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Manufacturing method for zirconium dioxide ceramic green-pressing

A technology of zirconia and nano zirconia, applied in the direction of ceramic molding machines, manufacturing tools, etc., can solve the problem of affecting the strength and light transmittance of nano zirconia ceramics, the inability to eliminate the uneven dispersion of powder agglomeration additives, and poor performance Difficult to meet the requirements and other problems, to achieve the effect of powder utilization rate and labor efficiency improvement, less defects, and dense ceramic body

Inactive Publication Date: 2016-08-17
LIAONING UPCERA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the above molding method is used for molding processing, problems such as powder agglomeration and uneven dispersion of additives cannot be eliminated, resulting in low density of the green body after molding and defects such as holes
These defects will directly affect the strength and light transmittance of the sintered nano-zirconia ceramics
In some specific application fields, such as in the field of dental restoration, when nano-zirconia ceramics are used to make dentures, there are high requirements for the strength and light transmittance of nano-zirconia ceramics. Production of nano-zirconia ceramic green body, after sintering, its performance is difficult to meet the requirements

Method used

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  • Manufacturing method for zirconium dioxide ceramic green-pressing
  • Manufacturing method for zirconium dioxide ceramic green-pressing
  • Manufacturing method for zirconium dioxide ceramic green-pressing

Examples

Experimental program
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Embodiment 1

[0026] (1) Dry pressing preforming: After putting 3mol yttrium stabilized nano-zirconia granulated powder (Oriental Zirconium Industry, OZ-3Y type) into the dry pressing mold, carry out dry pressing molding to obtain the preform, wherein, dry pressing The molding temperature is 25°C and the pressure is 30MPa;

[0027] (2) Warm isostatic pressing: after the preform after dry pressing is loaded into a warm isostatic pressing mold, it is subjected to warm isostatic pressing to obtain a zirconia ceramic green body, wherein the temperature of warm isostatic pressing is It is 150°C and the pressure is 180Mpa.

Embodiment 2～8

[0029] According to the method as described in Example 1, using the same raw materials as in Example 1, adopting the process parameters of each step of Examples 2 to 8 in Table 1, the nano-sized zirconia ceramic raw materials of Examples 2 to 8 were respectively prepared. Blank. It should be noted that although each embodiment of the present invention uses 3mol yttrium-stabilized nano-zirconia granulated powder to prepare zirconia ceramic green body, other types of nano-zirconia granulated powder commonly used in the ceramic field can be To realize the technical solution of the present invention, the present invention will not be described in detail here.

[0030] The processing parameter of each step of table 1 embodiment 2~8

[0031]

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Abstract

An embodiment of the invention discloses a manufacturing method for zirconium dioxide ceramic green-pressings. The method comprises the following steps: (1) dry pressing performing: after nanometer zirconium dioxide pelleting powders are put into a dry pressing mold, performing dry pressing performing to obtain a preformed blank, wherein pressure in dry pressing performing is 2-100 MPa; (2) temperature isostatic compaction: after the preformed blank which is preformed by dry pressing is put into a temperature isostatic pressing mold, performing temperature isostatic compaction, to obtain a zirconium dioxide ceramic green-pressing. The method manufactures the zirconium dioxide ceramic green-pressing by firstly performing dry pressing performing and then performing temperature isostatic compaction. Since under the action of pressure and temperature of the temperature isostatic pressing, the preformed blank still has good fluidity, nanometer zirconium dioxide powder particles can be stacked in a compact method, and gas and molten additives among the powders are fully discharged. The method makes a ceramic body more compact and defects less, so that the intensity, density, and light transmittance of sintered nanometer zirconium dioxide ceramic are improved.

Description

technical field [0001] The invention relates to the field of preparation of ceramic materials, in particular to a preparation method of a zirconia ceramic green body. Background technique [0002] Nano-zirconium dioxide ceramics have the advantages of high toughness, high bending strength and high wear resistance, excellent thermal insulation performance, and close to negative thermal expansion coefficient, so they are widely used in the field of structural ceramics. [0003] The raw material for preparing nano-zirconia ceramics is nano-zirconia. Due to the characteristics of nano-materials, it is very difficult to directly use nano-zirconia powder for molding and processing. Therefore, in practical applications, the nano-zirconia powder is generally added to the additive for granulation treatment to form a nano-zirconia granulated powder with a particle size of 0.05-0.1 mm, and then the nano-zirconia granulated powder is used for granulation. Molding processing. The granu...

Claims

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Application Information

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IPC IPC(8): B28B3/00C04B35/48
Inventor 严庆云张君锋严庆久
Owner LIAONING UPCERA CO LTD
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