Preparation method of high wear-resistant ZTA ceramic materials

Abstract

This invention relates to a method for preparing high-wear-resistant ZTA ceramic materials, comprising the following steps: preparing a zirconia / alumina mixed powder; preparing a zirconia / alumina slurry by slowly adding zirconia / alumina powder to a solvent and stirring to obtain a zirconia / alumina slurry; drying the zirconia / alumina slurry, crushing and sieving it to obtain a zirconia / alumina composite powder; preparing a silica sol by adding the zirconia / alumina composite powder and a binder to the silica sol, adding carbon nanofibers, mixing and stirring all materials, ball milling and dispersing for 8 hours to obtain a molding slurry for later use; taking a portion of the molding slurry, adding titanium powder to this portion of the molding slurry and mixing evenly to obtain slurry one; placing woven carbon fibers into a mold, pouring slurry one into the mold, and then pouring the remaining molding slurry into the mold; debinding; and sintering. The method for preparing high-wear-resistant ZTA ceramic materials of this invention can produce ZTA ceramics with good toughness, high hardness, and good wear resistance.

Description

Technical Field

[0001] This invention relates to the field of ceramic materials technology, and in particular to a method for preparing high wear-resistant ZTA ceramics. Background Technology

[0002] ZTA ceramic is a novel composite ceramic material with alumina as the main crystalline phase and metastable tetragonal zirconia as the reinforcing and toughening phase. It utilizes the martensitic phase transformation toughening effect of partially stabilized zirconia ceramic to uniformly disperse metastable zirconia particles into alumina ceramic. This not only suppresses abnormal grain growth during alumina ceramic sintering, but also allows the metastable zirconia to undergo a martensitic phase transformation from tetragonal to monoclinic when the ceramic body is subjected to external stress, thus absorbing the external stress energy. In the preparation of existing ZTA ceramics, zirconia powder and alumina powder need to be mixed evenly before sintering. The direct and uneven mixing of powders affects the toughness, hardness, and wear resistance of ZTA ceramics. Summary of the Invention

[0003] To overcome the technical defects of the existing technology, the present invention provides a method for preparing high wear-resistant ZTA ceramic materials, which can produce ZTA ceramics with good toughness, high hardness and good wear resistance.

[0004] The technical solution adopted in this invention is: a method for preparing high wear-resistant ZTA ceramic material, comprising the following steps,

[0005] S1. Prepare zirconium oxide / alumina mixed powder by mixing zirconium oxide powder and alumina powder;

[0006] S2. Prepare zirconia / alumina slurry by slowly adding zirconia / alumina powder to a solvent and stirring until the zirconia / alumina powder is evenly dispersed in the solvent to obtain zirconia / alumina slurry;

[0007] S3. Dry the zirconium oxide / alumina slurry, crush it, and then sieve it to obtain zirconium oxide / alumina composite powder;

[0008] S4. Prepare silica sol by adding zirconium oxide / alumina composite powder and binder to silica sol, and simultaneously adding carbon nanofibers. Mix and stir all materials, and then ball mill and disperse for 8 hours to obtain a slurry for later use.

[0009] S5. Take a portion of the molding slurry, add titanium powder to the portion of molding slurry and mix evenly to obtain slurry one;

[0010] S6. Place woven carbon fiber into the mold, pour the slurry into the mold, and then pour the remaining molding slurry into the mold;

[0011] S7, Degumming;

[0012] S8, sintering.

[0013] Preferably, the zirconium oxide content in S1 is 20 wt.% and the aluminum oxide content is 80 wt.%.

[0014] Preferably, the solvent in S2 is anhydrous ethanol or ethyl acetate.

[0015] Preferably, the drying temperature in S3 is 80±2℃ and the drying time is 8h.

[0016] Preferably, in S3, the material is crushed and then passed through a 100-mesh sieve.

[0017] Preferably, the S7 degumming process involves heating to 500°C at a heating rate of 0.15-0.5°C / min and then holding at that temperature for 2-5 hours.

[0018] Preferably, the S8 sintering process involves melting and sintering at 1500-1560℃ for 3 hours.

[0019] The beneficial effects of the present invention are as follows: the zirconium oxide and alumina are mixed in a solvent, and after drying, crushing and sieving, zirconium oxide / alumina composite powder is obtained, which improves the dispersibility and binding of zirconium oxide and alumina. The nanofibers added to the slurry can improve the thermal conductivity of ZTA ceramics, and the woven carbon fibers set in the mold improve the toughness and strength of ZTA ceramics. Detailed Implementation

[0020] The present invention will be further described below:

[0021] This embodiment provides a method for preparing a high-wear-resistant ZTA ceramic material, including the following steps.

[0022] S1. Prepare zirconium oxide / alumina mixed powder by mixing zirconium oxide powder and alumina powder;

[0023] S2. Prepare zirconia / alumina slurry by slowly adding zirconia / alumina powder to a solvent and stirring until the zirconia / alumina powder is evenly dispersed in the solvent to obtain zirconia / alumina slurry;

[0024] S3. Dry the zirconium oxide / alumina slurry, crush it, and then sieve it to obtain zirconium oxide / alumina composite powder;

[0025] S4. Prepare silica sol by adding zirconium oxide / alumina composite powder and binder to silica sol, and simultaneously adding carbon nanofibers. Mix and stir all materials, and then ball mill and disperse for 8 hours to obtain a slurry for later use.

[0026] S5. Take a portion of the molding slurry, add titanium powder to the portion of molding slurry and mix evenly to obtain slurry one;

[0027] S6. Place woven carbon fiber into the mold, pour the slurry into the mold, and then pour the remaining molding slurry into the mold;

[0028] S7, Degumming;

[0029] S8, sintering.

[0030] In this embodiment, the zirconium oxide content in S1 is 20 wt.% and the aluminum oxide content is 80 wt.%.

[0031] In this embodiment, the solvent in S2 is anhydrous ethanol or ethyl acetate.

[0032] In this embodiment, the drying temperature in S3 is 80±2℃ and the drying time is 8h.

[0033] In this embodiment, in step S3, the crushed material is passed through a 100-mesh sieve.

[0034] In this embodiment, the S7 degumming process involves heating the temperature to 500°C at a rate of 0.15-0.5°C / min and then holding it at that temperature for 2-5 hours.

[0035] In this embodiment, the S8 sintering process is carried out by melting and sintering at 1500-1560℃ for 3 hours.

[0036] In this embodiment, zirconium oxide and alumina are mixed in a solvent, and after drying, crushing, and sieving, zirconium oxide / alumina composite powder is obtained, which improves the dispersibility and bonding of zirconium oxide and alumina. The nanofibers added to the slurry can improve the thermal conductivity of ZTA ceramics, and the woven carbon fibers set in the mold can improve the toughness and strength of ZTA ceramics. The structural layer formed on the surface of ZTA ceramics by the slurry helps the metallization of ZTA ceramics. The titanium powder in it combines with the metal material during the metallization process, so that the metal material can be tightly bonded to ZTA ceramics.

[0037] The ceramic material in the comparative example did not contain nanofibers, woven carbon fibers, or titanium powder. This ceramic material was manufactured using the process described in this embodiment (where S6 does not include setting woven carbon fibers into the mold, and the nanofibers in S4 are replaced with alumina powder). The high wear-resistant ZTA ceramic material prepared by this invention and the ceramic material in the comparative example were tested. During the peel strength test, copper plates of the same specifications were brazed onto the ceramic materials of the comparative example and this embodiment.

[0038] The table below shows the performance test results.

[0039]

[0040] As shown in the table above, the high wear-resistant ZTA ceramic material prepared by this invention has good thermal conductivity, toughness and strength, and can be tightly bonded to metal materials with high peel strength.

[0041] The foregoing has shown and described the basic principles and main features of the present invention, as well as its advantages. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A method for preparing high wear-resistant ZTA ceramic materials, characterized in that: Includes the following steps, S1. Prepare zirconium oxide / alumina mixed powder by mixing zirconium oxide powder and alumina powder; S2. Prepare zirconia / alumina slurry by slowly adding zirconia / alumina powder to a solvent and stirring until the zirconia / alumina powder is evenly dispersed in the solvent to obtain zirconia / alumina slurry; S3. Dry the zirconium oxide / alumina slurry, crush it, and then sieve it to obtain zirconium oxide / alumina composite powder; S4. Prepare silica sol by adding zirconium oxide / alumina composite powder and binder to silica sol, and simultaneously adding carbon nanofibers. Mix and stir all materials, and then ball mill and disperse for 8 hours to obtain a slurry for later use. S5. Take a portion of the molding slurry, add titanium powder to the portion of molding slurry and mix evenly to obtain slurry one; S6. Place woven carbon fiber into the mold, pour the slurry into the mold, and then pour the remaining molding slurry into the mold; S7, Degumming; S8, sintering.

2. The method for preparing high wear-resistant ZTA ceramic material according to claim 1, characterized in that: The zirconium oxide content in S1 is 20 wt.%, and the aluminum oxide content is 80 wt.%.

3. The method for preparing high wear-resistant ZTA ceramic material according to claim 1, characterized in that: The solvent in S2 is anhydrous ethanol or ethyl acetate.

4. The method for preparing high wear-resistant ZTA ceramic material according to claim 1, characterized in that: The drying temperature in S3 is 80±2℃, and the drying time is 8h.

5. The method for preparing high wear-resistant ZTA ceramic material according to claim 1, characterized in that: In S3, the crushed material passes through a 100-mesh sieve.

6. The method for preparing high wear-resistant ZTA ceramic material according to claim 1, characterized in that: The S7 degumming process involves heating to 500°C at a rate of 0.15-0.5°C / min and then holding at that temperature for 2-5 hours.

7. The method for preparing high wear-resistant ZTA ceramic material according to claim 1, characterized in that: The S8 sintering process involves melting and sintering at 1500-1560℃ for 3 hours.

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