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Blue rare earth zirconium ceramic powder as well as manufacture and application thereof

A technology of ceramic powder and rare earth, applied in the field of ceramic materials, can solve the problems of low anti-aging performance, reduced material toughness, strength and hardness, flexural strength, fracture toughness, etc., to enrich the market and improve the quality of life.

Active Publication Date: 2012-07-11
QIANDONG RARE EARTH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the rare earth zirconium structure ceramic material itself is white and has a single color tone, it cannot meet the requirements of various high-end products in various civilian fields, so colored rare earth zirconium structure ceramics have become the focus of research and development for its wide application in the civilian field.
[0003] Publication No. 101475374 of the Chinese patent "A preparation method of powder blue zirconia ceramics and the prepared product" discloses a powder blue zirconia ceramic, which uses cobalt oxide, Silicon, alumina, vanadium pentoxide, magnesium oxide, through ball milling, drying, sieving, mixing, injection, solvent degreasing, thermal degreasing, firing, rough processing, finishing, polishing to prepare powdery blue zirconia ceramics and products, but due to the addition of more silicon dioxide, vanadium pentoxide and magnesium oxide, these oxides generate a liquid phase at a relatively low temperature during the sintering stage of zirconia, and aggregate to form a molten pool, cooling When the crystal size of the precipitated oxide grows abnormally, or it is preserved in the glass phase at the grain boundary of zirconia, these abnormally grown crystals and glass phase seriously reduce the toughness, strength and hardness of the material; and part of the added cobalt oxide cannot Enter the zirconia crystal lattice, precipitate or form a glass phase at the grain boundary, on the one hand, reduce the physical properties of zirconia ceramics, on the other hand, there are safety hazards that heavy metal elements are easy to dissolve when used; the aforementioned powder blue zirconia and the current No gadolinium element is added to commercially available zirconia products. As time increases, the flexural strength and fracture toughness of zirconia products decrease to varying degrees, and their anti-aging performance is low.

Method used

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  • Blue rare earth zirconium ceramic powder as well as manufacture and application thereof
  • Blue rare earth zirconium ceramic powder as well as manufacture and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1~9

[0035] Embodiment 1~9 batching according to the table:

[0036] Table 1 Example ingredient list (unit: kg)

[0037] Example

[0038] La 2 o 3

Embodiment 1

[0040] CoAl 2 o 4 and rare earth oxides as raw materials to prepare blue rare earth zirconium structure ceramic powder and blue rare earth zirconium ceramic knife blank.

[0041] Step 1: CoAl is mixed according to the proportioning of embodiment 1 in table 1 2 o 4 And each rare earth oxide and 80kg of deionized water are added into a ball mill and ball milled to become D 50 = 0.48 μm slurry one [slurry particle size data is measured by "Easizer 30" wet method, the following examples are the same].

[0042] Step 2: Add 16.7kg of PVA and 1.1kg of CMC to slurry 1 and continue ball milling to obtain slurry 2;

[0043] Step 3: Input the slurry 2 into the spray granulator for spray granulation to obtain particle size D 25 =8.7μm, D 50 = 10.3 μm, D 75 =20.6μm, (D 75 -D 25 ) / (D 75 +D 25 )=0.41 blue rare earth zirconium granulated powder (the particle size data of the powdery material is measured by a German Sympate automatic laser particle size analyzer, and the following e...

Embodiment 2

[0046] CoAl 2 o 4 Prepare blue rare earth zirconium ceramic powder and blue rare earth zirconium ceramic knife blank with yttrium zirconium ceramic powder and other oxides as raw materials:

[0047] Step 1: 89.7kg of yttrium-zirconium ceramic granulated powder (calculated as Y in terms of oxides) 2 o 3 3.46wt%, ZrO 2 96.54wt%), CoAl in Table 1 Example 2 2 o 4 and divide Y 2 o 3 , ZrO 2 Add other oxides and deionized water 90kg into ball mill and ball mill to become D 50 = 0.53 μm slurry one; the yttrium-zirconium ceramic granulated powder is a mixture of yttrium oxide and zirconium oxide obtained by burning yttrium-zirconium hydroxide and then pulverized and spray-granulated powder (without granulation It is called yttrium zirconium jet powder).

[0048] Step 2: Add 12.5kg of PVA and 1.05kg of CMC to slurry 1 and continue ball milling to obtain slurry 2;

[0049] Step 3: Input the slurry 2 into the spray granulator for spray granulation to obtain D 25 =11.8μm, part...

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Abstract

The invention relates to blue rare earth zirconium ceramic powder as well as manufacture and application of the blue rare earth zirconium ceramic powder. The blue rare earth zirconium ceramic powder is prepared by ball-milling CoAl2O4, rare earth oxide, Al2O3, ZrO2, rare earth zirconium ceramic powder, rare earth zirconium ceramic precursor, rare earth zirconium ceramic intermediate, water and other materials to obtain slurry, then adding PVA (Polyvinyl Alcohol), CMC (Carboxymethyl Cellulose) and other adhesives and dispersants, and uniformly mixing so as to obtain the blue rare earth zirconium structural ceramic powder, which has blue appearance and is composed of the following components in parts by dry weight: 0.1-10 parts of CoAl2O4, 3.0-8.0 parts of Y2O3, 0.01-3 parts of Gd2O3, 0-3parts of La2O3, 0-3 parts of CeO2, 0-0.1 parts of Pr6O11, 0-0.1 parts of Nd2O3, 0-0.1 parts of Tb4O7, 0-3 parts of Al2O3 and 70-95 parts of ZrO2 based on oxide, 0-20 parts of adhesive and 0-2 parts of dispersant. The blue rare earth zirconium structural ceramic powder is shaped, fired, machined and polished to prepare a blue rare earth zirconium structural ceramic product. According to the invention, the variety of classic blue zirconium ceramic products is increased, the blue zirconium ceramic products are accepted by people due to bright color and use safety characteristics, the quality of life is improved, the aging resistance and other performances of the zirconium ceramic products are enhanced, and the rare earth application field is enlarged.

Description

technical field [0001] The invention relates to a ceramic material, in particular to a colored ceramic material and a preparation method thereof. Background technique [0002] Rare earth zirconium structure ceramic materials have the advantages of high hardness, high strength, good toughness, strong wear resistance and scratch resistance, and are widely used in high-precision, high wear-resistant, high-reliability mechanical parts or electronic components Industry, aerospace, optoelectronic communication, military high-end products and other high-tech fields. Because it also has the characteristics of density, texture and hardness similar to natural gemstones, it has become a new favorite material in high-end civil fields such as ceramic watch accessories, various decorations and ceramic knives. However, since the rare earth zirconium structure ceramic material itself is white and has a single tone, it cannot meet the requirements of various high-end products in various civ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/626C04B35/63
Inventor 龚斌钟晓林刘革命杨惠明王文平李联和谢楠彭牛生
Owner QIANDONG RARE EARTH GRP
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