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Sintering anti-deformation method of ultra-thin transparent ceramic casting biscuit

A transparent ceramic and anti-deformation technology, which is applied in the field of sintering and anti-deformation of ultra-thin transparent ceramic cast china, can solve problems such as deformation of thin ceramic china, and achieve the effects of maintaining deformation, improving uniformity and high efficiency.

Active Publication Date: 2019-08-09
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of deformation of thin ceramic green bodies in the existing sintering process, the present invention designs a sintering anti-deformation method for ultra-thin transparent ceramic casting green bodies, which is characterized in that the ultra-thin transparent ceramic green bodies prepared by tape casting method After debinding, the ultra-thin transparent ceramic green body is fixed between two smooth flat tungsten plates of the anti-deformation device in the form of "sandwich" during the process of vacuum sintering to obtain densification;

Method used

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  • Sintering anti-deformation method of ultra-thin transparent ceramic casting biscuit
  • Sintering anti-deformation method of ultra-thin transparent ceramic casting biscuit

Examples

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Effect test

Embodiment 1

[0019] Example 1: YAG ultra-thin transparent ceramics

[0020] The YAG slurry (n(Y 2 o 3 ) / n(Al 2 o 3 )=3:5) Casting, the area of ​​the green body after debinding is 50mm×300mm, and the thickness is 1mm. Place the ultra-thin transparent ceramic green body 6 after glue removal on the anti-deformation device, and keep 3cm from the edge of the serial screw 2 on the anti-deformation device, and the size of the smooth flat tungsten plate 1 is 1.5 times the size of the ultra-thin transparent ceramic green body 6 , the thickness is 2mm. The anti-deformation device is 60° to the horizontal plane. Vacuum sintering at 1850°C for 24 hours and annealing at 1200°C for 8 hours to obtain smooth and even ultra-thin transparent ceramic flakes.

Embodiment 2

[0021] Embodiment two: Y 2 o 3 Ultra-thin transparent ceramics

[0022] Will Y 2 o 3 Slurry casting, after debinding, the green body has an area of ​​100 mm×200 mm and a thickness of 50 μm. Place the ultra-thin transparent ceramic green body 6 after glue removal on the anti-deformation device, and keep 1cm from the edge of the serial screw 2 on the anti-deformation device, and the size of the smooth flat tungsten plate 1 is 1.2 times the size of the ultra-thin transparent ceramic green body 6 , with a thickness of 1mm. The anti-deformation device is 30° from the horizontal plane. After pre-sintering at 1500°C for 8 hours, hot isostatic pressing at 1700°C for 12 hours, and annealing at 1200°C for 8 hours, a smooth and smooth ultra-thin transparent ceramic sheet is obtained.

Embodiment 3 3

[0023] Example 3 three: AlN ultra-thin transparent ceramics

[0024] The AlN slurry is flow-cast, and the green body after debinding has an area of ​​300mm×200mm and a thickness of 2mm. Place the ultra-thin transparent ceramic green body 6 after glue removal on the anti-deformation device, and keep 5cm from the edge of the serial screw 2 on the anti-deformation device, and the size of the smooth flat tungsten plate 1 is twice the size of the ultra-thin transparent ceramic green body 6 , the thickness is 3mm. The anti-deformation device is 90° to the horizontal plane. Vacuum sintering at 1700°C for 12 hours, annealing at 1400°C for 12 hours, and polishing to obtain smooth and flat transparent ceramic sheets.

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Abstract

The invention discloses a sintering and deformation preventing method for an ultrathin transparent ceramic casting biscuit. The sintering and deformation preventing method is characterized in that after the ultrathin transparent ceramic casting biscuit (6) prepared by adopting a tap-casting formation method is subjected to dump batch, the ultrathin transparent ceramic casting biscuit (6) is fixed between two smooth flat tungsten plates (1) of a deformation preventing device in a process of obtaining densification by vacuum sintering. The deformation preventing device shrinks in real time under the action of a tungsten spring (3) in a sintering and shrinking process of the ceramic biscuit, and the smooth flat tungsten plates (1) are continuously kept tight contact with the ultrathin transparent ceramic casting biscuit (6) so as to control surface distortion due to inconsistency of biscuit shrinkage in a sintering process and guarantee the flatness. The sintering and deformation preventing method can be suitable for large-batch production; the quality uniformity of a product is improved.

Description

technical field [0001] The invention relates to a sintering anti-deformation method for an ultra-thin transparent ceramic casting biscuit, and belongs to the technical field of thin ceramic product production. Background technique [0002] The preparation of transparent ceramics includes two major process steps of ceramic biscuit molding and sintering. The molding process of ceramic green bodies has a great influence on the transparency of ceramic products, the molding pressure is high, and the high density of green bodies is conducive to sintering and compactness. Of course, the equipment requirements are high. At present, the more commonly used molding processes include: dry pressing, grouting molding, isostatic pressing molding and tape casting, etc. Dry pressing molding has the advantages of simple process, convenient operation and short cycle, but low benefit, large mold wear and complicated processing , high cost, uneven pressure distribution during pressurization lea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/505C04B35/581
CPCC04B35/10C04B35/505C04B35/581C04B2235/6581C04B2235/662
Inventor 张乐李正吴佳东陈浩高光珍王聘黄国灿
Owner XUZHOU NORMAL UNIVERSITY