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Machinable aluminium oxide ceramics and preparation method of machinable aluminium oxide ceramics

A technology of alumina ceramics and aluminum hydroxide, applied in the field of machinable alumina ceramics and its preparation, can solve the problems of poor practicability, complexity of preparation process, increase of material cost, etc., to accelerate densification, avoid macroscopic fracture, reduce Effect of sintering temperature

Active Publication Date: 2013-01-16
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, there are undoubtedly some factors that are difficult to accurately control in the experimental process, such as: granulation process, sintering temperature, sintering speed and time, chemical activity of grain boundaries, etc. put forward higher requirements, which will inevitably lead to the increase of material cost and preparation The complexity of the process and poor practicability

Method used

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  • Machinable aluminium oxide ceramics and preparation method of machinable aluminium oxide ceramics
  • Machinable aluminium oxide ceramics and preparation method of machinable aluminium oxide ceramics
  • Machinable aluminium oxide ceramics and preparation method of machinable aluminium oxide ceramics

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Comparison scheme
Effect test

Embodiment 1

[0039] Weigh a certain amount of aluminum nitrate powder to make an aluminum nitrate aqueous solution with a concentration of 0.5mol / L; dilute the concentrated ammonia water with water 10 times to make dilute ammonia water, drop the dilute ammonia water and aluminum nitrate solution into distilled water at the same time, the distilled water The pH value of the control solution is 9, and the sol is obtained by high-speed stirring at room temperature; the obtained sol is placed in a water bath at 85°C for 24 hours, washed with deionized water and ethanol several times, and then dried in a vacuum oven at 90°C. Obtain aluminum hydroxide dry glue; put the aluminum hydroxide dry glue into an alumina crucible, and calcinate at 1200°C for 2 hours to obtain nano-alumina (α-Al 2 o 3 )pink. Weigh α-Al 2 o 3 (particle size 80nm~100nm) 50g, analytical reagent aluminum hydroxide (purity ≥ 99.5%) 23g, potassium chloride (purity ≥ 99.5%) 34g, sodium chloride (purity ≥ 99.5%) 34g, MgO (puri...

Embodiment 2

[0041] A kind of machinable alumina ceramics, the composition of mass percentage includes: 68% of nano-alumina, 30% of flake alumina, 1% of magnesium oxide (MgO) and titanium dioxide (TiO 2 )1%.

Embodiment 3—9

[0043] A kind of machinable alumina ceramics, its mass percentage composition is shown in the following table:

[0044]

[0045] In embodiment 2-9, the particle size of the nano-alumina powder is 80-100nm;

[0046] In Example 2-9, the particle size of the flaky alumina is 3-5 μm, and the thickness is 0.2-0.4 μm.

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Abstract

The invention discloses machinable aluminium oxide ceramics which is characterized in that the machinable aluminium oxide ceramics comprises the following components in percentage by mass: 60 percent to 68 percent of nano alumina, 30 percent to 36 percent of tabular alumina, 0.5 percent to 1.5 percent of magnesium oxide and 1 percent to 3 percent of titanium dioxide. A preparation method of the ceramics comprises the following steps of: preparing the nano alumina; after carrying out mixing and ball milling on the nano alumina, alumina, the magnesium oxide, titanium dioxide and absolute ethyl alcohol, drying the mixture, removing zirconium oxide grinding balls, and carrying out roasting, washing, filtering and drying on the obtained product to obtain composite powder; and after uniformly mixing the composite powder and a polyvinyl alcohol 1799 binder and pelleting the obtained mixture, carrying out dry-pressing forming to obtain a green body and placing the formed green body into a high temperature furnace to carry out sintering so as to obtain the ceramics. The bending strength of the ceramics reaches 526MPa. The fracture toughness of the ceramics reaches 6.4MPa.m1 / 2. The ceramicshave excellent machinable performance. The problems of complex structure and high cost and difficultly-controlled preparation process of the existing machinable ceramics are effectively solved.

Description

technical field [0001] The invention belongs to alumina-based ceramics and a preparation method thereof, and relates to a machinable alumina ceramic and a preparation method thereof. The prepared alumina ceramics have excellent machinability. Background technique [0002] Machinable ceramics: refer to ceramic materials that can be processed at room temperature using traditional machining methods (such as cemented carbide or high-speed steel tools) and meet certain processing surface quality requirements. Generally, the surface roughness after processing is required to be less than 10 μm. Alumina ceramics have high hardness, wear resistance, high temperature resistance, good chemical stability and electrical insulation, low price and wide source of raw materials, so they are the most widely used ceramic materials. [0003] However, since the bonding bonds of ceramic materials are mainly ionic bonds and covalent bonds, the dislocation barrier is very high, and the toughness ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/622
Inventor 廖其龙于佳伟
Owner SOUTHWEAT UNIV OF SCI & TECH
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