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High-performance AlON transparent ceramic and low-temperature rapid preparation method thereof

A transparent ceramic, high-performance technology, applied in the field of high-performance AlON transparent ceramics and its low-temperature rapid preparation, which can solve the problem of the decrease in the transmittance and mechanical properties of AlON transparent ceramics, the decrease in the transmittance of AlON transparent ceramics, and the difficulty of sample densification, etc. The problem is to shorten the sintering time, improve the comprehensive mechanical properties, and inhibit the grain growth.

Active Publication Date: 2022-05-27
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the amount of sintering aid is too small, the sintering temperature will be higher, the densification of the sample will be difficult, and the pores will be difficult to discharge, resulting in a decrease in the transmittance and mechanical properties of AlON transparent ceramics; if the amount of sintering aid is too large, the excess sintering aid will be The second phase grows inside the crystal, causing light scattering, which also leads to a decrease in the transmittance of AlON transparent ceramics

Method used

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  • High-performance AlON transparent ceramic and low-temperature rapid preparation method thereof
  • High-performance AlON transparent ceramic and low-temperature rapid preparation method thereof
  • High-performance AlON transparent ceramic and low-temperature rapid preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Step 1) Powder mixing

[0037] The molar ratio is 60 mol%: 40 mol% of the γ-Al 2 O 3 Powder (purity 99.99%, particle size 50 nm) and AlN powder (purity 99.99%, particle size 50 nm), sintering auxiliary (0.08 wt% Y 2 O 3 +0.2wt％MgO+0.08wt％La 2 O 3 ), in 3mm, 8mm, 10mm high purity Al 2 O 3 The ball is a ball mill medium, the ball material ratio is 3:1, and absolute ethanol is added as the dispersion medium, which is put into the nylon tank together, and the ball mill is milled at a speed of 100r / min for 30h using a full-range planetary ball mill.

[0038] Step 2) Powder drying

[0039]The powder is dried by a rotary evaporator, and the dried powder is ground and passed through a 200 mesh sieve to obtain a uniformly dispersed mixed powder.

[0040] Step 3) Mold Loading: Load the dried mixed powder into the graphite mold. For better demolding, 1 to 2 layers of graphite paper need to be cushioned between the powder and the graphite mold; in order to prevent heat loss during the ...

Embodiment 2

[0050] Step 1) Powder Mixing:

[0051] The molar ratio is 64.3 mol%: 35.7 mol% of γ-Al 2 O 3Powder (purity 99.99%, particle size 20 nm) and AlN powder (purity 99.99%, particle size 50 nm), sintering aid (0.12 wt%Y 2 O 3 +0.3wt％MgO+0.04wt％La 2 O 3 ) to 3mm, 8mm, 10mm high purity Al 2 O 3 The ball is a ball mill medium, the ball material ratio is 4:1, and anhydrous ethanol is added as the dispersion medium, which is put into the nylon tank together, and the ball mill is milled at a speed of 150r / min for 20h using a full-range planetary ball mill.

[0052] Step 2) Same as Example 1

[0053] Step 3) Same as Example 1.

[0054] Step 4) Discharge plasma sintering:

[0055] Put the installed mold into the furnace chamber of the discharge plasma sintering furnace, start sintering after the vacuum degree is less than 20Pa, rise to 1580 °C at a heating rate of 150 °C / min, and cool with the furnace after 10 min of insulation, and the pressure during the sintering process is 50MPa.

[0056] S...

Embodiment 3

[0064] Step 1) Powder Mixing:

[0065] The molar ratio is 64.3 mol%: 35.7 mol% of γ-Al 2 O 3 Powder (purity 99.99%, particle size 20 nm) and AlN powder (purity 99.99%, particle size 50 nm), sintering auxiliary (0.16 wt%Y 2 O 3 +0.4wt％MgO+0.08wt％La 2 O 3 ) to 3mm, 8mm, 10mm high purity Al 2 O 3 The ball is a ball mill medium, the ball-to-material ratio is 5:1, and absolute ethanol is added as the dispersion medium, which is put into the nylon tank together, and the ball mill is ground at a speed of 200r / min for 10h using an all-round planetary ball mill.

[0066] Step 2) Same as Example 1

[0067] Step 3) Same as Example 1.

[0068] Step 4) Discharge plasma sintering:

[0069] The installed mold is put into the discharge plasma sintering furnace chamber, vacuum to vacuum less than 20Pa after the start of sintering, at a temperature rate of 200 °C / min to 1600 °C, heat preservation for 5 min with the furnace cooling, sintering process pressure of 60MPa.

[0070] Step 5) Decarboniza...

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Abstract

The invention relates to a high-performance AlON transparent ceramic and a low-temperature rapid preparation method thereof. The preparation method comprises the following steps: carrying out ball milling and mixing on gamma-Al2O3, AlN and three-phase sintering aids (Y2O3, MgO and La2O3); filling the dried powder into a graphite mold; the graphite mold is placed in a discharge plasma sintering furnace for vacuum sintering, and finally a sample is subjected to carbon removal treatment in the N2 atmosphere. According to the method, the novel Y2O3, MgO and La2O3 three-phase sintering aids are adopted, and the discharge plasma sintering technology is utilized to prepare the AlON transparent ceramic through solid-phase reaction in one step, so that the preparation process of the AlON transparent ceramic is simplified, the sintering temperature of the AlON transparent ceramic is greatly reduced, the sintering time is shortened, meanwhile, the density of the AlON transparent ceramic is improved, and the AlON transparent ceramic has good application prospects. The comprehensive mechanical property of the AlON transparent ceramic is greatly improved on the premise of ensuring the transmittance of the AlON ceramic.

Description

Technical field [0001] The present invention relates to a high-performance AlON transparent ceramic and a low-temperature rapid preparation method thereof, belonging to the field of transparent ceramic material preparation. Background [0002] Spinel-type aluminum nitric oxide (γ-AlON) is Al 2 O 3 An important class of single-phase, stable solid-solution ceramics in the AlN system, with an optical isotropic cubic structure. AlON transparent ceramics have excellent optical transparency, high strength, high hardness, excellent wear and scratch resistance, chemical corrosion resistance and other characteristics, is the ideal material for the preparation of transparent armor. [0003] At present, AlON transparent ceramic sintering mainly uses non-pressure sintering, which requires the synthesis of AlON powder at high temperature, and then preforming the powder, and finally high temperature sintering to make it dense. The sintering method has the disadvantages of high cost, complex pr...

Claims

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Application Information

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IPC IPC(8): C04B35/582C04B35/622C04B35/626C04B35/64C04B35/645
CPCC04B35/581C04B35/622C04B35/6261C04B35/64C04B35/645C04B2235/3217C04B2235/3206C04B2235/3227C04B2235/3225C04B2235/5454C04B2235/5445C04B2235/5436C04B2235/661C04B2235/666C04B2235/6562C04B2235/6567C04B2235/96C04B2235/9653
Inventor 张朝晖贾晓彤程兴旺徐天豪刘罗锦李先雨贾兆虎刘娅冯向向王强
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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