In-situ synthesized mullite whisker toughened 90 alumina ceramic and preparation method thereof

A technology of mullite whiskers and alumina ceramics, which is applied in the field of in-situ synthesis of mullite whiskers toughened 90 alumina ceramics and its preparation, can solve the problems of limited product adaptability and poor material compactness, etc. Achieve the effect of improving the softening point under load, good air tightness, and realizing large-scale industrial production

Active Publication Date: 2016-11-30
江西省工业陶瓷工程技术研究中心
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  • Abstract
  • Description
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Problems solved by technology

[0004] In terms of in-situ toughening alumina ceramics with mullite whiskers, the current literature and patents are limited to laboratory results, which cannot meet the needs of actual industrial production, and in many cases are based on the theoretical composition of mullite ——75% Al 2 o 3 , 25% SiO 2 Because the synthesis reaction of mullite is expansive, the volu

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  • In-situ synthesized mullite whisker toughened 90 alumina ceramic and preparation method thereof
  • In-situ synthesized mullite whisker toughened 90 alumina ceramic and preparation method thereof
  • In-situ synthesized mullite whisker toughened 90 alumina ceramic and preparation method thereof

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Embodiment 1

[0033]A preparation method for in-situ synthesis of mullite whisker toughened 90 alumina ceramics, using 85 wt% α-alumina powder and 15 wt% silica powder as raw materials, and 18% trihydrate trihydrate Aluminum fluoride and 1% dry base titanium dioxide (pure titanium dioxide) by weight of raw materials are used as catalysts. Dry base titanium dioxide is generally added in the form of titanium dioxide sol. The amount of titanium dioxide sol added depends on the conversion of titanium dioxide concentration in the sol. The raw materials and catalysts are mixed in proportion , using water as the medium for ball milling for 24 hours, then adding 2% polyvinyl alcohol by weight of raw materials as a binder, after mixing for 30 minutes, adopting spray drying method to granulate, aging for 24 hours, and then adopting isostatic pressing dry method Forming is pressed into a green body under a pressure of 110 MPa, and the green body is refined, and the refined green body is raised to 1650 ...

Embodiment 2

[0036] A preparation method for in-situ synthesis of mullite whisker toughened 90 alumina ceramics, using 88wt% α-alumina powder and 12wt% silica powder as raw materials, and 18% fluorine trihydrate by weight of raw materials Aluminum powder and dry base titanium dioxide (pure titanium dioxide) with a weight of 1.5% of raw materials are used as catalysts. Dry base titanium dioxide is generally added in the form of titanium dioxide sol. The amount of titanium dioxide sol added depends on the conversion of titanium dioxide concentration in the sol. The raw materials and catalysts are mixed in proportion , using water as the medium for ball milling for 36 hours, then adding 1% polyvinyl alcohol by weight of the raw materials as a binder, mixing for 30 minutes, granulating by spray drying, aging for 24 hours, and then using isostatic pressing dry method Forming Press the green body under the pressure of 90 MPa, refine the green body, raise the temperature of the refined green body ...

Embodiment 3

[0039] A preparation method for in-situ synthesis of mullite whisker toughened 90 alumina ceramics, using 90 wt% α-alumina powder and 10 wt% silica powder as raw materials, and 10% trihydrate trihydrate Aluminum fluoride powder and dry base titanium dioxide (pure titanium dioxide) with a weight of 1.5% of the raw material are used as catalysts. Dry base titanium dioxide is generally added in the form of titanium dioxide sol. The amount of titanium dioxide sol added depends on the concentration of titanium dioxide in the sol. Ratio matching, ball milling with water as medium for 36 hours, then adding 2% polyvinyl alcohol by raw material weight as binder, after mixing for 30 minutes, adopting spray drying method to granulate, aging for 24 hours, and then using isostatic pressing Dry forming is pressed into a green body under a pressure of 100 MPa, and the green body is refined, and the refined green body is raised to 1600 °C at a heating rate of 2 °C / min, kept for 6 hours, and th...

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Abstract

The invention discloses a preparation method of an in-situ synthesized mullite whisker toughened 90 alumina ceramic. The method consists of: taking 85-95wt% of highly dispersed alpha-alumina powder and 5-15wt% of highly dispersed silicon dioxide powder as the raw materials, adopting aluminum fluoride trihydrate powder accounting for 4-18% of the weight of the raw materials and dry basis titanium dioxide accounting for 0.5-3% of the weight of the raw materials as the catalysts, mixing the raw materials with the catalysts, then using water as the medium to perform ball-milling so as to form an Al2O3-SiO2 precursor containing AlF3 and TiO2, then adding polyvinyl alcohol accounting for 1-3% of the weight of the raw materials to serve as the adhesive, conducting mixing, then employing spray drying process to perform granulation and ageing, then conducting isostatic pressing dry process forming, and performing high temperature firing so as to obtain the mullite whisker toughened 90 alumina ceramic. According to the invention, adding of expensive whiskers is unnecessary, a complicated dispersion process of additional adding of whiskers is omitted, also the preparation process is simple, the obtained whiskers have large length, high length-diameter ratio and uniform dispersion, and the method is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic ceramics. Specifically relates to an in-situ synthesis of mullite whisker toughened 90 alumina ceramics and a preparation method thereof. Background technique [0002] Alumina ceramics and refractory materials have the characteristics of high mechanical strength, high hardness, wear resistance, high temperature resistance, corrosion resistance, high electrical insulation and low dielectric loss, and are widely used in aerospace, aviation, engine wear parts, cutting tools, etc. , has very broad application prospects. However, due to its fatal weaknesses such as high brittleness and poor uniformity, it affects the reliability and safety of ceramic parts. Therefore, improving the toughness of alumina ceramics is an important issue that needs to be solved urgently. At present, the commonly used methods of toughening alumina ceramics include phase transformation toughening, particle di...

Claims

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Application Information

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IPC IPC(8): C04B35/81C04B35/10C04B35/634
CPCC04B35/10C04B35/63416C04B35/80C04B2235/3232C04B2235/445C04B2235/5228C04B2235/96
Inventor 李发亮张海军张少伟陈子瑛钟翔刘奇曹南萍
Owner 江西省工业陶瓷工程技术研究中心
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