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Preparation method of mosaic structure zirconium tungstate/zirconium oxide composite powder

A technology of inlaid structure and composite powder, applied in the field of ceramic composite materials, can solve the problems of debonding and loss of bonding properties at the interface of composite materials, and achieve the effect of inhibiting crack growth, offsetting interface debonding, and ensuring mechanical properties.

Active Publication Date: 2022-07-26
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the sintering process, polyvinyl alcohol, as an organic compound, will volatilize as the temperature rises, thus losing its adhesive properties
Therefore, this mixing method still cannot solve the problem of interfacial debonding of composite materials.

Method used

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  • Preparation method of mosaic structure zirconium tungstate/zirconium oxide composite powder
  • Preparation method of mosaic structure zirconium tungstate/zirconium oxide composite powder
  • Preparation method of mosaic structure zirconium tungstate/zirconium oxide composite powder

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specific Embodiment approach 1

[0033] A method for preparing a mosaic-structure zirconium tungstate / zirconia composite powder, comprising the following steps:

[0034] Step 1: Weigh the nano-zirconia powder according to the mass ratio of zirconium tungstate to zirconia in a ratio of 2:1 to 4:1, and prepare the nano-zirconia powder into an aqueous solution;

[0035] Step 2, take by weighing zirconium oxychloride octahydrate and sodium tungstate dihydrate according to the stoichiometric ratio of zirconium tungstate, and prepare equal volumes of zirconium oxychloride aqueous solution and sodium tungstate aqueous solution respectively;

[0036] Step 3, under the state of stirring the aqueous solution of Step 1, add the two solutions prepared in Step 2 to the solution prepared in Step 1 synchronously;

[0037] Step 4. Put the solution prepared in Step 3 into a water bath environment of 60-70°C and stir for 30-60min;

[0038] Step 5. Add 11-13 mol / L of hydrochloric acid to the solution prepared in step 4 until t...

Embodiment 1

[0051] A method for preparing a mosaic-structure zirconium tungstate / zirconia composite powder, comprising the following steps:

[0052] Weigh the nano-zirconia powder according to the ratio of zirconium tungstate to zirconia mass ratio of 2:1, according to the ratio of the concentration of sodium dodecylbenzene sulfonate in the final precursor suspension to 50g / L. Sodium dialkylbenzenesulfonate is mixed with the nano-zirconia powder, placed in deionized water, and ultrasonically dispersed to prepare mixed solution A (zirconia and sodium dodecylbenzenesulfonate solution). Weigh zirconium oxychloride octahydrate and sodium tungstate dihydrate according to the stoichiometric ratio of zirconium tungstate, and prepare equal volumes of solution B (zirconium oxychloride solution) and solution C (sodium tungstate aqueous solution). Under the premise that the solution A is continuously stirred, the solutions B and C are simultaneously added to the solution A to prepare the solution D ...

Embodiment 2

[0055] A method for preparing a mosaic-structure zirconium tungstate / zirconia composite powder, comprising the following steps:

[0056] According to the ratio of zirconium tungstate to zirconia mass ratio of 2:1, the nano-zirconia powder was weighed, placed in deionized water, and prepared into solution A (zirconia solution). Weigh zirconium oxychloride octahydrate and sodium tungstate dihydrate according to the stoichiometric ratio of zirconium tungstate, and prepare equal volumes of solution B (zirconium oxychloride solution) and solution C (sodium tungstate aqueous solution). Under the premise that the solution A is continuously stirred, the solutions B and C are simultaneously added to the solution A to prepare the solution D (initial precursor solution). According to the ratio that the concentration of sodium dodecylbenzenesulfonate in the final precursor suspension is 50g / L, the sodium dodecylbenzenesulfonate is weighed and directly added to solution D, and stirred in a...

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Abstract

A preparation method of mosaic structure zirconium tungstate / zirconium oxide composite powder belongs to the field of ceramic composite materials, and comprises the following specific steps: synchronously adding a zirconium oxychloride aqueous solution and a sodium tungstate aqueous solution which are equal in volume into a nano zirconium oxide aqueous solution; stirring in a water bath environment at 60-70 DEG C; hydrochloric acid is added into the prepared solution until the hydrogen ion concentration is 2-3 mol / L, heat preservation and stirring are continued, a precursor suspension of the composite powder is obtained, and sodium dodecyl benzene sulfonate is added into the precursor suspension or in any step before the precursor solution is obtained; and putting the precursor suspension into a reaction kettle, sealing, carrying out heat preservation for at least 500 minutes in an environment of 175-185 DEG C, cooling, collecting powder precipitates, carrying out alcohol aging, washing and drying, and then calcining at 450-600 DEG C to obtain the zirconium tungstate / zirconium oxide composite powder with the mosaic structure. The method effectively inhibits interface debonding of the composite material after thermal strain.

Description

technical field [0001] The invention belongs to the field of ceramic composite materials, and in particular relates to a process for preparing zirconium tungstate / zirconia composite powder, in particular to a preparation method for a mosaic structure zirconium tungstate / zirconia composite powder. Background technique [0002] New composite materials with low / near-zero coefficient of expansion (CTE) can be neutralized due to physical thermal expansion effects to maintain the dimensional accuracy of parts, so they have huge potential in technological fields such as perovskite electrode materials, deep space exploration, and semiconductor packaging materials. application potential. However, near-zero-expansion composites can cause crack propagation at rapidly changing temperatures due to thermal strain mismatch at the two-phase interface, which reduces the reliability of the composites. Therefore, designing and fabricating composites with excellent mechanical properties and ze...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/626C04B35/628
CPCC04B35/495C04B35/62605C04B35/62823C04B2235/3244C04B2235/326C04B2235/5454
Inventor 王晓飞李金平杨程孟松鹤易法军解维华许承海方国东杨强
Owner HARBIN INST OF TECH
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