CN103044032A - Manufacturing method of silicon carbide carbon smoke filter resistant to high temperature - Google Patents
Manufacturing method of silicon carbide carbon smoke filter resistant to high temperature Download PDFInfo
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- CN103044032A CN103044032A CN2013100240157A CN201310024015A CN103044032A CN 103044032 A CN103044032 A CN 103044032A CN 2013100240157 A CN2013100240157 A CN 2013100240157A CN 201310024015 A CN201310024015 A CN 201310024015A CN 103044032 A CN103044032 A CN 103044032A
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Abstract
The invention discloses a manufacturing method of silicon carbide carbon smoke filter resistant to high temperature. Silicon carbide with the average grain diameter of 20-30 microns is used as a main raw material, and soapstone with the average grain diameter smaller than 10 microns, kaolin with the average grain diameter smaller than 2 microns and silicon micropowder with the average grain diameter smaller than 5 microns are used as sintering aids, so that the sintering temperature of the silicon carbide is reduced, a cordierite crystal phase is formed and the high-temperature thermal shock performance of a pure silicon carbide product is improved; and a silicon carbide cuboid with the side length not shorter than 50*50mm is used as a matrix to splice and process into the silicon carbide carbon smoke filter so as to meet preparation requirements of the high-temperature-resistant silicon carbide carbon smoke filter at low cost and greatly reduce the production cost of the silicon carbide carbon smoke filter resistant to high temperature.
Description
Technical field
The present invention relates to diesel engine vent gas soot filters technical field, relate in particular to a kind of manufacture method of high-temperature resistant silicon carbide soot filters.
Background technology
Along with the attention of people to environment protection, more and more stricter emission of diesel engine rules will be formulated and implement.Because the potentiality of emission controls by improving combustion technology are limited, the further reduction that discharge has must be by the employing of external purification technology.Along with the development of automotive industry, the diesel emission post-processing technology is reformed continuous acquisition of technology, constantly improves.The emission standard of Europe more than 5 needs mounting diesel engine carbon soot particles trap (DPF), because the incomplete combustion of diesel-fuel in the engine, give off various types of diesel particulations (PM), its composition is carbon, inorganic oxide and hydrocarbon polymer, comprise some poisonous polycyclic aromatic hydrocarbonss (PAHs), HUMAN HEALTH is worked the mischief, and DPF can be imitated and be caught these particles, reduces and pollutes.Diesel particulate filter (DPF) device needs the regeneration system rapidly of an acquisition equipment and acquisition equipment, and particle can block acquisition equipment and cause the increase of back pressure, the hot state that produces when strainer must bear regeneration in addition.Because the oxidation heat liberation of ash, local temperature raises after the igniting, the thermal properties (specific heat capacity and thermal conductivity) that depends on filter material, also relevant with free air delivery and exhaust temperature, the worst situation is that the ash that all gathers is lighted rear engine and stopped, and strainer local 1000 ℃ or higher temperature will produce.That generally uses in the market is cordierite carbon soot particles trap, the main problem of materials of Jin green stone strainer is low heat conductivity, the low-down fusing point of material, cause the hot spot point under unfavorable reproduction condition, another problem of Jin green stone material it was reported it is that resistance to fouling to the grey component of compounds containing sodium is limited.In recent years, the SiC material is owing to excellent heat-resisting, corrosion-resistant and heat conductivility has obtained to develop rapidly as a kind of novel Diesel exhaust particles extracts filtering material, and the gap structure of SiC has better adjustability, can prepare high porosity more and the filtering material that distributes of uniform pore size more.High porosity, the advantage of heat-flash diffusibility, can make the temperature field in the strainer distribute more even, when identical carbon deposition quantity regeneration, the maximum temperature of filter interior is far below trichroite, can guarantee good regeneration safety performance, but the SiC material faces some problems, larger such as thermal expansivity, under high temperature thermal shocking, ftracture easily, and at high temperature SiC may be activated oxidation, produces hickie etc., the continuous effort that process relevant enterprise and researcher carry out aspect SiC material sintering process and structure design, these problems are resolved just increasingly, mainly be to adopt recrystallized silicon carbide, silico-carbo SiClx bi-material, but this bi-material sintering temperature is high, and firing atmosphere is strict, production cost is high, is unfavorable for the demand of the growing rate in market.
Summary of the invention
The present invention seeks to the deficiency for the prior art existence, a kind of cheaply manufacture method of resistant to elevated temperatures silicon carbide soot strainer is provided.
For achieving the above object, the manufacture method of the resistant to elevated temperatures silicon carbide soot of the present invention strainer can adopt following scheme: a kind of manufacture method of resistant to elevated temperatures silicon carbide soot strainer, and this preparation method may further comprise the steps:
(1) preparing 70 ~ 95 weight parts and median size is that silicon carbide, 13 ~ 18 weight parts and the median size of 20 μ m-30 μ m are less than the talcum of 10 μ m; 0 ~ 10 weight part and median size are less than kaolin, 0 ~ 5 weight part and the median size of the 2 μ m silicon powder less than 5 μ m;
(2) first above-mentioned silicon carbide, talcum, kaolin, silicon powder are mixed into powder mixture, add again pore-forming material, binding agent, lubricant, water and mediate and plastify into pug, again mix; Powder mixture 100 weight parts in this pug, pore-forming material 10 ~ 25 weight parts, binding agent 3 ~ 6 weight parts, lubricant 0.5 ~ 2 weight part, water 20 ~ 30 weight parts;
(3) above-mentioned pug is become the pane green compact by extrusion moulding;
(4) with above-mentioned pane green compact drying by 1430 ~ 1450 ℃ of high-temperature calcinations, be incubated and form the rectangular base substrate of sintered silicon carbon after 6 ~ 10 hours, the ceramic fiber of preparation 10 ~ 25 weight parts, the colloided silica of 15 ~ 20 weight parts, the water of 10 ~ 20 weight parts are mixed into the splicing agent, the rectangular base substrate of several sintered silicon carbons of 100 weight parts is formed ceramic honey comb with splicing agent bonding, and sintering obtains silicon carbide carbon smoke particle trap.
For problems of the prior art, preparation method of the present invention is by using median size 20 μ m ~ 30 μ m silicon carbide to be main raw material, to make product have resistant to elevated temperatures characteristic.And use median size less than the talcum of 10 μ m, median size is less than the kaolin of 2 μ m, median size less than the silicon powder of 5 μ m as sintering aid, these sintering aids have reduced the firing temperature of silicon carbide, and formation trichroite crystalline phase, improve the high temperature thermal shocking performance of pure silicon carbide products, thereby make the silicon carbide of lower cost namely can reach the preparation requirement of resistant to elevated temperatures silicon carbide soot strainer, greatly reduce the production cost of resistant to elevated temperatures silicon carbide soot strainer.
Description of drawings
Fig. 1 is the schematic perspective view of the silicon carbide soot strainer for preparing of the present invention.
Fig. 2 is the cross sectional representation of the silicon carbide soot strainer for preparing of the present invention.
Embodiment
Below in conjunction with the drawings and the specific embodiments, further illustrate the present invention, should understand following embodiment only is used for explanation the present invention and is not used in and limits the scope of the invention, after having read the present invention, those skilled in the art all fall within the application's claims limited range to the modification of the various equivalent form of values of the present invention.
See also Figure 1 and Figure 2, the present invention discloses a kind of manufacture method of resistant to elevated temperatures silicon carbide soot strainer 1, and this preparation method may further comprise the steps:
(1) preparing 70 ~ 95 weight parts and median size is that silicon carbide, 13 ~ 18 weight parts and the median size of 20 μ m-30 μ m are less than the talcum of 10 μ m; 0 ~ 10 weight part and median size are less than kaolin, 0 ~ 5 weight part and the median size of the 2 μ m silicon powder less than 5 μ m.
(2) first above-mentioned silicon carbide, talcum, kaolin, silicon powder are mixed into powder mixture, add again pore-forming material, binding agent, lubricant, water and mediate and plastify into pug, again mix; Powder mixture 100 weight parts in this pug, pore-forming material 10 ~ 25 weight parts, binding agent 3 ~ 6 weight parts, lubricant 0.5 ~ 2 weight part, water 20 ~ 30 weight parts; Wherein pore-forming material is preferably graphite and/or potato powder.
(3) above-mentioned pug is become the pane green compact by extrusion moulding, the pane green compact length of side is not less than 50mm.
(4) with above-mentioned pane green compact drying by 1430 ~ 1450 ℃ of high-temperature calcinations, be incubated and form the rectangular base substrate 2 of sintered silicon carbon after 6 ~ 10 hours, the water of the ceramic fiber of preparation 10 ~ 25 weight parts, the colloided silica of 15 ~ 20 weight parts, 10 ~ 20 weight parts is mixed into splicing agent 3, the rectangular base substrate of several sintered silicon carbons of 100 weight parts 2 and splicing agent 3 bondings are formed ceramic honey combs (shown in Figure 2), through less than 1000 ℃ the temperature sintering obtain silicon carbide soot strainer.
Example of the present invention:
Example 1, example 2, example 3 are to adjust the experiment that different ratios carries out in the same materials situation:
Example 4, example 5, example 6 are experiments that the raw material of different-grain diameter carries out in same ratio:
Bonding pug example:
No. 1 bonding pug: 100 parts of base substrate pugs, 10 parts of ceramic fibers, contain 15 parts, 20 parts water of colloided silica of atmosphere SiClx 40%
No. 1 bonding pug: 100 parts of base substrate pugs, 15 parts of ceramic fibers, contain 20 parts, 10 parts water of colloided silica of atmosphere SiClx 40%
Example 1, example 2, No. 1 bonding of example 3 usefulness pug are spliced into the product of desired size, and example 4, example 5, No. 2 bondings of example 6 usefulness pug are spliced into the product of desired size.
Embodiment processing parameter and experimental result:
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | |
| Splicing base substrate size (㎜) | 50 | 50 | 50 | 50 | 50 | 50 |
| The base substrate firing temperature (℃) | 1450 | 1450 | 1450 | 1450 | 1450 | 1450 |
| The base substrate soaking time (hour) | 8 | 8 | 8 | 8 | 8 | 8 |
| Splicing product firing temperature (℃) | 950 | 950 | 950 | 950 | 950 | 950 |
| Maximum operation (service) temperature (℃) | 1500 | 1480 | 1450 | 1460 | 1470 | 1490 |
| Thermal shock resistance properties (room temperature-1000 ℃ three circulations) | Intact | Intact | Intact | Intact | Intact | Intact |
The preparation of the diesel engine carbon black strainer of the high temperature resistant silicon carbide material that good thermal shock resistance properties arranged of seeing the present invention has realized producing in batches from above experimental result, thus improve the work-ing life of diesel engine carbon black strainer and reduced the production cost of silicon carbide soot strainer.
In sum, the manufacture method of the resistant to elevated temperatures silicon carbide soot of the present invention strainer has following beneficial effect:
1, use median size 20 μ m ~ 30 μ m silicon carbide to be main raw material, to make product have resistant to elevated temperatures characteristic.
2, use median size less than the talcum of 10 μ m, median size is less than the kaolin of 2 μ m, median size less than the silicon powder of 5 μ m as sintering aid, these sintering aids have reduced the firing temperature to 1430 of silicon carbide ~ 1450 ℃, and formation trichroite crystalline phase, improve the high temperature thermal shocking performance of pure silicon carbide products, because 1430 ~ 1450 ℃ namely can reach the firing temperature condition, so that the firing condition of present method obtains easily, greatly reduce the production cost of resistant to elevated temperatures silicon carbide soot strainer.
3, binding material is to add 10 ~ 15 weight part ceramic fibers in the base substrate waste material to become the pasty state material with water with 15 ~ 20 weight part colloided silicas, keeps the consistent of high temperature thermal shocking performance in taking full advantage of production in the waste material, further reduces production costs.
4, product is combined by the pane that the length of side is not less than 50mm, can greatly enhance productivity.
5, silicon carbide soot filters of the present invention has use temperature greater than 1300 ℃ of resistant to elevated temperatures performances.
Claims (3)
1. the manufacture method of a resistant to elevated temperatures silicon carbide soot strainer, it is characterized in that: this preparation method may further comprise the steps:
(1) preparing 70 ~ 95 weight parts and median size is that silicon carbide, 13 ~ 18 weight parts and the median size of 20 μ m-30 μ m are less than the talcum of 10 μ m; 0 ~ 10 weight part and median size are less than kaolin, 0 ~ 5 weight part and the median size of the 2 μ m silicon powder less than 5 μ m;
(2) first above-mentioned silicon carbide, talcum, kaolin, silicon powder are mixed into powder mixture, add again pore-forming material, binding agent, lubricant, water and mediate and plastify into pug, again mix; Powder mixture 100 weight parts in this pug, pore-forming material 10 ~ 25 weight parts, binding agent 3 ~ 6 weight parts, lubricant 0.5 ~ 2 weight part, water 20 ~ 30 weight parts;
(3) above-mentioned pug is become the pane green compact by extrusion moulding;
(4) with above-mentioned pane green compact drying by 1430 ~ 1450 ℃ of high-temperature calcinations, be incubated and form the rectangular base substrate of sintered silicon carbon after 6 ~ 10 hours, the ceramic fiber of preparation 10 ~ 25 weight parts, the colloided silica of 15 ~ 20 weight parts, the water of 10 ~ 20 weight parts are mixed into the splicing agent, the rectangular base substrate of several sintered silicon carbons of 100 weight parts and splicing agent bonding are formed ceramic honey comb, and with less than 1000 ℃ the temperature sintering obtain silicon carbide carbon smoke particle trap.
2. the manufacture method of resistant to elevated temperatures silicon carbide soot strainer according to claim 1, it is characterized in that: the pane green compact length of side is not less than 50mm.
3. the manufacture method of resistant to elevated temperatures silicon carbide soot strainer according to claim 2, it is characterized in that: described pore-forming material is preferably graphite and/or potato powder.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103387377A (en) * | 2013-07-17 | 2013-11-13 | 彭红 | Splicing mud for splice of very large ceramic honeycomb carrier |
| CN103539442A (en) * | 2013-09-23 | 2014-01-29 | 宜兴王子制陶有限公司 | Preparation method of ceramic catalyst carrier |
| CN104876624A (en) * | 2015-05-22 | 2015-09-02 | 宁夏机械研究院股份有限公司 | Silicon carbide honeycomb ceramic pug and pugging method |
| CN104909797A (en) * | 2015-05-22 | 2015-09-16 | 宁夏机械研究院股份有限公司 | Silicon carbide honeycomb ceramic pug, and production process and cutting device thereof |
| CN105503232A (en) * | 2015-12-01 | 2016-04-20 | 南京柯瑞特种陶瓷股份有限公司 | Preparation of wall-flow SiC honeycomb ceramic filter |
| CN106365677A (en) * | 2016-08-26 | 2017-02-01 | 宜兴王子制陶有限公司 | Main material for wall-flow type ceramic filter |
| CN106747558A (en) * | 2016-11-30 | 2017-05-31 | 奉新县绿康水质净化科技有限公司 | A kind of micro porous filtration purification stone and preparation method thereof |
| CN107573077A (en) * | 2017-10-18 | 2018-01-12 | 重庆奥福精细陶瓷有限公司 | Recrystallized silicon carbide diesel vehicle soot grain catcher and preparation method thereof |
| CN108178621A (en) * | 2018-01-26 | 2018-06-19 | 广西超盛网络科技有限责任公司 | A kind of high temperature ceramic material and preparation method thereof |
| CN108675823A (en) * | 2018-04-20 | 2018-10-19 | 安徽中都环宇新材料科技有限公司 | A kind of diesel emission particulate purification DPF honeycomb ceramic carriers |
| CN109944662A (en) * | 2019-03-25 | 2019-06-28 | 山东国瓷功能材料股份有限公司 | Honeycomb structure and honeycomb filter |
| CN114249605A (en) * | 2021-03-12 | 2022-03-29 | 宜兴王子制陶有限公司 | Silicon carbide particle catcher with silicon dioxide protective film and preparation method thereof |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103387377A (en) * | 2013-07-17 | 2013-11-13 | 彭红 | Splicing mud for splice of very large ceramic honeycomb carrier |
| CN103539442A (en) * | 2013-09-23 | 2014-01-29 | 宜兴王子制陶有限公司 | Preparation method of ceramic catalyst carrier |
| CN104876624A (en) * | 2015-05-22 | 2015-09-02 | 宁夏机械研究院股份有限公司 | Silicon carbide honeycomb ceramic pug and pugging method |
| CN104909797A (en) * | 2015-05-22 | 2015-09-16 | 宁夏机械研究院股份有限公司 | Silicon carbide honeycomb ceramic pug, and production process and cutting device thereof |
| CN105503232A (en) * | 2015-12-01 | 2016-04-20 | 南京柯瑞特种陶瓷股份有限公司 | Preparation of wall-flow SiC honeycomb ceramic filter |
| CN106365677A (en) * | 2016-08-26 | 2017-02-01 | 宜兴王子制陶有限公司 | Main material for wall-flow type ceramic filter |
| CN106747558A (en) * | 2016-11-30 | 2017-05-31 | 奉新县绿康水质净化科技有限公司 | A kind of micro porous filtration purification stone and preparation method thereof |
| CN107573077A (en) * | 2017-10-18 | 2018-01-12 | 重庆奥福精细陶瓷有限公司 | Recrystallized silicon carbide diesel vehicle soot grain catcher and preparation method thereof |
| CN108178621A (en) * | 2018-01-26 | 2018-06-19 | 广西超盛网络科技有限责任公司 | A kind of high temperature ceramic material and preparation method thereof |
| CN108675823A (en) * | 2018-04-20 | 2018-10-19 | 安徽中都环宇新材料科技有限公司 | A kind of diesel emission particulate purification DPF honeycomb ceramic carriers |
| CN109944662A (en) * | 2019-03-25 | 2019-06-28 | 山东国瓷功能材料股份有限公司 | Honeycomb structure and honeycomb filter |
| CN114249605A (en) * | 2021-03-12 | 2022-03-29 | 宜兴王子制陶有限公司 | Silicon carbide particle catcher with silicon dioxide protective film and preparation method thereof |
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Application publication date: 20130417 |