CN1276260A - Cellular ceramics with low thermal expansibility - Google Patents
Cellular ceramics with low thermal expansibility Download PDFInfo
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- CN1276260A CN1276260A CN 99107837 CN99107837A CN1276260A CN 1276260 A CN1276260 A CN 1276260A CN 99107837 CN99107837 CN 99107837 CN 99107837 A CN99107837 A CN 99107837A CN 1276260 A CN1276260 A CN 1276260A
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- ceramic body
- raw material
- spodumene
- honeycomb ceramic
- particle size
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Abstract
A cellular ceramics with low thermal expansibility contains SiO2, Al2O3 and Li and is prepared through pretreatment of raw materials, controlling granularity, calcine and constant-temp treating. It can be used as the carrier of catalyst for purifying the exhaust gas of car. Its advantages are thermal expansibility lower than 1.2x10 to the power -6/deg.C at temp from ordinary temp to 900 deg.C, high strength, and high resistance to impact and acid corrosion.
Description
This patent belongs to the silicate engineering, special industry pottery preparation field.Be industrial tail gas, especially treating vehicle exhaust provides a kind of honeycomb ceramic carrier with premium properties.
Increase along with China's automobile pollution, the atmosphere pollution that vehicle exhaust causes is on the rise, cause air quality, the deterioration of the ecological environment, discharging for control and minimizing automobile exhaust pollution thing, the internal combustion engine expert starts with from improving combustion position, and chemist is started with from tail gas catalytic purification and done a large amount of experimental studies and exploitation.Honeycomb ceramic body is exactly a kind of monolithic devices carrier as cleaning catalyst for tail gases of automobiles, and its venting capability is good, resistance is little, is better than bead-type substrate.Catalyst carrier as vehicle exhaust also must have intensity good (anti-vibration), the characteristic of heat shock resistance (being that thermal coefficient of expansion is little).
From the seventies, abroad honeycomb ceramic body is just begun to develop, so far the cordierite honeycomb ceramic body that production performance is good in a large number.The insulator company of the representative producer such as the Corning Incorporated of the U.S., Japan.The thermal coefficient of expansion of the cordierite honeycomb ceramic body that they produce can reach 1.0 * 10
-6/ ℃.Domestic early eighties starting, existing a plurality of producers or company can produce the cordierite honeycomb ceramic body, but thermal coefficient of expansion is compared gap in addition with external product, be about 2.0 * 10
-6/ ℃.So far not seeing with the spodumene breeze through investigation is the report that raw material is made honeycomb ceramic body.The enforcement period of the ninth five-year plan, domestic to preparation ceramic honey comb soma tackling key problem, the index of its thermal coefficient of expansion is 1.35-1.5 * 10
-6/ ℃.This patent is a primary raw material with homemade spodumene breeze, has opened up the honeycomb ceramic body of β-spodumene structure.
This patent content is described in detail as follows:
1, raw material and prescription:
This honeycomb ceramic body is primary raw material (can account for 50%-70%) with the right fine ore of lithium brightness, requires to add the required amount of each main component according to prescription and regulates.Table 1 has provided composition of raw materials.
Table 1. is made the raw material of low thermal coefficient of expansion ceramic honey comb and is formed component title SiO
2Al
O3Li
2O MgO component content wt% 60-65 25-31 5.8-6.8 0.9-1.0
The limiting the quantity of of some impurity in the raw material: CaO＜0.2% Na
2O＜0.4% Fe
2O
3＜0.4%
2, raw material granularity requires:
Raw material need be crushed to certain particle size before refining mud, particle size range is calculated with cumulative volume 100%, and＜5 μ m account for 40%, and＜50 μ m account for 90%.
3, raw material gives processing
With the raw material each component by prescription requirements mixing after, satisfy above-mentioned 2 particle size range, mix, add hydraulic pressure and become piece (shape is random) through pulverizing, put into the high temperature furnace roasting.Sintering temperature 1300-1400 ℃.Constant temperature time 2-4 hour, need after the raw material cooling through giving roasting to reach above-mentioned 2 particle size range requirement through pulverizing again.
4, moulding
Through giving the raw material of processing, add the water of 5-6wt% binding agent (methylcellulose) and 25%, and take the circumstances into consideration to add micro-tung oil, refining mud, then extrusion modling.
5, firing temperature and constant temperature time
After the carrier extrusion modling, should dry immediately, then carry out roasting.Sintering temperature is 1100-1300 ℃ of constant temperature time 2-4 hour.Through a large amount of evidences, the main performance of the carrier that burns till under these conditions, as thermal coefficient of expansion in the maximum between the environment temperature to 900 ℃ less than 1.2 * 10
-6/ ℃.Intensity, water absorption rate does not have significant change.
Example 1
Raw materials used: spodumene fine ore, SiO
2Micro mist, Al
2O
3Micro mist and Li
2O, MgO (reagent)
Each constituent content of filling a prescription is: SiO
263%, Al
2O
328%, Li
2O6.4%, MgO 0.95%
Raw material after pulverizing, mix, give processing, moulding 1220 ℃ of roastings 3 hours.The honeycomb ceramic body that burns till is through performance measurement, and thermal coefficient of expansion is 1.16 * 10
-6/ ℃, with 10% salpeter solution boil after 0.5 hour system placed 24 hours again after, the molten water white transparency that is of liquid, intensity＞60kg/ (cm)
2, water absorption rate is 25%.
Claims (4)
1, a kind of catalyst β-spodumene honeycomb ceramic body that is used for industry, especially catalytic cleaning of car tail gas is characterized in that with the spodumene breeze be primary raw material, SiO
2, Al
2O
3, Li
2O is the main component of raw material, and raw material then is crushed to the certain particle size scope again through giving processing, and roasting at a certain temperature promptly becomes and has β-honeycomb ceramic body of spodumene structure after the moulding.
2, ceramic body according to claim 1 is characterized in that raw material based on spodumene breeze (can account for 50-70%), and the Main Ingredients and Appearance content of prescription is: SiO
260-65Wt% Al
2O
225-31wt% Li
2O 5.8-6.8Wt% MgO 0.9-1.0wt%.
3, ceramic body according to claim 1, it is characterized in that the raw material for preparing ceramic body need give processing, be that raw material is through being crushed to certain particle size (＜50 μ m account for 90V%), mix the back at 1300-1400 ℃ of roasting 2-4 hour, after being cooled to environment temperature, again it is ground into required particle size range, is the material of preparation honeycomb ceramic body.
4, ceramic body according to claim 1 is characterized in that sintering temperature is 1100-1300 ℃ after its moulding, and constant temperature time is 2-4 hour, and the honeycomb ceramic body that burns till is β-spodumene structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99107837 CN1233444C (en) | 1999-06-02 | 1999-06-02 | Cellular ceramics with low thermal expansibility |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99107837 CN1233444C (en) | 1999-06-02 | 1999-06-02 | Cellular ceramics with low thermal expansibility |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1276260A true CN1276260A (en) | 2000-12-13 |
| CN1233444C CN1233444C (en) | 2005-12-28 |
Family
ID=5272975
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99107837 Expired - Fee Related CN1233444C (en) | 1999-06-02 | 1999-06-02 | Cellular ceramics with low thermal expansibility |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1233444C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1293022C (en) * | 2005-03-02 | 2007-01-03 | 中国航空工业第一集团公司北京航空材料研究院 | Preparation method of honeycomb ceramic mud blank |
| CN101585003B (en) * | 2008-05-20 | 2011-12-14 | 揖斐电株式会社 | Honeycomb structure |
| CN102951907A (en) * | 2011-08-25 | 2013-03-06 | 康宁股份有限公司 | Control of fired shape by piece orientation |
| CN110639502A (en) * | 2019-09-26 | 2020-01-03 | 北京国电龙源环保工程有限公司 | SCR denitration catalyst with high thermal shock resistance for honeycomb ship and preparation method thereof |
-
1999
- 1999-06-02 CN CN 99107837 patent/CN1233444C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1293022C (en) * | 2005-03-02 | 2007-01-03 | 中国航空工业第一集团公司北京航空材料研究院 | Preparation method of honeycomb ceramic mud blank |
| CN101585003B (en) * | 2008-05-20 | 2011-12-14 | 揖斐电株式会社 | Honeycomb structure |
| CN102951907A (en) * | 2011-08-25 | 2013-03-06 | 康宁股份有限公司 | Control of fired shape by piece orientation |
| CN102951907B (en) * | 2011-08-25 | 2016-01-20 | 康宁股份有限公司 | Shape is burnt till by object tropism control |
| CN110639502A (en) * | 2019-09-26 | 2020-01-03 | 北京国电龙源环保工程有限公司 | SCR denitration catalyst with high thermal shock resistance for honeycomb ship and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1233444C (en) | 2005-12-28 |
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