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Processable complex-phase ceramic material and preparation method thereof as well as secondary hardening heat treatment method

A heat treatment method and technology of multi-phase ceramics, which are applied in the field of ceramic material manufacturing, can solve problems such as the contradiction between machinability and hardness, limit the application field of machinable ceramics, and cannot improve the hardness of machinable ceramics, so as to achieve short sintering time and high hardness , increased hardness and strength

Inactive Publication Date: 2011-01-26
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, many properties such as high hardness and the resulting wear resistance are the unique advantages of ceramic materials. With the improvement of processing performance, the hardness of machinable ceramics decreases. That is to say, machinability and hardness are one and the same. Contradictions, to a large extent limit the application of machinable ceramics
The hardness of ceramic materials is related to the content of its hard phase, and the hardness of machinable ceramics cannot be improved by simply changing the microstructure of the material

Method used

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  • Processable complex-phase ceramic material and preparation method thereof as well as secondary hardening heat treatment method
  • Processable complex-phase ceramic material and preparation method thereof as well as secondary hardening heat treatment method
  • Processable complex-phase ceramic material and preparation method thereof as well as secondary hardening heat treatment method

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preparation example Construction

[0022] The preparation method of the machinable composite ceramic material comprises the following steps: formulating the components according to the above weight percentages, ball-milling the mixed powder, and then sintering in a plasma activation (PAS) furnace, wherein the heating rate is 300-500° C. / min, and the pressure is 30- 50MPa, vacuum degree 6-10Pa, sintering temperature 900-1200℃, heat preservation for 2-4min, and finally cooling with furnace.

[0023] The secondary hardening heat treatment method of the machinable multiphase ceramic material, the machinable multiphase ceramic material prepared above is mechanically processed into a product, placed in a vacuum furnace, and heated in N 2 Under gas protection, the temperature is first raised to 900-1200°C at 5-10°C / min, then raised to 1600-1800°C at 2-5°C / min, kept for 2-3h, and finally cooled with the furnace.

Embodiment 1

[0025] Processable composite ceramic material ingredients: Al 2 O 3 It is the ceramic matrix phase, Al and h-BN are the toughening and reaction phases, and the weight percentage of each component is Al 2 O 3 60%, h-BN15%, Al25%.

[0026] Preparation of processable composite ceramic materials: Mix the above components, wet-mill in a ball mill for 24 hours, the medium is anhydrous ethanol (concentration 99.7%), the grinding balls are agate balls, dried at 70°C, and passed through a 200-mesh sieve ; Then, the h-BN / Al / Al 2 O 3 The powder is loaded into a graphite mold and placed in a plasma activation furnace. Plasma activation (PAS) is used for rapid primary sintering. During the primary sintering, the temperature is 1150°C, the heating rate is 300°C / min, the pressure is 30MPa, the vacuum degree is 10Pa, and the temperature is kept for 2min. The sintering process Using infrared temperature measurement, it can be obtained by cooling with the furnace.

[0027] Secondary harde...

Embodiment 2

[0030] Processable composite ceramic material ingredients: Al 2 O 3 It is the ceramic matrix phase, Al and h-BN are the toughening and reaction phases, and the weight percentage of each component is Al 2 O 3 75%, h-BN 10%, Al 15%.

[0031]Preparation of processable composite ceramic materials: Mix the above components, wet-mill in a ball mill for 24 hours, the medium is anhydrous ethanol (concentration 99.7%), the grinding balls are agate balls, dried at 70°C, and passed through a 200-mesh sieve ; Then put the h-BN / Al / SiC powder into the graphite mold, and put it into the plasma activation furnace, and the plasma activation (PAS) is rapidly sintered once. The primary sintering temperature is 1200℃, the heating rate is 400℃ / min, and the pressure is 40MPa. , the vacuum degree is 8Pa, the heat preservation is 4min, the sintering process adopts infrared temperature measurement, and finally it is obtained by cooling with the furnace.

[0032] Secondary hardening heat treatment ...

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Abstract

The invention relates to the field of ceramic material manufacture and discloses a processable complex-phase ceramic material and a preparation method thereof as well as a secondary hardening heat treatment method. The processable complex-phase ceramic material comprises the components of 40-80% of SiC, 5-30% of h-BN and 5-50% of Ti by weight. The preparation method comprises the steps of: preparing the components, carrying out ball-milling on the components to obtain mixed powder, and then sintering once in a plasma activated sintering (PAS) furnace to obtain a processable complex-phase ceramic material with relatively low hardness; and machining the prepared processable complex-phase ceramic material into a product, placing into a heat treatment furnace, and carrying out secondary hardening treatment in the presence of N2 gas shielding, therefore, the hardness of the product is enhanced and the application field of the product is enlarged.

Description

technical field [0001] The invention relates to the field of ceramic material manufacturing, in particular to a machinable composite ceramic material, a preparation method thereof, and a secondary hardening heat treatment method. Background technique [0002] Machinable ceramics usually refer to ceramic materials whose material removal rate and surface roughness can meet certain engineering requirements under the process conditions of traditional cutting technology without diamond tools. Generally, the surface roughness after processing is required to be less than 10 μm. At present, the preparation of machinable ceramics mainly uses some excellent toughening and reinforcement methods and composite methods to improve the mechanical properties of machinable ceramic materials through a reasonable combination of components, and to reconcile the contradiction between the machinability and strength of ceramic materials. For example, ceramic materials with good machinability and hi...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/622C04B35/64
Inventor 乔冠军贾祥亚施玉婷金海云王红洁杨建锋王继平高积强
Owner XI AN JIAOTONG UNIV
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