Preparation method of large size MAX phase ceramic impeller

A large-scale, impeller technology, applied in the field of material preparation, can solve the problems of structural material use requirements, reduced LBE corrosion resistance, reduced mechanical properties, etc., and achieves the effect of meeting service requirements and eliminating bubble inclusions

Active Publication Date: 2019-10-15
UNIV OF SCI & TECH BEIJING
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  • Claims
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Problems solved by technology

However, Ti prepared by this method 3 SiC 2 Ceramics contain a large amount of unreacted free silicon, which affects the high-temperature mechanical properties and LBE corrosion resistance of the material, and cannot be used as an impeller for nuclear reactor coolant circulation pumps
Mrinalini's article "Textured Ti 3 SiC 2 bygelcasting in a strong magnetic field” reported that Ti 3 SiC 2 Green body, however, ceramic green body is not sintered, its mechanical properties cannot meet the requirements of structural materials, and it cannot be used as impeller material for pumps
A.Idzkowska's article "Deflocculation and stabilization of Ti 3 SiC 2 "ceramic powder in gelcasting process" adopts the gel injection molding process to prepare a green body with a bending strength of 1.5MPa, but this strength cannot meet the requirements of pump impeller materials
The paper "Microstructure and Mechanical Properties of Gel Casted Ti3AlC2" published by scholar Hu Chunfeng reported that Ti 3 AlC 2 gel injection molding of ceramics, however, Ti 3 AlC 2 The surface layer of the sample is decomposed, resulting in a decrease in LBE corrosion resistance. At the same time, the low density leads to a decrease in mechanical properties, which cannot meet the material performance requirements of the nuclear power reactor LBE coolant pump impeller.
The paper "Ti 2 AlC foams produced by gel-casting" reported Ti 2 Gel injection molding of AlC foam ceramics, however, Ti 2 Because AlC foam ceramics contain a large number of bubbles inside, the mechanical properties of the pump impeller as a structural material are greatly reduced, and it cannot meet the material performance requirements of the nuclear power stack LBE coolant pump impeller.

Method used

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  • Preparation method of large size MAX phase ceramic impeller

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Such as figure 1 Shown, a kind of large-scale MAX phase ceramic impeller preparation method, its specific steps are as follows:

[0050] (1) Preparation of Ti by combustion synthesis method 3 SiC 2 Micropowder;

[0051] (2) Add monomers, crosslinking agents, dispersants, and defoamers into deionized water to form a premix;

[0052] (3) the Ti described in step (1) 3 SiC 2 The micropowder is added to the premix described in step (2), and mixed by ball milling to obtain an injection molding slurry;

[0053] (4) placing the injection molding slurry described in step (3) in a vacuum environment to remove air bubbles mixed in the slurry;

[0054] (5) Initiator, polymerization inhibitor, catalyst are added in the slurry after removing bubble described in step (4), stir;

[0055] (6) Pouring the slurry described in step (5) into the impeller mold in a vacuum environment, and maintaining the negative pressure until the slurry boils, and discharging the entrained air bubb...

Embodiment 2

[0084] Such as figure 1 Shown, a kind of large-scale MAX phase ceramic impeller preparation method, its specific steps are as follows:

[0085] (1) Preparation of Ti by combustion synthesis method 3 AlC 2 Micropowder;

[0086] (2) Add monomers, crosslinking agents, dispersants, and defoamers into deionized water to form a premix;

[0087] (3) the Ti described in step (1) 3 AlC 2 The micropowder is added to the premix described in step (2), and mixed by ball milling to obtain an injection molding slurry;

[0088] (4) placing the injection molding slurry described in step (3) in a vacuum environment to remove air bubbles mixed in the slurry;

[0089] (5) Initiator, polymerization inhibitor are added in the slurry after removing bubble described in step (4), stir;

[0090] (6) Pouring the slurry described in step (5) into the impeller mold in a vacuum environment, and maintaining the negative pressure until the slurry boils, and discharging the entrained air bubbles. After t...

Embodiment 3

[0118] Such as figure 1 Shown, a kind of large-scale MAX phase ceramic impeller preparation method, its specific steps are as follows:

[0119] (1) Preparation of Ti by combustion synthesis method 2 AlC powder;

[0120] (2) Add monomers, crosslinking agents, dispersants, and defoamers into deionized water to form a premix;

[0121] (3) the Ti described in step (1) 2 AlC micropowder is added in the premix described in step (2), and the ball mill is mixed evenly to obtain the injection molding slurry;

[0122] (4) placing the injection molding slurry described in step (3) in a vacuum environment to remove air bubbles mixed in the slurry;

[0123] (5) Initiator, polymerization inhibitor are added in the slurry after removing bubble described in step (4), stir;

[0124] (6) Pouring the slurry described in step (5) into the impeller mold in a vacuum environment, and maintaining the negative pressure until the slurry boils, and discharging the entrained air bubbles. After the a...

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Abstract

The invention provides a preparation method of a large size MAX phase ceramic impeller. The preparation method is capable of preparing the large size MAX phase ceramic impeller with complex shape characteristics. According to the preparation method, gel injection moulding technology is adopted, argon gas and A-enriched atmosphere are introduced as sintering protection atmosphere, and pressurelesssolid-phase sintering of MAX phase ceramic impeller is carried out. The preparation method comprises following steps: ceramic slurry preparation, mould injection, demoulding, drying, green compact processing, degumming, pressureless sintering, and polishing and refining. The preparation method is capable of solving difficult technological problems in the prior art that settlement is easily causedbecause of large MAX ceramic slurry density, and cracking and deformation are easily caused in drying and sintering process; and successive preparation of the large size MAX phase ceramic impeller isrealized at last. The large size MAX phase ceramic impeller possesses excellent corrosion resistance, irradiation resistance, wear resistance, oxidation resistance, and high temperature resistance, and can be widely used in the fields of nuclear power, chemistry, metallurgy, oil field, and thermal power.

Description

technical field [0001] The invention relates to a method for preparing a large-size MAX-phase ceramic impeller, which belongs to the technical field of material preparation, and specifically relates to a method for preparing a MAX-phase ceramic impeller based on gel injection molding and pressureless sintering. The prepared impeller has a large size, Complicated shape and technical characteristics of corrosion resistance, radiation resistance, wear resistance, oxidation resistance and high temperature resistance. Background technique [0002] Centrifugal pumps are indispensable equipment for transporting fluids in nuclear energy, chemical industry, metallurgy, oil fields, mining, thermal power and other industries, and the impeller is the core flow-through component of centrifugal pumps for transporting liquids. In order to reliably pump high-temperature, high-irradiation, high-corrosion, high-wear and other special fluids, it is necessary for the impeller to withstand radia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/622
CPCC04B35/5607C04B35/5615C04B35/5618C04B35/622C04B2235/5445C04B2235/6022C04B2235/606C04B2235/612C04B2235/656C04B2235/6567C04B2235/658C04B2235/77C04B2235/94C04B2235/95C04B2235/96
Inventor 燕青芝赵占冲
Owner UNIV OF SCI & TECH BEIJING
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