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A kind of b-al-ti series composite phase ceramics and its low-temperature densification sintering preparation method

A composite ceramic, b-al-ti technology, applied in the field of boride ceramics, can solve the problems of sintering and preparation of boride ceramics, the decrease of the strength of sintered samples, and the limitation of application prospects, etc., to achieve low-temperature densification and reduce sintering Difficulty, the effect of lowering the sintering temperature

Active Publication Date: 2021-07-27
WUHAN UNIV OF TECH
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Problems solved by technology

However, its application prospects are severely limited due to its difficulty in sintering and compactness, the need for high sintering temperature, and the high cost of preparation.
[0003] Boride ceramics is a potential structural material. In recent years, people have carried out a lot of work on the preparation of high-performance boride ceramics. In the preparation methods of various boride ceramics reported in the literature, in order to ensure the mechanical properties of ceramics, the pursuit of more High density, the sintering temperature is mostly higher than 1900 ℃, too high sintering temperature has brought great trouble to the sintering preparation of boride ceramics, in order to reduce the sintering temperature of boride ceramics, people are constantly looking for new sintering aids , try advanced sintering process, but there are always various defects
For example, adding a low-melting-point metal to provide a sintering liquid phase to promote the sintering of boride ceramics can indeed effectively reduce the sintering temperature and promote sintering density, but the presence of a low-melting-point metal will lead to a decrease in the strength of the sintered sample

Method used

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  • A kind of b-al-ti series composite phase ceramics and its low-temperature densification sintering preparation method
  • A kind of b-al-ti series composite phase ceramics and its low-temperature densification sintering preparation method
  • A kind of b-al-ti series composite phase ceramics and its low-temperature densification sintering preparation method

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preparation example Construction

[0029] like figure 1 Shown is the process flow diagram of the present invention for preparing B-Al-Ti composite phase ceramics, and its low-temperature densification and sintering preparation method comprises the following steps:

[0030] (a) Mix B powder, Al powder and Ti powder evenly, wherein the molar ratio x:y of Al powder and Ti powder is (1-9):1, and the molar weight of B powder is 12x+2y;

[0031] (b) prefabricating the green body by cold pressing the mixture in the step (a);

[0032] (c) performing plasma activation sintering on the green body prepared in step (b), and obtaining B-Al-Ti multiphase ceramics under the sintering condition of 1460-1600°C.

[0033] In powder metallurgy engineering, the particle size of the raw material powder will greatly affect the structure and performance of the final sintered product. The smaller the particle size of the raw material powder, the greater its surface driving force and the higher the activation energy provided during th...

Embodiment 1

[0045] To prepare high-performance B-Al-Ti composite phase ceramics, the preparation process is followed by powder weighing, powder mixing, cold pressing into blanks and in-situ reaction sintering, and the B-Al-Ti composite phase ceramics are obtained after sintering. The specific steps are as follows:

[0046] 1. Weighing and mixing

[0047] Take by weighing 99% purity, 10.81g of B powder with a particle size of 0.5-1μm, 2.21g of Al powder with a particle size of 1-3μm and 0.44g of Ti powder with a particle size of 2-5μm (according to B-Al- AlB in Ti-based composite ceramics 12 with TiB 2 The molar ratio is 9:1), and the mixed powder is freeze-dried for 24 hours by freeze-drying equipment, and then mixed uniformly by using a low-energy ball mill for 6 hours to obtain the mixed powder.

[0048] 2. Cold forming

[0049] Take 3g of the mixed powder obtained in step 1 and put it into a 304L mould, and use a tablet press to perform cold compression molding (pressure 30MPa), an...

Embodiment 2

[0060] To prepare high-performance B-Al-Ti composite phase ceramics, the preparation process is followed by powder weighing, powder mixing, cold pressing into billets and in-situ reaction sintering. After the sintering is completed, the B-Al-Ti composite phase ceramics are obtained. The specific steps are as follows:

[0061] 1. Weighing and mixing

[0062] Take by weighing 99% purity, 10.81g of B powder with a particle size of 0.5-1μm, 1.89g of Al powder with a particle size of 1-3μm and 3.35g of Ti powder with a particle size of 2-5μm (according to B-Al- AlB in Ti-based composite ceramics 12 with TiB 2 The molar ratio is 1:1), and the mixed powder is freeze-dried for 24 hours by freeze-drying equipment, and then mixed uniformly by using a low-energy ball mill for 6 hours to obtain a mixed powder.

[0063] 2. Cold forming

[0064] Take 3g of the mixed powder obtained in step 1 and put it into a 304L mould, and use a tablet press to perform cold compression molding (press...

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Abstract

The invention discloses a B-Al-Ti series composite ceramic and a preparation method thereof by low-temperature densification and sintering. The main phase composition of the composite ceramic is AlB 12 and TiB 2 , where AlB 12 and TiB 2 The molar ratio is (1‑9):1. Its preparation is as follows: (a) weighing raw materials B powder, Al powder and Ti powder and mixing them uniformly; (b) forming a prefabricated green body by cold pressing; (c) performing plasma activation sintering on the green body prepared in step (b), B-Al-Ti composite phase ceramics were obtained at 1460-1600°C. The sintering temperature of the method is low, the sintering efficiency can be improved, the sintering cost can be reduced, and the density of the sintered block is low, the compactness is good, and the mechanical performance is good. The composite ceramic has the characteristics of light weight and high strength, and can be used in stress wave protection, nuclear industry, aerospace and other fields.

Description

technical field [0001] The invention belongs to the technical field of boride ceramics, and in particular relates to a B-Al-Ti series multiphase ceramic and a preparation method thereof by low-temperature densification and sintering. Background technique [0002] Boride ceramic materials have the characteristics of high melting point, high hardness, high strength, and chemical stability. They are often used as cutting tools, rocket nozzles, military armor, and stress wave protection materials. They are used in stress wave protection, nuclear industry and aerospace. Wide range of applications. However, its application prospects are severely limited due to its difficulty in sintering and compactness, the need for high sintering temperature, and the high cost of preparation. [0003] As a structural material with great potential, boride ceramics have carried out a lot of work on the preparation of high-performance boride ceramics in recent years. In the preparation methods of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/58C04B35/65C04B35/622
CPCC04B35/5805C04B35/622C04B35/65C04B2235/3813C04B2235/656C04B2235/6581C04B2235/666C04B2235/77C04B2235/96
Inventor 罗国强范鹏孙一沈强张联盟张建
Owner WUHAN UNIV OF TECH
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