Honeycomb-shaped silicon carbide ceramic carrier, and preparation method and application thereof

A technology of silicon carbide ceramics and the first silicon carbide powder, which is applied in the direction of ceramic products, catalyst carriers, chemical instruments and methods, etc., can solve the problems of small water absorption performance of silicon carbide, low porosity, and less catalytic tail gas, etc., and achieve increased Water absorption performance, good water absorption performance, beneficial to the load effect

Active Publication Date: 2017-05-10
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(5) Larger specific surface area: The size of the specific surface area determines its catalytic efficiency. The larger the specific surface area, the higher the catalytic efficiency per unit time. On the contrary, the lower the specific surface area, the less exhaust gas is catalyzed per unit time. The conversion rate lower
(6) Does not contain substances that poison the catalyst: if it contains substances that poison the catalyst, it will lead to a decr

Method used

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  • Honeycomb-shaped silicon carbide ceramic carrier, and preparation method and application thereof
  • Honeycomb-shaped silicon carbide ceramic carrier, and preparation method and application thereof
  • Honeycomb-shaped silicon carbide ceramic carrier, and preparation method and application thereof

Examples

Experimental program
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Example Embodiment

[0041] Example 1

[0042] (1) Weigh 90 g of silicon carbide powder with a particle size of 50-65 μm, 10 g of silicon carbide powder with a particle size of 10-40 μm, 12 g of silica-alumina-based clay, 2 g of hydroxypropyl methylcellulose, and 3 g of polyethylene oxide. Place the prepared honeycomb ceramic powder in a mixer and dry mix for 0.5 hours.

[0043] (2) Mix 3 g of soybean oil and 30 g of water, stir evenly to obtain a solution; pour the solution into the stirred ceramic powder, and fully mix in a mixer for 0.5 hours to obtain a plastic mud. After the mud is smelted and evacuated, it is put into an extruder for extrusion molding to obtain a honeycomb silicon carbide blank. The size and shape of the blank are controlled by the die in the extrusion molding equipment.

[0044] (3) Place the green body in a cool and dry environment for 2 days, then place the dried honeycomb green body at 60°C for 6 hours, and then heat up to 105°C for 8 hours; The sample was heated from ...

Example Embodiment

[0046] Example 2

[0047] The proportion of silicon carbide powder in this example is shown in Table 1, and other preparation methods are the same as those in Example 1.

[0048] After testing, the apparent porosity of the honeycomb silicon carbide ceramic prepared in this example is 43%, and the porosity is 69%; the compressive strength A direction is 44Mpa, and the compressive strength B direction is 12Mpa; The temperature was raised to 650 ℃ / min, and after 30 minutes of heat preservation, it was taken out and cooled in the air to the greenhouse for one time, and the cycle was repeated three times. There were no cracks and damages in the inspection results.

Example Embodiment

[0049] Example 3

[0050] The proportion of silicon carbide powder in this example is shown in Table 1, and other preparation methods are the same as those in Example 1.

[0051] After testing, the apparent porosity of the honeycomb silicon carbide ceramic prepared in this example is 43%, and the porosity is 68%; the compressive strength in the axial direction is 42Mpa, and the compressive strength in the radial direction is 13Mpa; The temperature was raised to 650 ℃ / min, and after 30 minutes of heat preservation, it was taken out and cooled in the air to the greenhouse for one time, and the cycle was repeated three times. There were no cracks and damages in the inspection results.

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Abstract

The invention relates to a honeycomb-shaped silicon carbide ceramic carrier, and a preparation method and an application thereof. The preparation method comprises the following steps: mixing of raw materials: a step of mixing main materials and auxiliary materials so as to obtain a mixed material, wherein the main materials comprise a first silicon carbide powder material with a particle size of 50 to 65 [mu]m and a second silicon carbide powder material with a particle size of 10 to 40 [mu]m, and the auxiliary materials comprise a sintering auxiliary agent, an adhesive and a pore-forming agent; preparation of a green body; and sintering. The honeycomb-shaped silicon carbide ceramic carrier prepared by using the method provided by the invention can be applied to the fields of metallurgy, environmental protection, chemical industry, energy, biology, food and medicine. According to the invention, the use of two silicon carbide powder materials with different particle sizes increases the water content of a clay material and facilitates extrusion of the clay material, so a ceramic carrier with smooth surface is obtained; meanwhile, the ceramic carrier prepared by using the method provided by the invention has the advantages of high porosity, high strength and more applicability to practical application.

Description

technical field [0001] The invention relates to a honeycomb ceramic, in particular to a honeycomb silicon carbide ceramic carrier and its preparation method and application. Background technique [0002] Honeycomb ceramics is a kind of honeycomb industrial ceramics, inside of which are many through honeycomb parallel channels, because of its high strength, high temperature resistance, corrosion resistance, wear resistance and other excellent properties, it is widely used in regenerators, fillers, Filtration materials and catalyst carriers and other fields. [0003] When the honeycomb ceramic is used as a catalyst carrier, active components such as precious metals, rare earth metals or transition metals are usually directly loaded on the surface of the honeycomb ceramic carrier by the impregnation method, or a layer of unique coating material is first coated on the surface of the honeycomb ceramic carrier and then loaded Active components, prepared catalysts with correspondi...

Claims

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Application Information

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IPC IPC(8): C04B38/06C04B35/565B01J32/00B01J27/224
Inventor 吴彦霞梁海龙赵春林陈鑫黄瀚涛霍艳丽刘海林唐婕胡利明
Owner CHINA BUILDING MATERIALS ACAD
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