CN116021802A - Method for preparing heat-preserving barrel by short fiber mould pressing - Google Patents
Method for preparing heat-preserving barrel by short fiber mould pressing Download PDFInfo
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- CN116021802A CN116021802A CN202211631087.3A CN202211631087A CN116021802A CN 116021802 A CN116021802 A CN 116021802A CN 202211631087 A CN202211631087 A CN 202211631087A CN 116021802 A CN116021802 A CN 116021802A
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- 239000000835 fiber Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000003825 pressing Methods 0.000 title claims abstract description 13
- 239000000047 product Substances 0.000 claims abstract description 53
- 238000003763 carbonization Methods 0.000 claims abstract description 39
- 239000002994 raw material Substances 0.000 claims abstract description 34
- 239000011347 resin Substances 0.000 claims abstract description 30
- 229920005989 resin Polymers 0.000 claims abstract description 30
- 238000000465 moulding Methods 0.000 claims abstract description 18
- 238000000748 compression moulding Methods 0.000 claims abstract description 13
- 238000005470 impregnation Methods 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 11
- 238000003754 machining Methods 0.000 claims abstract description 8
- 238000000280 densification Methods 0.000 claims abstract description 7
- 238000011049 filling Methods 0.000 claims abstract description 6
- 239000012467 final product Substances 0.000 claims abstract description 6
- 239000007791 liquid phase Substances 0.000 claims abstract description 5
- 238000010000 carbonizing Methods 0.000 claims abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 23
- 238000001816 cooling Methods 0.000 claims description 13
- 239000011261 inert gas Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 238000002360 preparation method Methods 0.000 abstract description 4
- 229920000049 Carbon (fiber) Polymers 0.000 abstract description 3
- 239000004917 carbon fiber Substances 0.000 abstract description 3
- 238000005520 cutting process Methods 0.000 abstract description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 3
- 235000021190 leftovers Nutrition 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 description 8
- 239000000463 material Substances 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 230000008021 deposition Effects 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 238000009417 prefabrication Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention relates to the technical field of preparation of heat-insulating barrels, in particular to a method for preparing a heat-insulating barrel by molding short fibers. Step 1) preparing raw materials in proportion; step 2) uniformly mixing the raw materials; step 3) filling the uniformly mixed raw materials into a specific die, and performing compression molding; step 4) carbonizing the pressed and molded product at a high temperature for one time; step 5) carrying out liquid phase impregnation densification on the product after primary carbonization; step 6) carrying out secondary carbonization on the dipped and densified product; step 7) removing ash content of a secondary carbonized product through high-temperature treatment; and 8) machining to obtain a final product. The invention greatly shortens the manufacturing period of the heat-insulating barrel, adopts a short fiber and resin mixing method for short fiber mould pressing, and the short fiber raw material can be obtained by cutting and scattering carbon fiber leftovers, thereby greatly improving the utilization rate of the raw material; because the compression molding is adopted, the design of the appearance is higher, and when the appearance size of the product is changed, the pressed mold is modified.
Description
Technical Field
The invention relates to the technical field of preparation of heat-insulating barrels, in particular to a method for preparing a heat-insulating barrel by molding short fibers.
Background
High purity silicon is widely used in many fields of modern technology, the preparation temperature is high, and silicon vapor continuously corrodes related parts in the preparation process; the carbon/carbon composite material has the characteristics of low density, high heat capacity, excellent heat conductivity, strong thermal shock resistance, high specific modulus and the like, and the appearance of the carbon/carbon composite material has strong designability, so that the carbon/carbon composite material becomes a good choice of thermal field parts in the production process of manufacturing silicon, and provides novel thermal field design and material guarantee for processes of increasing the feeding amount, improving the pulling speed, reducing the energy consumption and the like of a single crystal drawing furnace; compared with the traditional graphite high-temperature material, the carbon/carbon composite material has higher strength, longer service life and simplified structure in the furnace.
Disclosure of Invention
The invention aims to provide a method for preparing a heat-preserving barrel by molding short fibers.
In order to solve the technical problems, the technical scheme of the invention is as follows: a method for preparing a heat-preserving barrel by molding short fibers comprises the following steps:
step 1) preparing raw materials in proportion;
step 2) uniformly mixing the raw materials;
step 3) filling the uniformly mixed raw materials into a specific die, and performing compression molding;
step 4) carbonizing the pressed and molded product at a high temperature for one time;
step 5) carrying out liquid phase impregnation densification on the product after primary carbonization;
step 6) carrying out secondary carbonization on the dipped and densified product;
step 7) removing ash content of a secondary carbonized product through high-temperature treatment;
and 8) machining to obtain a final product.
Preferably, the raw materials comprise short fibers with the length of 0.5 cm-4 cm, powdery resin and carbon powder.
Preferably, the raw materials are in a mass ratio, wherein the mass ratio of the fibers is 20-50%, the mass ratio of the resin powder is 40-50%, and the mass ratio of the carbon powder is 0-30%;
preferably, in the step 2), the raw materials are uniformly mixed, namely the weighed short fibers, the powdery resin and the carbon powder are added into a stirrer for mixing according to the mass ratio for a plurality of times, and after all the materials are put into the stirrer, stirring is continued for 1 to 2 hours to ensure uniform stirring.
Preferably, in the step 3), the uniformly mixed raw materials are filled into a specific mold, the pressing molding is to fill the uniformly stirred raw materials into the mold, the mold is pressurized by adopting a step pressurizing mode, the mold is heated in a step mode, the temperature reaches the target temperature, the temperature is kept for a certain time, and the mold is naturally cooled and opened.
Preferably, in the step 4), the high-temperature primary carbonization of the compression molding product is carried out by placing a compression molding heat-preserving barrel in a carbonization furnace, introducing inert gas, heating to 700-1000 ℃ by adopting a step heating mode, preserving heat for 3-5 hours, carrying out primary carbonization, and cooling and taking out along with the furnace.
Preferably, in the step 5), the liquid phase impregnation densification of the once carbonized product is performed by placing the once carbonized product into a resin impregnation furnace, pressurizing the resin liquid under 1-3 MPa after the resin liquid is used for the densification of the product.
Preferably, in the step 6), the secondary carbonization of the impregnated and densified product is that the heat-preserving barrel formed by pressing is placed in a carbonization furnace, inert gas is introduced, the temperature is raised to 700-1000 ℃ in a step heating mode, the heat is preserved for 3-5 hours for secondary carbonization, and the product is taken out after furnace cooling.
Preferably, in the step 7), the ash of the secondary carbonized product is removed by placing the product after the secondary carbonization in a high-temperature furnace and removing the ash of the product by adopting a step to raise the temperature to 1800-2100 ℃.
Compared with the prior art, the invention has the beneficial effects that:
1. the traditional method for manufacturing the heat-preserving barrel needs to carry out the steps of prefabrication body manufacturing, deposition, dipping, carbonization, high-temperature treatment, machining and the like, the time period is long, the deposition time can reach hundreds of hours, the manufacturing period of the prefabrication body is avoided, and the manufacturing period of the heat-preserving barrel is greatly shortened by adopting a short fiber mould pressing method.
2. The short fiber mould pressing adopts a short fiber and resin mixing method, and the short fiber raw material can be obtained by cutting and scattering carbon fiber leftover materials, so that the utilization rate of the raw material is greatly improved.
3. Because the compression molding is adopted, the design of the appearance is higher, and when the appearance size of the product is changed, the pressed mold is modified.
Detailed Description
The following describes the invention in more detail. The description of these embodiments is provided to assist understanding of the present invention, but is not intended to limit the present invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Example 1
A method for preparing a heat-preserving barrel by molding short fibers comprises the following steps: step 1) preparing according to the mass ratio of raw materials, wherein the mass ratio of fiber is 50%, the mass ratio of powdery resin is 50%, and the prepared raw materials are weighed without adding carbon powder;
step 2) adding the weighed short fibers and powdery resin into a stirrer for mixing according to the mass ratio for a plurality of times, and continuously stirring for 2 hours after all the short fibers and the powdery resin are put into the stirrer to ensure uniform stirring;
step 3) filling the uniformly stirred raw materials into a die, pressurizing the die by adopting a step pressurizing mode, heating the die by adopting a step mode, keeping the temperature for a certain time when reaching a target temperature, and naturally cooling and opening the die;
step 4) placing the compression molding heat-preserving barrel in a carbonization furnace, introducing inert gas, heating to 1000 ℃ in a step heating mode, preserving heat for 3 hours for primary carbonization, and cooling along with the furnace and taking out;
step 5) placing the product after primary carbonization into a resin impregnation furnace, wherein the resin liquid is used for immersing the product, and pressurizing the product under 3MPa to densify the product;
step 6) placing a heat-preserving barrel formed by pressing into a carbonization furnace, introducing inert gas, heating to 1000 ℃ in a step heating mode, preserving heat for 3 hours, performing secondary carbonization, and cooling along with the furnace and taking out;
step 7) placing the product after secondary carbonization in a high-temperature furnace, and removing ash of the product by adopting stepped heating to 1800 ℃;
and 8) machining to obtain a final product.
Example 2
A method for preparing a heat-preserving barrel by molding short fibers comprises the following steps: step 1) preparing according to the mass ratio of raw materials, wherein the mass ratio of fiber is 30%, the mass ratio of powdery resin is 50%, and the mass ratio of carbon powder is 20%, weighing the prepared raw materials;
step 2) adding the weighed short fibers, powdery resin and carbon powder into a stirrer for mixing according to mass ratio for multiple times, and continuing stirring for 1.5 hours after all the short fibers, the powdery resin and the carbon powder are put into the stirrer to ensure uniform stirring;
step 3) filling the uniformly stirred raw materials into a die, pressurizing the die in a step pressurizing mode, heating the die in a step heating mode, maintaining the temperature for a certain time when the temperature reaches a target temperature, and naturally cooling and opening the die;
step 4) placing the compression molding heat-preserving barrel in a carbonization furnace, introducing inert gas, heating to 800 ℃ in a step heating mode, preserving heat for 4 hours for primary carbonization, and cooling along with the furnace and taking out;
step 5) placing the product after primary carbonization into a resin impregnation furnace, wherein the resin liquid is used for immersing the product, and pressurizing the product under 2MPa to densify the product;
step 6) placing a heat-preserving barrel formed by pressing into a carbonization furnace, introducing inert gas, heating to 800 ℃ in a step heating mode, preserving heat for 4 hours, performing secondary carbonization, and cooling along with the furnace and taking out;
step 7), placing the product after secondary carbonization in a high-temperature furnace, and removing ash of the product by adopting stepped heating to 1900 ℃;
and 8) machining to obtain a final product.
Example 3
A method for preparing a heat-preserving barrel by molding short fibers comprises the following steps: step 1) preparing according to the mass ratio of raw materials, wherein the mass ratio of fiber is 20%, the mass ratio of powdery resin is 50%, and the mass ratio of carbon powder is 30%, weighing the prepared raw materials;
step 2) adding the weighed short fibers, powdery resin and carbon powder into a stirrer for mixing according to mass ratio for a plurality of times, and continuing stirring for 1h after all the short fibers, the powdery resin and the carbon powder are put into the stirrer to ensure uniform stirring;
step 3) filling the uniformly stirred raw materials into a die, pressurizing the die by adopting a step pressurizing mode, heating the die by adopting a step mode, keeping the temperature for a certain time when reaching a target temperature, and naturally cooling and opening the die;
step 4) placing the compression molding heat-preserving barrel in a carbonization furnace, introducing inert gas, heating to 700 ℃ in a step heating mode, preserving heat for 5 hours for primary carbonization, and cooling along with the furnace and taking out;
step 5) placing the product after primary carbonization into a resin impregnation furnace, wherein the resin liquid is used for immersing the product, and pressurizing the product under 1MPa to densify the product;
step 6) placing a heat-preserving barrel formed by pressing into a carbonization furnace, introducing inert gas, heating to 700 ℃ in a step heating mode, preserving heat for 5 hours, performing secondary carbonization, and cooling along with the furnace and taking out;
step 7) placing the product after secondary carbonization in a high-temperature furnace, and removing ash of the product by adopting a step to raise the temperature to 2100 ℃;
and 8) machining to obtain a final product.
Compared with the traditional method, the method for manufacturing the heat-preserving barrel by the short fiber mould pressing prepared in the embodiment 1-3 has the advantages that the time period is long and can reach hundreds of hours, the manufacturing period of the prefabricated body is avoided, and the manufacturing period of the heat-preserving barrel is greatly shortened by adopting the short fiber mould pressing method.
2. The short fiber molding adopts a short fiber, resin and carbon powder mixing method, the short fiber raw material can be obtained by cutting and scattering carbon fiber leftover materials, the carbon powder can be obtained by machining waste materials, and the utilization rate of the raw material is greatly improved.
3. Because the compression molding is adopted, the design of the appearance is higher, and when the appearance size of the product is changed, the pressed mold is modified.
The embodiments of the present invention have been described in detail above, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, and yet fall within the scope of the invention.
Claims (9)
1. The method for preparing the heat-preserving barrel by molding the short fibers is characterized by comprising the following steps of:
step 1) preparing raw materials in proportion;
step 2) uniformly mixing the raw materials;
step 3) filling the uniformly mixed raw materials into a specific die, and performing compression molding;
step 4) carbonizing the pressed and molded product at a high temperature for one time;
step 5) carrying out liquid phase impregnation densification on the product after primary carbonization;
step 6) carrying out secondary carbonization on the dipped and densified product;
step 7) removing ash content of a secondary carbonized product through high-temperature treatment;
and 8) machining to obtain a final product.
2. The method for preparing the heat-preserving barrel by molding the short fiber according to claim 1, wherein the method comprises the following steps: the raw materials comprise short fibers with the length of 0.5 cm-4 cm, resin powder and carbon powder.
3. The method for preparing the heat-preserving barrel by molding the short fiber according to claim 2, wherein the method comprises the following steps: the raw materials are in a mass ratio, wherein the mass ratio of the fiber is 20% -50%, the mass ratio of the resin powder is 40% -50%, and the mass ratio of the carbon powder is 0% -30%.
4. The method for preparing the heat-preserving barrel by molding the short fiber according to claim 1, wherein the method comprises the following steps: in the step 2), the raw materials are uniformly mixed, namely the weighed short fibers, the powdery resin and the carbon powder are added into a stirrer for mixing according to the mass ratio for a plurality of times, and the mixture is continuously stirred for 1 to 2 hours after being completely put into the stirrer, so that the uniform stirring is ensured.
5. The method for preparing the heat-preserving barrel by molding the short fiber according to claim 1, wherein the method comprises the following steps: in the step 3), the uniformly mixed raw materials are filled into a specific die, the pressing and forming is to fill the uniformly stirred raw materials into the die, the die is pressurized to a target pressure by adopting a step pressurizing mode, the die is heated to 140-200 ℃ by adopting a step mode, the temperature and the pressure are kept for 60-150 min, and the die is cooled and opened naturally.
6. The method for preparing the heat-preserving barrel by molding the short fiber according to claim 1, wherein the method comprises the following steps: in the step 4), the high-temperature primary carbonization of the compression molding product is carried out by placing a compression molding heat-preserving barrel in a carbonization furnace, introducing inert gas, adopting a step heating mode to heat to 700-1000 ℃ and preserving heat for 3-5 hours for primary carbonization, and cooling and taking out along with the furnace.
7. The method for preparing the heat-preserving barrel by molding the short fiber according to claim 1, wherein the method comprises the following steps: in the step 5), the liquid phase impregnation densification of the once carbonized product is carried out by putting the once carbonized product into a resin impregnation furnace, leading the resin liquid into the furnace until the resin liquid is over the product, and pressurizing the furnace to 1-3 MPa to densify the product.
8. The method for preparing the heat-preserving barrel by molding the short fiber according to claim 1, wherein the method comprises the following steps: in the step 6), the product after impregnation densification is subjected to secondary carbonization, namely the product after impregnation is placed in a carbonization furnace, inert gas is introduced, the temperature is raised to 700-1000 ℃ in a step heating mode, the temperature is kept for 3-5 hours for secondary carbonization, and the product is taken out after furnace cooling.
9. The method for preparing the heat-preserving barrel by molding the short fiber according to claim 1, wherein the method comprises the following steps: in the step 7), ash content of a secondary carbonized product is removed by high-temperature treatment, namely the product after secondary carbonization is placed in a high-temperature furnace, and the ash content of the product is removed by adopting stepped temperature rise to 1800-2100 ℃.
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| CN202211631087.3A CN116021802A (en) | 2022-12-19 | 2022-12-19 | Method for preparing heat-preserving barrel by short fiber mould pressing |
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| CN202211631087.3A CN116021802A (en) | 2022-12-19 | 2022-12-19 | Method for preparing heat-preserving barrel by short fiber mould pressing |
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Citations (6)
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|---|---|---|---|---|
| CN102531659A (en) * | 2011-11-09 | 2012-07-04 | 西安航天复合材料研究所 | Treatment method of carbon fiber ash for C/C (carbon/carbon) composite material |
| CN108101569A (en) * | 2018-01-24 | 2018-06-01 | 航天睿特碳材料有限公司 | A kind of preparation method of high temperature furnace used novel chopped fibre dimension insulation quilt cylinder |
| CN109404453A (en) * | 2018-12-30 | 2019-03-01 | 兴化市精密铸锻造产业研究院有限公司 | A kind of heavy-load automobile wear-resisting charcoal/charcoal brake block preparation method |
| CN110590390A (en) * | 2019-09-02 | 2019-12-20 | 大同新成新材料股份有限公司 | Carbon fiber graphite crucible for metallurgical casting furnace and preparation method thereof |
| CN113087540A (en) * | 2019-12-23 | 2021-07-09 | 袁瑶 | Method for preparing silicon nitride coating on surface of carbon fiber preform |
| CN113816757A (en) * | 2021-10-29 | 2021-12-21 | 西安美兰德新材料有限责任公司 | Method for quickly preparing carbon-carbon composite material heat-insulating barrel |
-
2022
- 2022-12-19 CN CN202211631087.3A patent/CN116021802A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102531659A (en) * | 2011-11-09 | 2012-07-04 | 西安航天复合材料研究所 | Treatment method of carbon fiber ash for C/C (carbon/carbon) composite material |
| CN108101569A (en) * | 2018-01-24 | 2018-06-01 | 航天睿特碳材料有限公司 | A kind of preparation method of high temperature furnace used novel chopped fibre dimension insulation quilt cylinder |
| CN109404453A (en) * | 2018-12-30 | 2019-03-01 | 兴化市精密铸锻造产业研究院有限公司 | A kind of heavy-load automobile wear-resisting charcoal/charcoal brake block preparation method |
| CN110590390A (en) * | 2019-09-02 | 2019-12-20 | 大同新成新材料股份有限公司 | Carbon fiber graphite crucible for metallurgical casting furnace and preparation method thereof |
| CN113087540A (en) * | 2019-12-23 | 2021-07-09 | 袁瑶 | Method for preparing silicon nitride coating on surface of carbon fiber preform |
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