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Lepidocrosite type potassium magnesium titanate and method for production thereof, and friction material

A technology of potassium magnesium titanate and friction material, which is applied in the directions of titanate, friction lining, chemical instruments and methods, etc., can solve the problems of poor heat resistance, increased wear, and reduced wear resistance in high temperature areas.

Inactive Publication Date: 2003-09-24
OTSUKA CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the contact temperature between the brake pad and the brake pad is as high as 1,000°C or higher, its heat resistance sometimes deteriorates when it is used continuously for more than tens of hours for a long time, which may lead to a decrease in wear resistance and wear in the high temperature area volume increase

Method used

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  • Lepidocrosite type potassium magnesium titanate and method for production thereof, and friction material
  • Lepidocrosite type potassium magnesium titanate and method for production thereof, and friction material
  • Lepidocrosite type potassium magnesium titanate and method for production thereof, and friction material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] (1) Synthesis of KTMO-a

[0064] 1473 grams of titanium dioxide, 638 grams of potassium carbonate, 1003 grams of potassium chloride, 279 grams of magnesium hydroxide, and 200 milliliters of water were mixed together as a binder. Using a hydraulic press (manufactured by Ymamoto Tekkosho, Co., Ltd.), the mixture was pressed into a brick shape under a pressure of 14.7 MPa. The brick was calcined at 1050° C. for 1 hour in an electric furnace (manufactured by Advvantech Toyo Co., Ltd.), and then gradually cooled. The calcined product was pulverized to obtain a white powder, the arithmetic mean of the long diameter and the short diameter was 3 micrometers, the average thickness was 300 nm, and the ratio of the long diameter to the short diameter was 1.5. Using the FP (basic parameter) method, through fluorescent X-ray analysis, the composition of this white powder is determined to be K 0.8 Mg 0.4 Ti 1.6 o 4 .

[0065] Figure 2 is the X-ray diffraction spectrum of the ob...

Embodiment 2

[0073] With 20 parts of KTMO (KTMO) obtained in embodiment 1 0.8 Mg 0.4 Ti 1.6 o 3.8 ), 10 parts of aramid fiber (product name: Kevlar Pulp, average fiber length 3 mm), 20 parts of phenol resin (binder) and 50 parts of barium sulfate are mixed. The mixture was preformed at room temperature with a pressure of 29.4Mpa for 1 minute, then applied a pressure of 14.7Mpa in a mold at 170°C for 5 minutes to combine, and then heat-treated at 180°C for 3 hours. The molded product was taken out from the mold and polished to form a pad A (JISD 4411 test piece).

Embodiment 3

[0094] Synthesis of KTMO of the present invention

[0095] Using the KTMO-a obtained in Example 1(1), 80 liters of a 2% aqueous slurry was prepared, and then 126 g of a 76% aqueous sulfuric acid solution was added thereto. The slurry was stirred for 2 hours, then its pH was adjusted to 8.5. The aqueous slurry is processed with a centrifuge. The obtained centrifugal cake (solid) was taken out, dried at 110° C. for 5 hours, and then calcined in an electric furnace at 600° C. for 12 hours. The calcined product was gradually cooled, and then passed through a 20-mesh sieve to obtain a white powder, the arithmetic mean of its long diameter and short diameter was 3 microns, the average thickness was 300 nm, and the ratio of long diameter to short diameter was 1.5. Using the FP method, the composition of this white powder was determined to be K by fluorescent X-ray analysis. 0.87 Mg 0.4 Ti 1.6 o 3.95 . Its melting point was also found to be about 1372°C.

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Abstract

Lepidocrocite potassium magnesium titanate having a composition represented by the formula K0.2-0.7Mg0.4Ti1.6O3.7-4 and obtainable by subjecting an aqueous slurry of lepidocrocite potassium magnesium titanate having a composition represented by the formula K0.8Mg0.4Ti1.6O4 to an acid treatment and subsequent calcination. <IMAGE>

Description

technical field [0001] The invention relates to lepidocrocite potassium magnesium titanate (lepidocrocite potassium magnesium) and a preparation method thereof, and also relates to a friction material. technical background [0002] Friction materials previously used to form brake components used asbestos in a form dispersed in and bound by organic or inorganic binders. However, these materials do not have sufficient heat resistance and wear resistance properties such as coefficient of friction and abrasion resistance, which are reduced in a high temperature region, causing their deterioration phenomenon to frequently occur when braking is applied. When the brakes are applied, the contact of the friction material with the high-speed brake pads causes frequent occurrence of "brake noise". Asbestos is a known carcinogen and is easily dusted. The use of asbestos has been increasingly restricted in view of such environmental hygiene problems that operators inhale asbestos durin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00C08K3/22F16D69/02
CPCC01G23/003C01P2002/60C01P2002/72C01P2002/88C01P2004/03C01P2004/20C01P2004/45C01P2004/61F16D69/02F16D2200/0065C01G23/00
Inventor 小川博高桥滋男糸井伸树稲田幸辅
Owner OTSUKA CHEM CO LTD
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