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Ceramic and preparation method and application thereof

A ceramic and oxide technology, applied in the field of structural ceramics, can solve the problems of difficult practical application of zirconia, easy to float above the material, reduce work efficiency, etc., and achieve the effects of rich colors, good thermal shock resistance, and reduced wear and tear

Inactive Publication Date: 2012-08-08
QIANDONG RARE EARTH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The theoretical upper limit of the density of yttria-stabilized zirconia products is 6.10g / cm 3 , the density range of the actually produced yttrium-zirconium ceramic products is 5.9~6.07g / cm 3 , the grinding medium of this material is easy to float above the material in the application of dealing with viscous or dense materials, reducing work efficiency
Although cubic phase zirconia theoretically has 6.27g / cm 3 Density, but in the preparation process, as the temperature decreases, its crystal form transforms into a larger tetragonal phase, and the density decreases, so 6.27g / cm 3 Zirconia is difficult for practical application

Method used

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  • Ceramic and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Ceramic granulating powder and ceramic knives are prepared from oxide powder materials as raw materials.

[0045] Step 1: Add each oxide and 800g of deionized water into a ball mill according to the ratio of Example 1 in Table 1, and mix uniformly to obtain slurry one;

[0046] Step 2: Add 167g of PVA and 11g of carboxymethylcellulose to slurry one and continue ball milling to obtain slurry two;

[0047] Step 3: Granulate the second slurry to obtain ceramic granulated powder;

[0048] Step 4: Dry the ceramic granulated powder prepared in Step 3 into a hydraulic press, and then perform isostatic pressing together with the molded body obtained in the comparative example to obtain a ceramic knife green body;

[0049] Step 5: Debinding the ceramic knife green body and the green body obtained in the comparative example in the same furnace and sintering at 1305°C to form a ceramic knife blank;

[0050] Step 6: Then the ceramic knife blank is ground, shaped, sharpened, and polished to ob...

Embodiment 2

[0052] Preparation of ceramic powder and ceramic knife with yttrium zirconium ceramic powder and other oxides as raw materials:

[0053] Step 1: Add 617g of yttrium-zirconium ceramic granulated powder (Y2O35.5wt% and ZrO294.5wt% in terms of oxides), 81g of yttrium oxide and other oxides in Example 2 of Table 1 and 900g of deionized water into a ball mill to obtain a ball mill. Slurry one; the yttrium-zirconium ceramic granulated powder is a mixture of yttrium oxide and zirconium oxide obtained by firing yttrium zirconium hydroxide and then pulverized and spray-granulated powder;

[0054] Step 2: Add 125g of PVA, 10.5g of CMC and 15g of polyacrylic acid to slurry one and continue ball milling to obtain slurry two;

[0055] Step 3: Input the second slurry into a spray granulator for spray granulation to obtain ceramic granulated powder;

[0056] Step 4: Dry the ceramic granulated powder produced in Step 3 on a hydraulic press to form a green ceramic knife, and then subject it to isostat...

Embodiment 3

[0060] Preparation of ceramic powder and ceramic grinding pot with yttrium zirconium ceramic precursor and other oxides as raw materials:

[0061] Step 1: Add the yttrium zirconium ceramic precursor (containing Y 2 O 3 10g, ZrO 2 659g), other oxides, and deionized water are added to the ball mill and ball milled into slurry 1. The weight of deionized water is 950g; the yttrium-zirconium ceramic precursor is yttrium element and zirconium element obtained by co-precipitation of yttrium hydroxide and zirconium hydroxide mixture;

[0062] Step 2: After drying slurry 1, add 121g of PVA and 150g polymaleic acid to continue ball milling to obtain slurry 2;

[0063] Step 3: Input the second slurry into a spray granulator for spray granulation to obtain ceramic granulated powder;

[0064] Step 4: Dry pressing the ceramic granulated powder obtained in Step 3 to obtain a green ceramic grinding pot;

[0065] Step 5: After debinding, the green ceramic grinding pot is sintered into a ceramic grind...

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Abstract

The invention discloses ceramic and a preparation method and application thereof and relates to zirconia ceramic. By adding cerium oxide and yttrium oxide into zirconia, the zirconia ceramic with performance not inferior to the performance of yttrium zirconium structural ceramic is prepared at lower temperature. The ceramic comprises the following oxides in percent by weight: 7-30 percent of CeO2, 0.1-12 percent of Y2O3 and 50-92 percent of ZrO2. The density can reach 6.4g / cm<3>. The colors of zirconia products are enriched. The ceramic product can work in environments with the temperature being 250 DEG C, the grinding efficiency of the ceramic grinding medium during dry-process grinding and viscous material grinding is improved, the grinding loss is smaller, a new product is added to zirconia structural ceramic and the application scope of the zirconia structural ceramic is widened.

Description

Technical field [0001] The invention relates to a zirconia ceramic, which belongs to the technical field of structural ceramics. Background technique [0002] Zirconia has three crystal types: monoclinic system, tetragonal system and cubic system. Usually monoclinic crystal system with a density of 5.65g / cm 3 ; Transformed into tetragonal crystal system at 1170℃ with a density of 6.10g / cm 3 ; Converted to cubic crystal system at 2715℃, density is 6.27g / cm 3 . When sintering zirconia ceramics, the conversion between crystal forms is accompanied by volume expansion and contraction. This expansion and contraction do not occur at the same temperature. Therefore, the use of pure zirconia sintering will cause the product to crack, and it is difficult to produce pure zirconia. In the actual production of ceramics, certain oxides are added as crystal stabilizers, such as Y 2 O 3 , CaO, MgO, etc., stabilize the crystal form of zirconia into a tetragonal crystal form, and reduce the shrin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/622
Inventor 龚斌刘革命李联和胡志军杨惠明王文平谢楠彭牛生
Owner QIANDONG RARE EARTH GRP
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