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Cr2O3/ZTA composite powder and ceramic and preparing method thereof

A technology of composite powder and composite ceramics, which is applied in the field of preparation of inorganic materials, can solve the problems that ZTA ceramic devices cannot meet, and achieve the effect of high hardness and high toughness

Inactive Publication Date: 2017-09-22
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the improvement of industrial level, commonly used ZTA ceramic devices cannot meet the needs of aerospace, transportation and other technical fields

Method used

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  • Cr2O3/ZTA composite powder and ceramic and preparing method thereof
  • Cr2O3/ZTA composite powder and ceramic and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] a) According to the steps of preparing ZTA powder, weigh alumina powder and 3Y-ZrO 2 Powder, of which alumina powder 85g, 3Y-ZrO 2 Powder 15g, Cr(NO 3 ) 3 .9H 2 O crystal 6.84g, of which 6.84gCr(NO 3 ) 3 .9H 2 Cr in O 3+ The molar concentration of 0.5g Cr2 o 3 Cr in 3+ The molar concentrations are equal, and these three powders are poured into a polytetrafluoroethylene ball mill tank;

[0053] b) Add 280 g of zirconia balls as a ball milling medium to a polytetrafluoroethylene ball milling tank, and add 120 g of absolute ethanol as a ball milling medium. The mixture was ball milled on a planetary mill for 24 hours and then mixed to obtain a slurry for subsequent use;

[0054] c) Pour the mixed slurry into a plastic container, put it in an oven and bake it at 85°C for 12 hours, then pour the dried mixed powder into a zirconia crucible, and heat it in an electric furnace at 500°C Keep warm for 1-2 hours and then cool with the furnace to get Cr 2 o 3 / ZTA comp...

Embodiment 2

[0058] a) According to the steps of preparing ZTA powder, weigh alumina powder and 3Y-ZrO 2 Powder, wherein alumina powder 80g, 3mol% Y 2 o 3 -ZrO 2 Powder 20g, Cr(NO 3 ) 3 .9H 2 O crystal 10.94g, of which 10.94gCr(NO 3 ) 3 .9H 2 Cr in O 3+ The molar concentration of 0.8g Cr 2 o 3 Cr in 3+ The molar concentrations are equal, and these three powders are poured into a polytetrafluoroethylene ball mill tank;

[0059] b) Add 280 g of zirconia balls as a ball milling medium to a polytetrafluoroethylene ball milling tank, and add 120 g of absolute ethanol as a ball milling medium. The mixture was ball milled on a planetary mill for 24 hours and then mixed to obtain a slurry for subsequent use;

[0060] c) Pour the mixed slurry into a plastic container, put it in an oven and bake it at 85°C for 12 hours, then pour the dried mixed powder into a zirconia crucible, and heat it in an electric furnace at 500°C Keep warm for 1-2 hours and then cool with the furnace to get Cr ...

Embodiment 3

[0064] Basically the same as embodiment 1, the difference is only that Cr 2 o 3 The content is 0.08wt.%.

[0065] The SEM images of the prepared ZTA ceramics are as follows figure 1 As shown in (a), it can be seen that zirconia is uniformly dispersed in alumina, and there are almost no pores. The XRD pattern of the prepared ZTA ceramics is as follows figure 2 As shown in (B), it can be seen that it is pure tetragonal zirconia and hexagonal alumina, without Cr 2 o 3 The presence. After testing, the ZTA ceramic has a hardness of 1772MPa and a toughness of 4.52MPa.m 1 / 2 .

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Abstract

The invention relates to a Cr2O3 / ZTA composite powder and ceramic and a preparing method thereof. The preparing method comprises the following steps that alumina powder, zirconium oxide powder and Cr(NO3)3.9H2O are mixed and subjected to ball milling, and mixed paste is obtained, wherein the mass fraction of alumina powder is 80-85% of the total mass of zirconium oxide and alumina, the balance 15-20% is zirconium oxide powder, and the adding amount of Cr(NO3)3.9H2O, converted base on Cr2O3, is 0-0.8% of the total mass of zirconium oxide and alumina; the obtained mixed paste is dried and then roasted at 400-600 DEG C, and Cr2O3 / ZTA powder is obtained. The Cr2O3 additive is introduced in the mode of precursor Cr(NO3)3.9H2O, and thus Cr2O3 can be more evenly dispersed into ZTA powder.

Description

technical field [0001] The present invention relates to a kind of preparation method of the inorganic material of high hardness, high toughness, particularly relate to a kind of former precursor Cr(NO 3 ) 3 .9H 2 O way to introduce Cr 2 o 3 And make the chromium oxide evenly dispersed in ZTA ceramic preparation method. Background technique [0002] Zirconia toughened alumina ceramics (ZTA) refers to a new type of composite material with alumina as the main raw material and partially stabilized zirconia as the strengthening and toughening phase. Alumina and zirconia form a system. With the help of phase transformation and toughening of zirconia ceramics, they form a composite phase with alumina to give full play to the high hardness, corrosion resistance, high temperature resistance and improve their brittleness of alumina and zirconia ceramics. It has excellent mechanical properties. In view of the advantages of high hardness, corrosion resistance and low price, ZTA ce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/626C04B35/622
CPCC04B35/10C04B35/622C04B35/626C04B2235/3241C04B2235/3244C04B2235/9692
Inventor 夏金峰王新刚徐兵蒋丹宇粘洪强周国红王士维
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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