CN116021802A - Method for preparing heat-preserving barrel by short fiber mould pressing - Google Patents

Abstract

To France The present invention relates to the technical field of insulation bucket preparation, in particular to a method for preparing insulation bucket by short fiber molding. Step 1) Prepare the raw materials in proportion; Step 2) Mix the raw materials evenly; Step 3) Fill the uniformly mixed raw materials into a specific mold and press them; Step 4) Carry out high-temperature primary carbonization of the pressed molded products; Step 5) Carbonize the primary The final product is subjected to liquid-phase impregnation and densification; step 6) secondary carbonization of the product after impregnation and densification; step 7) high temperature treatment to remove the ash content of the secondary carbonization product; step 8) machine addition to obtain the final product. The invention greatly shortens the production cycle of the heat preservation bucket, and the short fiber molding adopts the method of mixing short fiber and resin, and the short fiber raw material can be obtained by cutting and breaking up the carbon fiber leftover material, which greatly improves the utilization rate of the raw material; Compression molding can have higher shape designability. When the product size changes, it is only necessary to modify the pressed mold.

Description

A kind of short fiber molding method for preparing insulation bucket

technical field

The invention relates to the technical field of preparation of heat preservation barrels, in particular to a method for preparing heat preservation barrels by molding short fibers.

Background technique

High-purity silicon is widely used in many fields of modern technology. Its preparation temperature is relatively high, and silicon vapor continuously corrodes related parts during the production process; carbon/carbon composite materials have low density, high heat capacity and thermal conductivity Excellent, strong thermal shock resistance, high specific modulus, etc., and the shape of the carbon/carbon composite material itself has strong designability, and has become a good choice for the production of thermal field parts in the silicon production process. Feed rate, increased casting speed, reduced energy consumption and other processes provide new thermal field design and material guarantee; compared with traditional graphite high-temperature materials, carbon/carbon composite materials have higher strength, longer service life, and the structure of the furnace has also been improved. simplification.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for preparing a thermal insulation barrel by molding short fibers.

In order to solve the above-mentioned technical problems, the technical solution of the present invention is: a method for preparing a thermal insulation barrel by molding short fibers, comprising the following steps:

Step 1) prepare raw materials in proportion;

Step 2) uniformly mixing the raw materials;

Step 3) Filling the uniformly mixed raw materials into a specific mold, and pressing to form;

Step 4) Carrying out high-temperature primary carbonization of the pressed molded product;

Step 5) performing liquid-phase impregnation and densification on the product after primary carbonization;

Step 6) secondary carbonization of the impregnated and densified product;

Step 7) high temperature treatment to remove the secondary carbonization product ash;

Step 8) machining to obtain the final product.

Preferably, the raw material includes short fibers with a length of 0.5cm-4cm, powdery resin and carbon powder.

Preferably, the ratio of the raw materials is a mass ratio, wherein the fiber mass ratio is 20-50%, the resin powder mass ratio is 40-50%, and the carbon powder mass ratio is 0-30%;

Preferably, in said step 2), uniformly mixing the raw materials is to add short fibers, powdered resin and carbon powder into the mixer according to the mass ratio for mixing, and after putting them all into the mixer, continue to stir 1 to 2 hours to ensure uniform stirring.

Preferably, in the step 3), the uniformly mixed raw materials are loaded into a specific mold, and the press molding is to load the uniformly stirred raw materials into the mold, pressurize the mold by step pressing, and carry out the stepwise process on the mold. Raise the temperature, reach the target temperature and keep it warm for a certain period of time, then cool down naturally and open the mold.

Preferably, in the step 4), the high-temperature primary carbonization of the pressed-formed product is to place the pressed-formed heat preservation barrel in the carbonization furnace, and adopt a stepwise heating method to raise the temperature to 700-1000° C. under the introduction of inert gas and keep it warm for 3-30°C. Carry out carbonization once in 5 hours, and take it out with the furnace cooling.

Preferably, in the step 5), the liquid-phase impregnation and densification of the primary carbonized product is to put the primary carbonized product into a resin impregnation furnace, the resin liquid is immersed in the product, and the product is pressurized under 1 to 3 MPa. densification.

Preferably, in said step 6), the secondary carbonization of the impregnated and densified product is to place the pressed heat preservation barrel in the carbonization furnace, and pass it under an inert gas Use a stepwise heating method to raise the temperature to 700-1000°C and keep it warm for 3-5 hours for secondary carbonization, and take it out with the furnace cooling.

Preferably, in the step 7), the high-temperature treatment to remove the ash of the secondary carbonized product is to place the secondary carbonized product in a high-temperature furnace, and use steps to raise the temperature to 1800° C. to 2100° C. to remove the ash of the product.

Compared with prior art, the beneficial effect of the present invention is:

1. The traditional method of making an insulated bucket requires several steps such as prefabricated body production, deposition, impregnation, carbonization, high temperature treatment, and machining. The time period is long, and the deposition can reach hundreds of hours, and the prefabricated body The production cycle of the insulation barrel is greatly shortened by the short fiber molding method.

2. Short fiber molding adopts the method of mixing short fiber and resin, and the raw material of short fiber can be obtained by cutting and breaking up carbon fiber leftovers, which greatly improves the utilization rate of raw materials.

3. Due to the use of compression molding, it can have a higher designability of the shape. When the shape and size of the product change, it is only necessary to modify the pressed mold.

Detailed ways

Specific embodiments of the present invention will be further described below. It should be noted here that the descriptions of these embodiments are used to help understand the present invention, but are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not constitute a conflict with each other.

Example 1

A method for preparing a thermal insulation bucket by short fiber molding, comprising the following steps: Step 1) preparing according to the mass ratio of raw materials, wherein the mass ratio of fiber is 50%, and the mass ratio of powdery resin is 50%, without adding carbon powder, weighing Prepare raw materials;

Step 2) adding the weighed short fiber and powdery resin to the agitator several times according to the mass ratio for mixing, after putting them all into the agitator, continue to stir for 2 hours to ensure uniform stirring;

Step 3) Fill the evenly stirred raw materials into the mold, pressurize the mold by step pressure, and heat up the mold by step method, reach the target temperature and keep it warm for a certain period of time, and open the mold by natural cooling;

Step 4) Place the press-molded heat preservation barrel in the carbonization furnace, raise the temperature to 1000°C by step heating method under the introduction of inert gas and keep it warm for 3 hours for a carbonization, and take it out with the furnace cooling;

Step 5) put the product after the primary carbonization into the resin impregnation furnace, the resin liquid has submerged the product, and pressurize the product under 3MPa to densify;

Step 6) The secondary carbonization of the impregnated and densified product is to place the pressed and formed insulation barrel in the carbonization furnace, and use the stepwise heating method to raise the temperature to 1000°C under the inert gas and keep it for 3 hours for secondary carbonization, and then cool with the furnace take out;

Step 7) Place the product after secondary carbonization in a high-temperature furnace, and use steps to raise the temperature to 1800°C to remove the ash content of the product;

Step 8) machining to obtain the final product.

Example 2

A method for preparing a thermal insulation barrel by molding short fibers, comprising 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% Weigh the prepared raw materials;

Step 2) adding the weighed short fiber, powdery resin and carbon powder to the mixer several times according to the mass ratio for mixing, after putting them all into the mixer, continue to stir for 1.5 hours to ensure uniform stirring;

Step 3) Fill the evenly stirred raw materials into the mold, pressurize the mold by step pressurization, heat up the mold by step heating, reach the target temperature and keep it warm for a certain period of time, and open the mold by natural cooling;

Step 4) Place the press-molded heat preservation barrel in the carbonization furnace, raise the temperature to 800 ° C by step heating method under the introduction of inert gas and keep it warm for 4 hours to carry out carbonization once, and take it out with the furnace cooling;

Step 5) put the product after the primary carbonization into a resin impregnation furnace, the resin liquid has submerged the product, and pressurized at 2MPa to densify the product;

Step 6) The secondary carbonization of the impregnated and densified product is to place the pressed and formed heat preservation barrel in the carbonization furnace, and use a stepwise heating method to raise the temperature to 800°C under the inert gas and keep it for 4 hours for secondary carbonization, and then cool with the furnace take out;

Step 7) Place the product after secondary carbonization in a high-temperature furnace, and use steps to raise the temperature to 1900°C to remove the ash content of the product;

Step 8) machining to obtain the final product.

Example 3

A method for preparing a thermal insulation barrel by molding short fibers, comprising 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% Weigh the prepared raw materials;

Step 2) adding the weighed short fiber, powdery resin and carbon powder to the mixer for multiple times according to the mass ratio for mixing, after putting them all into the mixer, continue stirring for 1 hour to ensure uniform mixing;

Step 3) Fill the evenly stirred raw materials into the mold, pressurize the mold by step pressure, and heat up the mold by step method, reach the target temperature and keep it warm for a certain period of time, and open the mold by natural cooling;

Step 4) Place the press-molded heat preservation barrel in the carbonization furnace, raise the temperature to 700°C by step heating method under the introduction of inert gas and keep it warm for 5 hours to carry out carbonization once, and take it out with the furnace cooling;

Step 5) put the product after the primary carbonization into the resin impregnation furnace, the resin liquid has submerged the product, and pressurize the product under 1MPa to densify;

Step 6) The secondary carbonization of the impregnated and densified product is to place the pressed heat preservation bucket in the carbonization furnace, and use a stepwise heating method to raise the temperature to 700°C under the inert gas and keep it warm for 5 hours for secondary carbonization, and then cool with the furnace take out;

Step 7) Place the product after secondary carbonization in a high-temperature furnace, and use steps to raise the temperature to 2100°C to remove the ash content of the product;

Step 8) machining to obtain the final product.

Compared with the traditional method, compared with the traditional method, the method of preparing the thermal insulation barrel by molding the short fibers obtained in the above examples 1-3 needs to go through several steps such as prefabricated body production, deposition, impregnation, carbonization, high temperature treatment, and machining. Steps, the time period is long, up to hundreds of hours during deposition, and the production cycle of the prefabricated body is also eliminated. The short fiber molding method greatly shortens the production cycle of the insulation barrel.

2. Short fiber molding adopts the mixing method of short fiber, resin and carbon powder. The raw material of short fiber can be obtained by cutting and breaking up carbon fiber scraps, and the carbon powder can be obtained from machining waste, which greatly improves the utilization rate of raw materials.

3. Due to the use of compression molding, it can have a higher designability of the shape. When the shape and size of the product change, it is only necessary to modify the pressed mold.

The embodiments of the present invention have been described in detail above, but the present invention is not limited to the described embodiments. For those skilled in the art, without departing from the principle and spirit of the present invention, various changes, modifications, substitutions and modifications to these embodiments still fall within the protection scope of the present invention.

Claims (9)

1. a kind of method that short fiber molding prepares insulation barrel, it is characterized in that, may further comprise the steps: Step 1) prepare raw materials in proportion; Step 2) uniformly mixing the raw materials; Step 3) Filling the uniformly mixed raw materials into a specific mold, and pressing to form; Step 4) Carrying out high-temperature primary carbonization of the pressed molded product; Step 5) performing liquid-phase impregnation and densification on the product after primary carbonization; Step 6) secondary carbonization of the impregnated and densified product; Step 7) high temperature treatment to remove the secondary carbonization product ash; Step 8) machining to obtain the final product. 2 . The method for preparing an insulated bucket by short fiber molding according to claim 1 , wherein the raw materials include short fibers with a length of 0.5 cm to 4 cm, resin powder and carbon powder. 3. The method for preparing an insulated barrel by short fiber molding according to claim 2, characterized in that: the ratio of the raw materials is a mass ratio, wherein the mass ratio of the fiber is 20% to 50%, and the mass ratio of the resin powder is 40%. % to 50%, and the mass ratio of carbon powder is 0% to 30%. 4. the method for preparing thermal insulation bucket by short fiber molding according to claim 1, is characterized in that: in described step 2), uniformly mixing raw materials is to take by weighing short fiber, powdery resin and carbon powder by mass ratio Add it to the mixer several times for mixing. After putting everything into the mixer, continue stirring for 1-2 hours to ensure uniform mixing. 5. The method for preparing an insulated bucket by short fiber molding according to claim 1, characterized in that: in said step 3), the uniformly mixed raw material is loaded into a specific mold, and the compression molding is to fill the uniformly stirred raw material Enter the mold, pressurize the mold to the target pressure by step pressure, the target pressure is 4MPa ~ 10MPa, use the step method to raise the temperature of the mold, the temperature is raised to 140℃ ~ 200℃, and the temperature is kept for 60 ~ 150min, and the natural cooling is started. mold. 6. The method for preparing a thermos by short fiber molding according to claim 1, characterized in that: in said step 4), carrying out high-temperature primary carbonization of the compacted product is placing the compacted thermos in a carbonization furnace, Under the passage of inert gas, the temperature is raised to 700-1000°C by stepwise heating method, and the temperature is kept for 3-5 hours for primary carbonization, and it is taken out with the furnace cooling. 7. The method for preparing an insulated bucket by short fiber molding according to claim 1, characterized in that: in said step 5), the liquid-phase immersion densification of the product after the primary carbonization is to put the product after the primary carbonization into the resin In the impregnation furnace, the resin liquid is immersed in the product, and the inert gas is passed into the furnace to pressurize to 1-3MPa to densify the product. 8. The method for preparing a thermos tank by short fiber molding according to claim 1, characterized in that: in said step 6), the secondary carbonization of the product after impregnation and densification is to place the product after impregnation and densification on In the carbonization furnace, the temperature is raised to 700-1000°C in a stepwise manner under the introduction of inert gas, and the temperature is kept for 3-5 hours for secondary carbonization, and it is taken out with the furnace cooling. 9. The method for preparing an insulated bucket by short fiber molding according to claim 1, characterized in that: in said step 7), the high-temperature treatment to remove the ash content of the secondary carbonized product is to place the secondary carbonized product in a high-temperature furnace , use stepwise heating to 1800 ℃ ~ 2100 ℃ to remove product ash.