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

A heat treatment method and technology of multiphase ceramics, applied in the field of ceramic material manufacturing, can solve the problems of limiting the application field of machinable ceramics, the inability to improve the hardness of machinable ceramics, the contradiction between machinability and hardness, and achieve hardness improvement, hardness and strength The effect of increasing and shortening the sintering time

Inactive Publication Date: 2012-11-28
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

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

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preparation example Construction

[0022] A method for preparing a machinable multiphase ceramic material, comprising the following steps: according to the above weight percentages, the ingredients are distributed, the mixed powder is ball milled, and then sintered 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℃, keep warm for 2-4min, and finally cool with the furnace.

[0023] A secondary hardening heat treatment method for a machinable multiphase ceramic material. The machinable multiphase ceramic material prepared above is machined into a product, put into a vacuum furnace, and heated in N 2 Under gas protection, first raise to 900-1200°C at 5-10°C / min, then rise to 1600-1800°C at 2-5°C / min, keep warm for 2-3h, and finally cool with the furnace.

Embodiment 1

[0025] Machinable 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 ratio of each component is Al 2 o 3 60%, h-BN15%, Al25%.

[0026] Preparation of machinable composite ceramic material: Mix the above-mentioned components, wet mill them in a ball mill jar for 24 hours, the medium is absolute ethanol (concentration 99.7%), the balls are agate balls, dry at 70°C, and pass 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 rapidly sintered once. During the first sintering, the temperature is 1150°C, the heating rate is 300°C / min, the pressure is 30MPa, the vacuum degree is 10Pa, and the heat preservation is 2min. The sintering process Infrared temperature measurement is adopted, and it can be obtained after cooling with the furnace.

[0027] Secondary h...

Embodiment 2

[0030] Machinable 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 ratio of each component is Al 2 o 3 75%, h-BN10%, Al15%.

[0031]Preparation of machinable composite ceramic material: Mix the above-mentioned components, wet mill them in a ball mill jar for 24 hours, the medium is absolute ethanol (concentration 99.7%), the balls are agate balls, dry at 70°C, and pass 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, plasma activation (PAS) rapid primary sintering, the primary sintering temperature is 1200℃, the heating rate is 400℃ / min, and the pressure is 40MPa , Vacuum degree 8Pa, heat preservation 4min, infrared temperature measurement is used in the sintering process, and finally it is cooled with the furnace.

[0032] Secondary hardening heat treatment of machinable multiphase ce...

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Abstract

The invention relates to the field of ceramic material preparation and discloses a processable complex-phase ceramic material and a preparation method and a secondary hardening heat treatment method thereof. The processable complex-phase ceramic material comprises the following components in percentage by weight: 40-80% of SiC, 5-30% of h-BN and 5-50% of Al; and the machinable complex-phase ceramic material with relatively low hardness can be prepared by proportioning and ball-milling the components into mixed powder and then sintering the mixed powder in a PAS (Plasma Activated Sintering) furnace in one step. The prepared machinable complex-phase ceramic material can be processed into products mechanically; and by carrying out secondary hardening treatment on the products in a heat treatment furnace under the protection of N2, the hardness of the products can be improved and the application scope of the products can be widened.

Description

technical field [0001] The invention relates to the field of ceramic material manufacturing, in particular to a machinable multiphase 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 using 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 strengthening methods and composite methods to improve the mechanical properties of machinable ceramic materials through reasonable component matching, and to reconcile the contradiction between the machinability and strength of ceramic materials. For example, nanotechnology, hexagonal boron nitride (h-BN) sec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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