 27, 2021
Priority date	Apr 29, 2020
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

The invention discloses an artificial nacre material with layered structure and preparation method thereof. The preparation method includes the following steps: uniformly mixing a carbonated cementitious material and water at a water-solid ratio of 0.3 to 1.2 to obtain a carbonated cementitious material suspension; treating the carbonated cementitious material suspension by a freeze-casting process to obtain a carbonated cementitious material coagulation with layered structure; treating the carbonated cementitious material coagulation with the layered structure by a freeze-drying process to obtain a carbonated cementitious material with layered structure; treating the carbonated cementitious material with layered structure by a carbonization process to obtain an artificial nacre material with layered structure. The obtained artificial nacre material with layered structure has higher fracture toughness and durability, and the preparation method has the advantages of low energy consumption, carbon dioxide fixation and environmental friendliness.

First claim

What is claimed is:

1. A preparation method of an artificial nacre material with layered structure, comprising the following steps:
uniformly mixing a carbonated cementitious material and water at a water-solid ratio of 0.3 to 1.2 to obtain a carbonated cementitious material suspension, wherein the carbonated cementitious material is one or more of gamma dicalcium silicate, monocalcium silicate, steel slag, and tricalcium disilicate;
treating the carbonated cementitious material suspension by a freeze-casting process to obtain a carbonated cementitious material coagulation with layered structure;
treating the carbonated cementitious material coagulation with the layered structure by a freeze-drying process to obtain a carbonated cementitious material with layered structure;
treating the carbonated cementitious material with layered structure by a carbonization process to obtain an artificial nacre material with layered structure.

2. The preparation method of an artificial nacre material with layered structure according to claim 1 , wherein a water-solid ratio of the carbonated cementitious material suspension is 1.

3. The preparation method of an artificial nacre material with layered structure according to claim 1 , wherein the specific freeze-casting process is as follows: placing the prepared carbonated cementitious material suspension in a freeze-casting machine for unidirectional freezing; specifically, cooling down from 20˜35° C. to −90˜−30° C. at a freezing rate of 1 to 10° C./min and an entire freezing time is 0.5˜5 h.

4. The preparation method of an artificial nacre material with layered structure according to claim 1 , wherein the specific freeze-drying process is as follows: placing the carbonated cementitious material coagulation with layered structure in a freeze-casting machine for freezing; specifically, a freeze-drying temperature is −20˜−5° C., a freeze-drying time is 6˜12 h, and a vacuum degree is −0.1˜−0.05 MPa.

5. The preparation method of an artificial nacre material with layered structure according to claim 1 , wherein the specific carbonization process is as follows: placing the carbonated cementitious material with layered structure in an environment with both water vapor and carbon dioxide gas for carbonization.

6. The preparation method of an artificial nacre material with layered structure according to claim 5 , in the carbonization process, a mass concentration of carbon dioxide is 40˜99.9%, a volume ratio of carbon dioxide to water vapor is (10˜20):1, a relative humidity is 5˜20%, an air pressure is 0.1˜0.5 MPa, an initial carbonization temperature is 5˜30° C. and a carbonization time is 2˜8 h.

7. The preparation method of an artificial nacre material with layered structure according to claim 1 , wherein the carbonated cementitious material is one or more of gamma dicalcium silicate, monocalcium silicate, and tricalcium disilicate.

8. An artificial nacre material with layered structure, wherein the artificial nacre material with layered structure is prepared by the preparation method of an artificial nacre material with layered structure according to claim 1 .

Assignees

• Univ Wuhan Tech

Inventors

• Wang Fazhou
• Liu Zhichao
• Lei Ming
• Hu Shuguang

Classifications

• C04B40/024

  Steam hardening, e.g. in an autoclave · CPC title

• C04B40/0236

  Carbon dioxide post-treatment of already hardened material · CPC title

• C04B2111/54

  Substitutes for natural stone, artistic materials or the like · CPC title

• C04B2201/52

  High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC] · CPC title

• C04B28/188

  the Ca-silicates being present in the starting mixture · CPC title