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Shell porous silicate, preparation method thereof and friction material containing same

A silicate and shell technology, used in the field of silicate, to achieve good heat resistance and wear resistance, eliminate static charges, and improve permeability.

Inactive Publication Date: 2012-04-25
隗学礼
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But about the silicate of shell porous structure characteristic of the present invention and preparation method thereof also do not see report

Method used

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  • Shell porous silicate, preparation method thereof and friction material containing same
  • Shell porous silicate, preparation method thereof and friction material containing same
  • Shell porous silicate, preparation method thereof and friction material containing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In a 5L autoclave, first put 3620g of water, then add quartz powder (containing SiO 2 Accounting for 98%) 147.8g, unslaked lime (containing CaO and accounting for 96%) 138g, and metal silicon powder (containing more than Si99%) 2.8g, stir and mix well, seal the reaction kettle lid, heat the kettle with a heating rate of 2°C / min. Heating up to 200°C, pressure 16Kg / cm 2 Next, keep warm for 6 hours. During the process of heating up and keeping warm, in order to prevent the precipitation of the reaction product, the paddles will keep stirring at a stirring speed of 220rpm. Stop heating after keeping warm, and cool down with the furnace. After cooling, the product was taken out, washed with water, filtered, and dried in an electric oven at 120° C. for 8 hours to obtain 180 g of white powder with a bulk density of 86 g / L. According to X-ray diffraction analysis, its main component is the chemical formula Ca 6 Si 6 o 17 (OH) 2 , and contains 6wt.% CaSiO 3 .H 2 Silicate ...

Embodiment 2

[0027] In a 5L autoclave, first put 3697g of water, then add quartz powder (SiO 2 account for more than 98%) 53.1g, unslaked lime (CaO purity 96%) 49.6g, and metal silicon powder (containing more than Si99%) 1.0g, stir and mix well, seal the reaction kettle lid, with the heating rate of 1.8 ℃ / min. The temperature of the kettle is raised to 210°C, and the pressure is 20Kg / cm 2 Next, keep warm for 6 hours. During the process of heating up and keeping warm, the blades keep stirring at a stirring speed of 230rpm. Stop heating after keeping warm, and cool down with the furnace. After cooling, the product was taken out, washed with water, filtered, and dried in an electric oven at 130° C. for 6 hours to obtain 102 g of white powder with a bulk density of 110 g / L. According to X-ray diffraction analysis, its main component is the chemical formula Ca 6 Si 6 o 17 (OH) 2 , and contains 5wt.% CaSiO 3 .H 2 O represents the silicate. The product was observed with a scanning electro...

Embodiment 3

[0029] In a 5L high-pressure reactor, put 3619g of water first, and then add SiO 2 (Analytical pure) 81g, Ca(OH) 2(Analytical pure) 100g, and metal silicon powder (containing more than 99% Si) 1.8g, stir and mix well, seal the lid of the reaction kettle, heat the kettle to 200°C at a heating rate of 2°C / min, and pressure 16Kg / cm 2 Keep it warm for 6 hours. During the heating and heat preservation process, the paddles keep stirring at a stirring speed of 230 rpm. After the heat preservation finishes, stop heating and cool down with the furnace. After cooling, the product was taken out, washed with water, filtered, and dried in an electric oven at 120° C. for 8 hours to obtain 157 g of white powder with a bulk density of 95 g / L. According to X-ray diffraction analysis, its main component is the chemical formula Ca 6 Si 6 o 17 (OH) 2 , and contains 6wt.% CaSiO 3 .H 2 O represents the silicate. Observing the product with a scanning electron microscope, the morphological fe...

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Abstract

The invention discloses silicate of special crystal morphology, in particular a porous spherical material enclosed by closed shells woven by needle-like crystal chopped fibers. The bulk density of the material is 20 to 200g / L, the average size of the material is 1 to 1,000 micrometers, the main ingredient of the material is Ca6Si6O17(OH)2, and the material also contains 1 to 20 weight percent of CaSiO3.H2O. The material of the invention is manufactured by using a calcium compound and a silicon compound as raw materials, wherein the raw materials are uniformly mixed in a mol ratio of Ca<2+> to Si<4+> of 0.8 to 1.2; metal powder and water, which serve as reaction promoters are added into the raw materials; and the hydro-thermal synthesis is performed for 30 to 24 hours in a high-pressure reaction kettle under the conditions of stirring, a temperature rise speed of 0.2 to 3 DEG C / min, a constant temperature of 160 to 280 DEG C and a constant pressure of 6 to 68 Kg / cm<2>, and the product of the reaction is washed, filtered out and dried to give the finished product. The shell porous silicate of the invention has high heat resistance, high wear resistance, little wear and no noises, can be used as the friction material of the braking devices of automobiles, trains and air planes and is the optimal product for substituting asbestos. The material and the preparation process of the invention cause little environmental pollution and are suitable for industrial production.

Description

technical field [0001] The present invention relates to a silicate with a special crystal morphology, especially a porous spherical silicate surrounded by a closed shell woven by needle-like crystal short fibers, and a preparation method for the silicate with a special crystal morphology. It also relates to a friction material containing it. Background technique [0002] In the past, the friction materials used as brake components were mostly asbestos dispersed in organic or inorganic binders. However, these materials do not have sufficient heat resistance and wear resistance. If the coefficient of friction is unstable, the friction resistance is poor, especially in the high temperature area, these properties will drop significantly, which will lead to its greater attenuation. When the brakes are applied, the contact of the friction material with the high-speed brake pads causes a loud "brake noise". At the same time, asbestos is a known carcinogen, and its dust can cause...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/24
Inventor 隗学礼赵宽放隗益民
Owner 隗学礼
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