Method for preparing magnesium borate whisker porous ceramic by employing in-situ growth

A technology of magnesium borate whiskers and porous ceramics, which is applied in the field of in-situ growth and preparation of magnesium borate whiskers porous ceramics, can solve the problems of whisker adhesion and high-temperature sintering of porous ceramics, and achieve increased strength, reduced material cracking, high The effect of intensity

Inactive Publication Date: 2014-03-12
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Abstract
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  • Application Information

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Problems solved by technology

[0020] One of the purposes of the present invention is to provide a method for preparing magnesium borate whisker porous ceramics by in-situ growth, which solves the existing method for preparing magnesium borate whisker on the one hand. The problem of adhesion between the prepared whiskers, on the other hand, solves the problem that the preparation of porous ceramics requires high temperature sintering

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  • Method for preparing magnesium borate whisker porous ceramic by employing in-situ growth
  • Method for preparing magnesium borate whisker porous ceramic by employing in-situ growth
  • Method for preparing magnesium borate whisker porous ceramic by employing in-situ growth

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[0043] A method for preparing magnesium borate whisker porous ceramics by in-situ growth. The preparation method uses inorganic magnesium salt and boric acid as raw materials, uses inorganic nitrate as catalyst, mixes materials through low-temperature ball milling, and then presses the mixed powder into blanks. Roasting carries out phase conversion, washing, drying, and makes magnesium borate whisker porous ceramics, the specific steps are as follows:

[0044] In step 1, the inorganic magnesium salt and boric acid are mixed according to the Mg:B molar ratio of 1:0.5-1:3 and 1%-10% mass fraction of nitrate mixed powder to obtain prefabricated powder. In this process, the mixed powder of inorganic magnesium salt, boric acid and nitrate is put into an agate ball mill jar and milled using a planetary ball mill with a rotational speed of 250-350r / min and a milling time of 6-10 hours.

[0045] In step 2, the above-mentioned prefabricated powder is compressed into a billet with a dia...

Embodiment 1

[0049] Put 9g of boric acid, 11g of basic magnesium carbonate and nickel nitrate of 5% mass fraction in a ball mill jar for ball milling for 10 hours, then press it into a sheet-shaped billet with a diameter of 10mm, place the billet in a quartz crucible, and place the quartz The crucible was placed in a box-type high-temperature furnace. First, it was raised to 700°C at a constant temperature of 5°C / min for 1 hour, then raised to 800°C for 4 hours to grow whiskers, and then allowed to cool naturally to room temperature to obtain crystals. Magnesium borate whisker porous ceramics with a whisker diameter of 0.5 μm, an average length of 1-2 μm, a compressive strength of 5 MPa, and a porosity of 40%.

Embodiment 2

[0051] Put 10g boric acid, 10g basic magnesium carbonate and 5% ferric nitrate in a ball mill jar for ball milling for 10 hours, then press it into a sheet-shaped billet with a diameter of 10mm, place the billet in a quartz crucible, and place the quartz The crucible was placed in a box-type high-temperature furnace, first raised to 700 °C at a constant temperature of 5 °C / min for 1 hour, then raised to 900 °C for 4 hours to grow whiskers, and then allowed to cool naturally to room temperature to obtain crystals. Magnesium borate whisker porous ceramics with a whisker diameter of 0.4 μm, an average length of 2-5 μm, a porosity of 45%, and a compressive strength of 10 MPa.

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Abstract

The invention discloses a method for preparing magnesium borate whisker porous ceramic by employing in-situ growth. The method comprises the following steps: with an inorganic magnesium salt and boric acid as raw materials, and inorganic nitrate as a catalyst, mixing the raw materials in a ball-milling manner, and then pressing the mixed powder to form a blank; carrying out phase transformation by adopting a high-temperature roasting mode; and washing and drying, so as to prepare the magnesium borate whisker porous ceramic. In the procedure of mixing the raw materials in the ball-milling manner, the magnesium salt and the boric acid are mixed according to a molar ratio of Mg to B being 1:0.5 to 1:3, and the mass content of the nitrate is 1-10% of total content of the mixed materials. Compared with the prior art, the method for preparing the magnesium borate whisker porous ceramic by employing in-situ growth, which is disclosed by the invention has the advantages that on one hand, the adhesion problem among whiskers prepared by an existing method for preparing the magnesium borate whisker is solved, and on the other hand, the problem that high-temperature sintering is required in preparation of the porous ceramic is solved.

Description

technical field [0001] The invention relates to a preparation of ceramics, in particular to a method for preparing magnesium borate whisker porous ceramics by in-situ growth. Background technique [0002] Porous ceramics have excellent properties such as high porosity, high temperature resistance, chemical corrosion resistance, and good thermal stability. They are mostly used as liquid metal filters, high-temperature gas and ion exchange filters, catalyst carriers, etc., and are widely used in metallurgy, chemical industry, etc. , light industry, food, environmental protection, energy saving and other fields. [0003] Magnesium borate whiskers (Mg 2 B 2 o 5 ) is a cheap whisker material developed in recent years. It is cheap, has the advantages of light weight, high strength, high toughness, wear resistance, high temperature resistance, good insulation, and corrosion resistance. It can be applied to the preparation of aluminum, magnesium, etc. Alloys and polymer matrix c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/81C04B35/01C04B35/622
Inventor 陈善华张达富孙刚邹旋蒋涛
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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