Porous ceramic material preparation method with intrinsic pore formation

A porous ceramic and pore-forming technology, which is applied in ceramic products, applications, household appliances, etc., can solve the problem of high compressive strength, and achieve the effects of easy operation, simple preparation process, and convenient performance

Active Publication Date: 2018-11-06
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The porosity of the finished product can reach 46.7%, but the highest compressive strength is only 16MPa

Method used

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  • Porous ceramic material preparation method with intrinsic pore formation
  • Porous ceramic material preparation method with intrinsic pore formation
  • Porous ceramic material preparation method with intrinsic pore formation

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preparation example Construction

[0028] The invention provides a method for preparing an intrinsically pore-forming porous ceramic material.

[0029] In the method, firstly, the raw materials are mixed and batched without adding a pore-forming agent; then, a green body is processed according to a traditional ceramic preparation method; finally, a porous ceramic material is obtained through drying and sintering.

[0030] The traditional ceramic sintering process is mainly divided into two types: solid phase sintering and liquid phase sintering, and the sintering process is relatively complicated. The sintering process can be divided into three stages: the first stage belongs to the stage of mineral loss of volatile matter, decomposition and crystal phase reaction, and some chemical reactions mainly occur, resulting in some mineral phase transformation; the second stage belongs to the densification stage, in which there will be Accompanied by the generation of liquid phase and the further reaction of crystal ph...

Embodiment 1

[0035] Refining slag, Laiyang soil, pyrophyllite, and quartz are used as raw materials, and the crystal phase does not contain pyroxene phase. The chemical composition of the ceramic prepared after the raw materials are mixed is 17.08%, and the content of CaO is 17.08%. 2 61.52%, MgO 3.69%, Al 2 o 3 9.54%, Fe 2 o 3 0.72%, Na 2 O+K 2 O is 1.81%. The mixed raw materials are traditionally ground, granulated, dried, and shaped to obtain a green body. The green body is dried and sintered. The firing temperature is 1080°C, which is 50°C lower than the firing temperature. The obtained ceramic material has a flexural strength of 23.07Mpa, a water absorption rate of 23.56%, a porosity of 38.12%, and an average pore diameter of 3.18 μm. It is a porous ceramic material with high strength, and its crystal phase contains a pyroxene phase. Its SEM photo, the obtained porous ceramic material pore size distribution and firing temperature are determined as follows figure 1 , figure 2 ...

Embodiment 2

[0037] Refining slag, Laiyang soil, pyrophyllite, and quartz are used as raw materials, and the crystal phase does not contain pyroxene phase. The chemical composition of the ceramic prepared after the raw materials are mixed is 17.08%, and the content of CaO is 17.08%. 2 61.52%, MgO 3.69%, Al 2 o 3 9.54%, Fe 2 o 3 0.72%, Na 2 O+K 2 O is 2.81%, and the difference from Example 1 is the external doping of 1% Na 2O (added in the form of soda ash). The mixed raw materials are traditionally ground, granulated, dried, and shaped to obtain a green body, which is then dried and sintered at a firing temperature of 1020°C, which is 50°C lower than the firing temperature. The obtained ceramic material has a compressive strength of 51.2 MPa, a water absorption rate of 23.58%, a porosity of 37.77%, and an average pore diameter of 1.27 μm. It is a porous ceramic material with high strength, and its crystal phase contains a pyroxene phase.

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Abstract

The invention provides a porous ceramic material preparation method with intrinsic pore formation and belongs to the technical field of solid waste comprehensive utilization. The method comprises thefollowing steps of mixing different raw materials according to the mass percentage without adding a pore-forming agent, processing a mixture into a green body according to the traditional ceramic preparation method, and performing drying and sintering to acquire a porous ceramic material. The raw materials do not include a pyroxene crystal phase; a chemical composition of the ceramic material prepared after mixing of the raw materials is as follows: SiO2 is larger than 35 percent and smaller than 65 percent, CaO is larger than 10 percent and smaller than 30 percent, Al2O3 is larger than 3 percent and smaller than 31 percent, MgO is larger than 3 percent and smaller than 20 percent, Fe2O3 is larger than 0 percent and smaller than 10 percent, and Na2O+K2O is larger than 0 percent and smallerthan 3 percent; and the sintering temperature is in a range from 1020 DEG C to 1260 DEG C. The porous ceramic material preparation method provided by the invention is simple in technology and liableto control and is an effective way of producing the porous ceramic material; and the porous ceramic material can be used as functional materials with a function of adsorption or filtering, various carrier materials or functional building materials and is widely applied.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of solid waste, in particular to a method for preparing an inherently pore-forming porous ceramic material. Background technique [0002] my country is a country with serious environmental pollution, among which water pollution and air pollution are important areas of concern. In the next few years, the environmental protection industry will have a very large demand for materials related to dust, harmful gas adsorption, and sewage filtration. [0003] Porous ceramics are a new type of functional material with a certain size and number of pore structures, which combine the high specific surface area of ​​porous materials with the physical and chemical stability of ceramic materials. The porous ceramic filter material is composed of a large number of crystal grains and a large number of open three-dimensional interconnected pores, which endows the filter material with good filtera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/18C04B35/622C04B38/00
CPCC04B35/18C04B35/62204C04B38/0074C04B2235/3201C04B2235/3206C04B2235/3208C04B2235/3272C04B2235/96C04B35/14C04B38/0054
Inventor 李宇盛红健
Owner UNIV OF SCI & TECH BEIJING
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