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A cold isostatic pressing method suitable for optical ceramics and a preparation method of optical ceramics

A technology of optical ceramics and cold isostatic pressing, which is applied in the field of optical ceramics, can solve problems such as many defects, uneven force, and reduced ceramic transmittance, and achieve the effects of reducing edge defects, avoiding damage, and high transmittance

Active Publication Date: 2019-01-01
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the vacuum bag does not have good flexibility, it is easy to damage the edges and corners of the cylindrical green body during cold isostatic pressing or vacuuming, resulting in a decrease in the transmittance of the periphery of the ceramic sheet due to the existence of these defects.
In addition, in the usual cold isostatic pressing method, since the vacuum bag has a certain hardness, there are still gaps between the vacuum bag and the blank when vacuuming, so that the force is likely to be uneven during cold isostatic pressing, resulting in local ceramic parts. The density is relatively low, there are more defects, and the transmittance of ceramics is reduced

Method used

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  • A cold isostatic pressing method suitable for optical ceramics and a preparation method of optical ceramics
  • A cold isostatic pressing method suitable for optical ceramics and a preparation method of optical ceramics
  • A cold isostatic pressing method suitable for optical ceramics and a preparation method of optical ceramics

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preparation example Construction

[0049] The present invention also provides a preparation method of optical ceramics, comprising the following steps:

[0050] a) stacking several optical ceramic cylindrical blanks after dry pressing to form a cylinder, and separating each two cylindrical blanks with circular weighing paper;

[0051] b) wrapping the stacked cylinder in step a) with plastic wrap for at least 2 layers;

[0052] c) putting the wrapped cylinder in step b) into a vacuum bag to evacuate, then cold isostatic pressing, and obtaining the optical ceramic blank after cold isostatic pressing through decompression;

[0053] d) Calcining, vacuum sintering, annealing and polishing the optical ceramic blank after the cold isostatic pressing in step c) in sequence to obtain the optical ceramic.

[0054] The specific content of the preparation steps for obtaining the optical ceramic green body after cold isostatic pressing in the present invention is as described above, and will not be repeated here.

[0055]...

Embodiment 1

[0061] The present invention prepares the method steps of Nd-doped yttrium aluminum garnet ceramics as follows:

[0062] (1) According to the molar ratio Y:Al=3:5, Nd:Y=1:99, accurately weigh the corresponding amount of Y 2 o 3 、Al 2 o 3 、Nd 2 o 3 Put it into a ball mill jar, add a certain amount of teos as an additive, and alcohol as a ball milling agent. A corresponding amount of high-purity alumina balls was added as ball milling balls, put into a ball mill at a rotational speed of 240 rpm, and ball milled for 960 min. Among them, teos is weighed according to 0.5% of the total powder mass, and alumina balls are added according to the powder: alcohol: ball volume ratio of 1:4:4.

[0063] (2) Put the ball-milled jar into a drying oven and dry at 80° C. for 24 hours, then use a 200-mesh sieve to separate the balls from the powder and sieve the powder.

[0064] (3) Put the sieved powder into a muffle furnace for calcination at 800°C for 3h.

[0065] (4) The calcined pow...

Embodiment 2

[0084] The present invention prepares the method steps of bait-doped yttrium aluminum garnet ceramics as follows:

[0085] (1) Accurately weigh the corresponding amount of Y according to the molar ratio Y:Al=3:5, Er:Y=1:99 2 o 3 、Al 2 o 3 、Er 2 o 3 Put it into a ball mill jar, add a certain amount of teos as an additive, and alcohol as a ball milling agent. A corresponding amount of high-purity alumina balls was added as ball milling balls, put into a ball mill at a rotational speed of 240 rpm, and ball milled for 960 min. Among them, teos is weighed according to 0.5% of the total powder mass, and alumina balls are added according to the powder: alcohol: ball volume ratio of 1:4:4.

[0086] (2) Put the ball-milled jar into a drying oven and dry at 80° C. for 24 hours, then use a 200-mesh sieve to separate the balls from the powder and sieve the powder.

[0087] (3) Put the sieved powder into a muffle furnace for calcination at 800°C for 3h.

[0088] (4) Keep the calcined...

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Abstract

The invention provides a cold isostatic pressing method for optical ceramics and a manufacturing method of the optical ceramics. The cold isostatic pressing method for the optical ceramics comprises the following steps that (a) a plurality of optical ceramic cylindrical biscuits which are formed through dry pressing are stacked into a cylinder, and every two cylindrical biscuits are partitioned by a piece of round weighing paper; (b) preservative film is wrapped around the cylinder formed through stacking in the step (a) for at least two layers; (c) the cylinder wrapped inside the preservative film in the step (b) is placed in a vacuum bag, vacuumizing is conducted, cold isostatic pressing is conducted, and after pressure relief, the optical ceramic biscuits formed through cold isostatic pressing are obtained. By the adoption of the cold isostatic pressing method for the optical ceramics, the ceramic biscuits with edges being scarcely damaged can be manufactured, and then high-transmittance ceramic sheets can be manufactured. Experiments prove that the edge defects of the Nd:YAG laser ceramics sintered by the adoption of the novel cold isostatic pressing method are greatly reduced, and the transmittance can reach 81% after polishing.

Description

technical field [0001] The invention relates to the technical field of optical ceramics, in particular to a cold isostatic pressing method suitable for optical ceramics and a preparation method of optical ceramics. Background technique [0002] Optical ceramics, also known as transparent ceramics, can have excellent properties such as high temperature resistance, corrosion resistance, erosion resistance, and high strength due to differences in raw material types, manufacturing methods, and product varieties. They are widely used in laser technology, space technology, electricity, optics, and chemical industry. , metallurgy and other aspects are widely used. At present, commonly used optical ceramics include alumina, magnesia, yttrium trioxide (Y 2 o 3 ), calcium fluoride, beryllium oxide, gadolinium trioxide (Gd 2 o 3 ), calcium oxide, thorium oxide (ThO 2 ) and lead lanthanum zirconate titanate ceramics (PLZT), etc. [0003] Among them, Nd: YAG laser ceramics, as a la...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28B3/00C04B35/44C04B35/505C04B35/622
CPCB28B3/003C04B35/44C04B35/505C04B35/622C04B2235/3224
Inventor 林少腾吴起白张海燕谢忠祥张丽庆
Owner GUANGDONG UNIV OF TECH
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