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Alumina-based composite ceramic knife material and microwave preparation method thereof

A tool material and composite ceramic technology, which is applied in the field of alumina-based composite ceramic tool material and its microwave preparation, can solve the problems of low density, long heat preservation time, high cost, etc., and achieve the purpose of inhibiting the growth of material grains and improving the structure The effect of density and grain refinement

Inactive Publication Date: 2017-01-25
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the alumina fiber cotton is in direct contact with the crucible, the temperature of the crucible will be lost too quickly
And there is only one preparation cavity in this patent, the preparation efficiency of tool material is low
[0005] It can be seen from the above that the efficiency of the existing hot pressing sintering technology is low, and the corresponding Al 2 o 3 The cost of / TiC ceramic tools is higher; pressureless sintered Al 2 o 3 / TiC ceramics require high sintering temperature and long holding time, and the sintered tool material is not high in density and performance; while the sintering efficiency of existing microwave sintering and heat preservation devices is low
Therefore, it is difficult for existing technologies to successfully realize high-performance Al 2 o 3 Low-cost, mass production of TiC composite ceramic cutting tools

Method used

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  • Alumina-based composite ceramic knife material and microwave preparation method thereof

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Effect test

Embodiment 1

[0031] By mass percentage Al 2 O 3 61.4%, TiC is 30%, Mo, Ni, MgO, Y 2 O 3 , Cr 3 C 2 The ingredients are respectively 3%, 3%, 0.65%, 0.65%, and 1.3%. The Al 2 O 3 The particle size of the powder particles is 0.6μm, the particle size of TiC powder is 1μm, using alcohol as the ball milling medium, ball milling in a QM~3SP2 planetary ball mill at 200rpm for 48h, and then adding a 5wt% PVA solution to the raw materials , Continue ball milling for 2 hours; take out the mixture and place it in a drying oven for drying, then sieving. The obtained mixture is put into a mold, and a green body with a certain shape and strength is obtained by a cold pressing method through a pressure of 200 MPa, and the pressure is maintained for 3 minutes. Place the pressed blanks in a special multi-cavity microwave heat preservation device, put them into the NJZ5~1 vacuum microwave sintering furnace, heat up to 1700°C at a heating rate of 40-50°C / min and keep the temperature for 10 minutes, and complete...

Embodiment 2

[0034] By mass percentage: Group I Al 2 O 3 Is 71.4%, TiC is 20%, group II Al 2 O 3 Is 61.4%, TiC of group III is 30%, Al 2 O 3 51.4%, 40% TiC, additives Mo, Ni, MgO, Y 2 O 3 , Cr 3 C 2 The content remains the same, and they are 3%, 3%, 0.65%, 0.65%, and 1.3% ingredients respectively. The Al 2 O 3 The particle size of the powder particles is 0.6μm, the particle size of TiC powder is 1μm, using alcohol as the ball milling medium, ball milling in a QM~3SP2 planetary ball mill at 200rpm for 48h, and then adding a 5wt% PVA solution to the raw materials , Continue ball milling for 2 hours; take out the mixture and place it in a drying oven for drying, then sieving. The obtained mixture is put into a mold, and a green body with a certain shape and strength is obtained by a cold pressing method through a pressure of 200 MPa, and the pressure is maintained for 3 minutes. Put the three types of pressed blanks into a special multi-cavity microwave heat preservation device, put them into t...

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Abstract

The invention belongs to the field of microwave sintering material science and relates to an Al2O3 / TiC composite ceramic knife material and microwave preparation method thereof. The microwave preparation method is characterized by including: determining content according to mass percent, wherein Al2O3 which is a matrix phase is 61.4-81.4%, TiC which is a reinforcement phase is 10-30%, Mo and Ni which are additives are 4-6%, MgO and Y2O3 are 1-1.5%, and Cr3C2 is 1-2.5%. The microwave preparation method includes: blending according to the above formula, utilizing a QM-3SP2 planetary ball mill for material mixing to prepare mixed powder, and pressing to form a biscuit; utilizing a microwave sintering temperature-holding device to successfully prepare the Al2O3 / TiC composite ceramic knife material through high-purity argon protection and microwave sintering process. The composite material is high in compactness, and the microwave preparation method is suitable for manufacturing knives made of materials difficult to process and high in preparation efficiency. The material prepared by the method is good in performance and low in energy source consumption.

Description

Technical field [0001] The invention belongs to the technical field of machining tool manufacturing equipment, in particular to an alumina-based composite ceramic tool material and a microwave preparation method thereof. Background technique [0002] Al 2 O 3 / TiC composite material has excellent properties such as high electrical conductivity, high hardness, high strength and high fracture toughness, so it has a wide range of uses, especially as ceramic tools. The Al used as a tool reported so far 2 O 3 / TiC composite ceramics are mostly obtained by hot-pressing sintering. At the same time, hot-pressing sintering can help mass transfer processes such as contact, diffusion and flow between particles, which can reduce the sintering temperature and shorten the sintering time, and inhibit the grain Growth without burning aids. It is easy to obtain a sintered body close to the theoretical density, and the obtained material has high performance. However, the hot pressing sintering e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/78C04B35/10C04B35/622C04B35/64
CPCC04B35/78C04B35/10C04B35/622C04B35/64C04B2235/3206C04B2235/3225C04B2235/3839C04B2235/3843C04B2235/404C04B2235/405C04B2235/667
Inventor 王坤程志侯可程寓
Owner NANJING UNIV OF SCI & TECH
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