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Low temperature fast preparation method of AlON crystalline ceramics

A transparent ceramic, fast technology, applied in the field of low-temperature rapid preparation, can solve problems such as restricting the shape of products, and achieve the effects of reducing impurities, good energy saving, and short holding time.

Active Publication Date: 2013-01-16
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Tian Tingyan et al. (Tian Tingyan, Du Hongbing, Jiang Huawei, Sun Feng, Chen Guangle, Zhang Wei, Lu Ke, Peng Zhenzhen. Preparation and properties of AlON transparent ceramics, Journal of Ceramics, 2010, Vol.38, 8:1455-1458) used hot pressing The sintering method prepares AlON transparent ceramics with high transmittance under the pressure of 15-25MPa and 1850-1950°C for 2-5h, but the shape of the product is limited due to the pressure applied during the preparation process.

Method used

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  • Low temperature fast preparation method of AlON crystalline ceramics
  • Low temperature fast preparation method of AlON crystalline ceramics
  • Low temperature fast preparation method of AlON crystalline ceramics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] ①Ball milling: AlON powder and 0.5wt.% Y 2 o 3 Silicon nitride balls of 10mm, 8mm, and 5mm were used as the ball milling medium, the gradation of the balls was 1:0.8:1.2, the ball-to-material ratio was 6:1, and anhydrous ethanol 4 times the powder mass was added as the dispersion medium, and the poly Ball mill at 170r / min for 24h in a tetrafluoroethylene jar. like figure 1 (b) and figure 2 As shown in (b), the obtained powder has a small particle size and has a bimodal and narrow particle size distribution. SEM of the powder before ball milling see figure 1 (a), particle size distribution see figure 2 (a).

[0052] ②Drying and molding: Dry the AlON ceramic powder slurry obtained in step ① on a hot plate at 150°C for 60 minutes, pass through a 50-mesh sieve, and then dry-press on a tablet machine with a pressure of 100MPa to obtain an AlON green body.

[0053] ③Pre-vacuumize the sintering furnace: Put the green body formed in step ② into the graphite crucible,...

Embodiment 2

[0056] Other steps are the same as in Example 1, except that the ball mill speed is 250r / min, and the time is 24h. like figure 1 (c) and figure 2 As shown in (c), the obtained powder has the characteristics of fine particle size and three-peak particle size distribution. The sintering temperature is 1900°C, and the holding time is 60 minutes. The prepared ceramic phase composition is AlON transparent ceramics, see image 3 (b), microstructure see Figure 4 (b).

Embodiment 3

[0058] Other steps are the same as in Example 2, except that the ball milling time is 36h. like figure 1 (d) and figure 2 As shown in (d), the obtained powder particles are fine and have a unimodal particle size distribution characteristic, and the particle size distribution range is narrow. The sintering temperature is 1820 °C and the holding time is 120 min. The prepared ceramic phase composition is AlON transparent ceramics, see image 3 (c), microstructure see Figure 4 (c).

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Abstract

The invention relates to a low temperature fast preparation method of AlON crystalline ceramics, and belongs to the technical field of crystalline ceramic preparation. The preparation method provided by the invention applies ball-milling modification to AlON powder by adopting a planetary ball mill, the modified powder has tiny particles, and has the grain size distribution characteristics of single-modal, double-modal, multi-modal and the like, while possessing the characteristic of narrow molecular distribution, so as to be beneficial to improve the compactness of blank bodies and promote the sintered densification. The AlON powder which is manufactured through ball-milling modification and has the grain size distribution characteristics can be formed through preforming without adding binder, and further isostatic cool pressing is not required. The compactness of the blank bodies is high, and AlON crystalline ceramics with transmittance greater than 80% can be obtained through keeping the heat of the blank bodies at a temperature below 1900 DEG C with the effect of sintering agents. The preparation method has the advantages of low sintering temperature, short heat preservation time and good energy-saving effect; and the requirement for equipment is not high. The preparation method can be used for preparing construction members in abnormal shapes, so that the applied range is wide, the cost is low, the operation is simple and easy, and the industrialization is easy to realize.

Description

technical field [0001] The invention relates to a low-temperature rapid preparation method of AlON transparent ceramics, belonging to the technical field of transparent ceramics preparation. Background technique [0002] Polycrystalline aluminum oxynitride (AlON for short) has good light transmission in a wide band (ultraviolet-visible-infrared), as well as excellent mechanical properties and good chemical stability. Sapphire, but because of its advantages in preparation as a polycrystalline ceramic material, its cost is much lower than that of sapphire, so it is the most competitive infrared window material, and it is currently recognized internationally as the most potential of the three types of infrared windows. It is one of the candidate materials for transparent armor and has broad application prospects in many fields such as national defense and commerce. [0003] The solid-state reaction using alumina and aluminum nitride as raw materials is a method for preparing t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/622
Inventor 单英春徐久军
Owner DALIAN MARITIME UNIVERSITY
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