Retaining seal material and production method thereof

A sealing material and fastening technology, which is applied in the field of preparation of alumina fiber aggregates, can solve the problems of not being able to obtain quality stable fastening sealing materials and the like

Inactive Publication Date: 2005-11-02
IBIDEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is impossible to obtain a fastening sealing material excellent in quality stability

Method used

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  • Retaining seal material and production method thereof
  • Retaining seal material and production method thereof
  • Retaining seal material and production method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0273] According to the production method of the embodiment of the first group of the present invention, the calcination step of sintering the precursor fibers is performed by heating the precursor fibers in an environment where the oxidation reaction of the carbon component contained in the precursor fibers is difficult to occur. Therefore, this makes it possible to retain a large amount of carbon components in the alumina-silica fiber 6, thus ensuring that the alumina-silica fiber 6 excellent in mechanical strength is easily obtained.

[0274] According to the preparation method of the first embodiment of the present invention, the environment for the calcination step adopts an inexpensive nitrogen atmosphere. Therefore, this can reduce the production cost of the fastening sealing material 4 . In addition, since the heating step is performed within the preferred calcination temperature range, this can stably obtain high-strength aluminum-silicon fibers 6 .

[0275] Accordin...

Embodiment 1

[0534] In Example 1, first, an alkaline aqueous solution of aluminum chloride (23.5% by weight), silica sol (20% by weight, the particle size of silica is 15 nm) and polyvinyl alcohol (10% by weight) were mixed so that A spinning stock solution is prepared, and the polyvinyl alcohol is a spinning performance imparting agent. Then, the resulting spinning stock solution was concentrated using an evaporator under vacuum at 50° C. to prepare a spinning stock solution having a concentration of 38% by weight and a viscosity of 1500 poise.

[0535] After the spinning stock solution is prepared, the spinning stock solution is continuously discharged into the air through the nozzles (perfect circular cross-section) of the spinning equipment, and the obtained precursor fiber is taken up while stretching.

[0536] Next, carry out heating step (pretreatment) to described precursor fiber, heat 30 minutes with electric furnace in 250 ℃, normal pressure and nitrogen atmosphere, then in the s...

Embodiment 2 and 3

[0545] In Examples 2 and 3, Al-Si fibers 6 were prepared in substantially the same order as in Example 1, except that the temperature and time of calcination were changed as shown in Table 1. As a result, aluminum silicon fibers 6 excellent in mechanical strength can be obtained.

[0546] In addition, when the samples for the surface pressure test were formed, the initial surface pressure, the surface pressure after the durability test, and the rate of decrease in the surface pressure with time were measured for these samples, and the optimal pressure was obtained in the same manner as in Example 1. results (see Table 1).

[0547] Of course, no changes in color and residual carbon content were observed.

[0548] In addition, a fastening sealing material 4 was prepared to manufacture a catalytic converter 1 , and a continuous running test was carried out after the catalytic converter 1 was equipped. As a result, during running, no noise was generated, and the catalyst carrier...

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Abstract

An object of the present invention is to provide a manufacturing method by which alumina-silica based fibers excellent in mechanical strength can be readily and securely obtained, and the present invention obtains precursor fibers as a material by using an alumina-silica based fiber spinning stock solution for use in an inorganic salt method. Next, the precursor fibers are heated under an environment which makes it difficult to carry out an oxidizing reaction on the carbon component contained in the precursor fibers. Thus, the precursor fibers are sintered to obtain alumina-silica based fibers.

Description

[0001] This application is a divisional application, the international application number of the original application is PCT / JP02 / 05124, the Chinese national application number is 02801846.X, the application date is May 27, 2002, and the invention name is "aluminum silicon fiber, ceramic fiber , ceramic fiber aggregate, fastening and sealing material and preparation method thereof, and preparation method of alumina fiber aggregate". technical field [0002] The invention relates to aluminum-silicon fiber, ceramic fiber, ceramic fiber aggregate, fastening and sealing material and its preparation method, and the preparation method of alumina fiber aggregate. Background technique [0003] Exhaust gas emitted from internal combustion engines of vehicles such as buses, trucks, and construction machinery contains fine particles that affect the environment and the human body, which has become a problem. [0004] Various existing ceramic fibers allow exhaust gas to pass through poro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01J33/00B01J35/06C04B35/80D04H1/4234F01N3/28
CPCC04B35/634C04B2235/5264C04B2235/3218F01N2330/14C04B35/803F01N2350/04C04B2235/6567C04B2235/422F01N3/2853C04B2235/80C04B2235/9661C04B2235/96F01N3/2864B82Y30/00C04B2235/3418D01F9/10F01N2330/06C04B35/00C04B2235/526C04B2235/5284D01D5/04C04B2235/656C04B35/117C04B35/62245C04B2235/658D01D5/253Y10T428/2973C04B35/80
Inventor 棚桥一智堂下正景高桥秀智
Owner IBIDEN CO LTD
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