CN115479470A

CN115479470A - Crucible with high thermal deformation performance and preparation process thereof

Info

Publication number: CN115479470A
Application number: CN202211131570.5A
Authority: CN
Inventors: 杨建明
Original assignee: Deqing Sanming Crucible Co ltd
Current assignee: Deqing Sanming Crucible Co ltd
Priority date: 2022-09-15
Filing date: 2022-09-15
Publication date: 2022-12-16

Abstract

The invention discloses a crucible with high thermal change performance and a preparation process thereof, and the crucible comprises a crucible main body, wherein a first bulge and a second bulge are integrally formed on the outer wall of the crucible main body, the upper surface of the first bulge is flush with the upper surface of the crucible main body, the second bulge is positioned below the first bulge, a plurality of arc-shaped salient points are integrally formed on one side of the first bulge opposite to the second bulge, and a notch is formed in the upper surface of the crucible main body; the crucible body is mainly a pot body made of aluminum oxide, silicon dioxide, ferric oxide, ball clay, calcined coke and kyanite fine powder serving as raw materials through a mould, and the aluminum oxide, the silicon dioxide and the ferric oxide serving as aggregate clinker, so that the high-temperature resistance of the crucible body can be effectively improved, the density and the mechanical strength of the crucible body are enhanced, the remarkable effect is achieved, and the probability of deformation of the crucible body during long-time high-temperature heating is reduced to a certain extent.

Description

Crucible with high thermal deformation performance and preparation process thereof

Technical Field

The invention belongs to the technical field of crucible preparation, and particularly relates to a crucible with high thermal change performance and a preparation process thereof.

Background

The crucible is a vessel or melting pot made of extremely refractory materials (such as clay, graphite, china clay, quartz or metal iron which is difficult to melt). The use method is that the crucible is a ceramic bowl-shaped container with a deep bottom. When solids are to be heated with a strong fire, a crucible must be used. As it is more tolerant of high temperatures than glassware. When the crucible is used, a crucible cover is usually placed on the crucible in an inclined manner to prevent the heated material from jumping out and to allow air to freely enter and exit for possible oxidation reactions. Because the bottom of the crucible is very small, the crucible can be directly heated by fire generally by being erected on a mud triangle.

Through search, the application numbers of the Chinese patent documents are as follows: 201710822379.8 discloses a crucible and a preparation method thereof, wherein the crucible comprises: a crucible body including a bottom wall and a side wall; a first coating layer provided on the bottom wall and the side wall for preventing diffusion of metallic impurities into the grains located in the crucible body; a second coating disposed over the first coating on the sidewall, the second coating for assisting in nucleation of grains located within the crucible body; and a third coating disposed on the bottom wall outside the first coating, the third coating being for assisting a crystal located within the crucible body to detach from the crucible body. The crucible disclosed by the invention can effectively reduce the diffusion of metal impurities in the crucible body to polycrystalline crystals in the crucible body, so that the prepared polycrystalline silicon is high in purity.

However, the invention still has the following defects:

the thermal change performance of this crucible is unsatisfactory, can appear deformation phenomenon when advancing high temperature heating for a long time to influenced the use of crucible, the crucible still does not have limit function in addition, gets the risk that the crucible can appear the landing when shifting at crucible tongs clamp, has certain potential safety hazard.

Disclosure of Invention

The invention aims to provide a crucible with high thermal change performance and a preparation process thereof, and aims to solve the problems of low working efficiency and large labor waste in the prior art in the background art.

In order to realize the purpose, the invention adopts the following technical scheme:

the utility model provides a crucible that thermal change performance is high, includes the crucible main part, the outer wall integrated into one piece of crucible main part has first arch and second arch, the upper surface parallel and level of first bellied upper surface and crucible main part, the second arch is located first bellied below, first protruding one side integrated into one piece relative with the second arch has a plurality of arc bump, the upper surface of crucible main part is provided with the breach, the one end of breach extends to first bellied lateral wall, the inner wall coating of crucible main part has the protective layer, the crucible main part mainly passes through the pot body that the mould was made for the raw materials by aluminium trioxide, silica, ferric oxide, ball clay, cooked coke and kyanite fine powder, the mould includes mould, well mould and lower mould, well mould is located between mould and the lower mould, just well mould and be provided with guiding mechanism between mould and the lower mould.

Preferably, the lower die is provided with a second die cavity for forming the crucible main body and the second protrusion, the upper side and the lower side of the middle die are respectively provided with a first die cavity for forming the convex points on the first protrusion and the second protrusion, and grooves corresponding to the convex points are formed in the first die cavity.

Preferably, the lower surface of the upper die is provided with a third die cavity for forming the first bulge, a first die pressing block and a second die pressing block are fixedly arranged in the third die cavity, the diameter of the first die pressing block corresponds to the inner diameter of the crucible main body, and the shape of the second die pressing block corresponds to the shape of the notch.

Preferably, the middle die comprises a left die and a right die which are arranged in a semicircular shape, one side of the left die is detachably connected with one side of the right die, and the left die and the right die form a complete circular ring.

Preferably, guiding mechanism includes a plurality of reference columns, the upper end outer wall integrated into one piece of lower mould has annular lug, just the upper surface of lug and the upper surface parallel and level of crucible main part are a plurality of the angles such as reference column are fixed around the lug upper surface, go up the mould and all offer the locating hole that supplies reference column one end to pass in the well.

Based on the crucible with high thermal change performance, the invention also provides a preparation process of the crucible with high thermal change performance, which comprises the following steps:

s1, preparing the following raw materials in parts by mass: 30-48 parts of aluminum oxide, 60-70 parts of silicon dioxide, 5-7 parts of ferric oxide, 20-30 parts of ball clay, 30-40 parts of calcined coke and 2-3 parts of kyanite fine powder;

s2, dry-mixing the raw materials in the step S1 by using a stirrer, and adding water for wet mixing after uniform mixing to obtain a muddy raw material;

s3, uniformly coating the mud-shaped raw materials into the lower die, so that the mud-shaped raw materials are coated on the side wall of a second die cavity of the lower die, then installing the middle die at the upper end of the lower die, and continuously coating the mud-shaped raw materials, so that the side wall of the second die cavity and the side wall of the first die cavity are coated with the mud-shaped raw materials;

s4, driving the upper die, the middle die and the lower die to be combined for die pressing by using a lifting mechanism, wherein the first die pressing block penetrates through the middle die and is positioned in the second die cavity, the second die pressing block is positioned in the second die cavity, and the excessive mud-shaped raw materials for die pressing enter the third die cavity to obtain a primary blank;

s5, drying and dehydrating the primary blank and the die together to remove water in the primary blank to obtain a hard blank body;

s6, demolding the hard blank from the mold, transferring the demolded hard blank to a firing kiln for firing and forming to obtain a blank;

and S7, coating protective layers on the surface and the inner part of the blank, and naturally drying to obtain a finished crucible product.

Preferably, in step S1, the following raw materials are prepared by mass: 30 parts of aluminum oxide, 60 parts of silicon dioxide, 5 parts of ferric oxide, 20 parts of ball clay, 30 parts of calcined coke and 2 parts of kyanite fine powder.

Preferably, in the step S6, when the hard blank is demolded, the upper die is separated from the middle die and the lower die, the middle die and the hard blank are taken out from the lower die, and finally the hard blank is separated from the middle die, and the demolded hard blank needs to be trimmed to remove burrs and projections and burr positions and then is fired.

Preferably, during firing, the hard blank is transferred into a firing kiln for firing, in the firing process, the temperature of the firing kiln is increased to 35 ℃ multiplying power every 8 hours for firing for 180 hours, the initial temperature of the firing kiln is 40 ℃, after firing, the firing kiln stops heating for 3H heat preservation, and after heat preservation is finished, the blank is taken out.

Preferably, the protective layer is set as an oxidation resistant paint in step S7, and the thickness of the protective layer is 0.1-0.2mm.

Compared with the prior art, the crucible with high thermal change performance and the preparation process thereof provided by the invention have the following advantages:

1. the crucible body is mainly a pot body made of the raw materials of aluminum oxide, silicon dioxide, ferric oxide, ball clay, calcined coke and kyanite fine powder through a mould, and the aluminum oxide, the silicon dioxide and the ferric oxide are used as aggregate clinker, so that the high-temperature resistance of the crucible body can be effectively improved, the density and the mechanical strength of the crucible body are obviously enhanced, and the probability of deformation of the crucible body during long-time high-temperature heating is reduced to a certain extent.

2. According to the crucible clamping device, the first protrusion and the second protrusion are arranged on the outer wall of the high crucible main body, so that the crucible can be clamped and taken in a limiting mode, the side, opposite to the first protrusion and the second protrusion, of the first protrusion is provided with the plurality of convex points, friction force between the crucible clamp and the first protrusion and between the crucible clamp and the second protrusion is increased, the probability that the crucible main body slides down is reduced, and the safety of using a crucible is improved to a certain extent.

Drawings

FIG. 1 is a schematic view of the crucible structure of the present invention;

FIG. 2 is a schematic cross-sectional view of a crucible of the present invention;

FIG. 3 is a schematic view of the mold structure of the present invention;

FIG. 4 is a schematic view of the exploded structure of the mold of the present invention;

FIG. 5 is a schematic view of the upper mold structure of the present invention;

fig. 6 is a schematic structural view of the middle mold assembly of the present invention.

In the figure: 1. a crucible main body; 2. a first protrusion; 3. a notch; 4. a second protrusion; 5. an upper die; 6. a middle mold; 601. a left die; 602. a right die; 7. a lower die; 8. a bump; 9. a positioning column; 10. a first mold cavity; 11. a first molding block; 12. a second molding block; 13. a third mold cavity; 14. a second mold cavity.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The specific embodiments described herein are merely illustrative of the invention and do not delimit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

The invention provides a crucible with high thermal change performance as shown in fig. 1-2, which comprises a crucible main body 1, wherein a first bulge 2 and a second bulge 4 are integrally formed on the outer wall of the crucible main body 1, the upper surface of the first bulge 2 is flush with the upper surface of the crucible main body 1, the second bulge 4 is positioned below the first bulge 2, a plurality of arc-shaped salient points are integrally formed on one side of the first bulge 2 opposite to the second bulge 4, a notch 3 is arranged on the upper surface of the crucible main body 1, one end of the notch 3 extends to the side wall of the first bulge 2, a protective layer is coated on the inner wall of the crucible main body 1, the crucible main body 1 mainly comprises a pot body which is made of aluminum oxide, silicon dioxide, ferric oxide, ball clay, calcined coke and kyanite fine powder which are used as raw materials through a mold, and the aluminum oxide, silicon dioxide and ferric oxide are used as aggregate clinker, so that the high-temperature resistance of the crucible main body can be effectively improved, the density and the mechanical strength of the crucible main body have obvious effects, and the probability of deformation of the crucible main body when the crucible is heated at high temperature is reduced to a certain extent.

As shown in fig. 3-6, the mold comprises an upper mold 5, a middle mold 6 and a lower mold 7, the middle mold 6 is located between the upper mold 5 and the lower mold 7, and a guide mechanism is arranged between the middle mold 6 and the upper mold 5 and the lower mold 7;

be provided with the second die cavity 14 that supplies crucible main part 1 and the protruding 4 shaping of second on the lower mould 7, the upper and lower both sides of well mould 6 are provided with the first die cavity 10 that supplies the first protruding 2 of confession and the protruding 4 upward salient point of second respectively, just the inside of first die cavity 10 is provided with the recess that corresponds with a plurality of bumps, and it is spacing when can getting the crucible forceps holder through the cooperation of first protruding 2 and the protruding 4 of second, and just one side that first protruding 2 is relative with the protruding 4 of second is provided with a plurality of bump, increases the frictional force between crucible forceps and first protruding 2 of first arch and the second arch 4 to landing probability appears in reducing crucible main part 1, has improved the security of crucible use to a certain extent.

Go up the lower surface of mould 5 and be provided with the third die cavity 13 that supplies first protruding 2 to take shape, the internal fixation of third die cavity 13 is fixed with first mould briquetting 11 and second mould briquetting 12, the diameter of first mould briquetting 11 corresponds with the internal diameter of crucible main part 1, the appearance of second mould briquetting 12 corresponds with the appearance of

breach

3, 3 relative bilateral symmetry in breach are provided with the inclined plane, the opposite side of breach 3 is the slope setting, breach 3 is the loudspeaker form in overlooking the cross-section, and when the crucible used, through 3 molten metal slopes to the hot melt in the crucible main part 1 of breach, it is unrestrained to reduce the molten metal.

Well mould 6 is including the left mould 601 and the right mould 602 that are the semicircular in shape setting, the connection can be dismantled with one side of right mould 602 to one side of left mould 601, left side mould 601 and right mould 602 constitute complete ring shape, and one side of left mould 601 is fixed with a plurality of projections, and the one end male jack of projection is seted up to one side of right mould 602, is convenient for be connected left mould 601 and right mould 602, and one side of left mould 601 inlays and is equipped with the sheetmetal, and the side of right mould 602 is inlayed and is equipped with the magnet piece, and the sheetmetal adsorbs with magnet piece magnetism, makes left mould 601 and right mould 602 for dismantling the setting, is convenient for deviate from crucible main body 1 from well mould 6 when the drawing of patterns.

Guiding mechanism includes a plurality of reference columns 9, the upper end outer wall integrated into one piece of lower mould 7 has annular lug 8, just the upper surface of lug 8 and the upper surface parallel and level of crucible main part 1 are a plurality of angles such as reference column 9 are fixed around lug 8 upper surface, go up and all set up the locating hole that supplies reference column 9 one end to pass on mould 5 and the well mould 6, through the cooperation of reference column 9 and locating hole, be convenient for well mould 6 with go up mould 5 respectively with 7 counterpoint compound dies of lower mould to improve the counterpoint precision of mould compound die.

the method comprises the following steps:

s1, preparing the following raw materials in parts by mass: 30 parts of aluminum oxide, 60 parts of silicon dioxide, 5 parts of ferric oxide, 20 parts of ball clay, 30 parts of calcined coke and 2 parts of kyanite fine powder;

s2, carrying out dry mixing on the raw materials in the step S1 by using a stirrer, and adding water for wet mixing after uniform mixing to obtain a muddy raw material;

s3, uniformly coating the mud-shaped raw materials into the lower die 7, so that the mud-shaped raw materials are coated on the side wall of a second die cavity 14 of the lower die 7, then installing the middle die 6 at the upper end of the lower die 7, and continuously coating the mud-shaped raw materials, so that the side wall of the second die cavity 14 and the side wall of the first die cavity 10 are coated with the mud-shaped raw materials;

s4, driving the upper die 5 to be combined with the middle die 6 and the lower die 7 by using a lifting mechanism for die pressing, wherein the first die pressing block 11 penetrates through the middle die 6 and is positioned inside the second die cavity 14, the second die pressing block 12 is positioned inside the second die cavity 14, and excessive mud-like raw materials are subjected to die pressing and enter the third die cavity 13 to obtain a primary blank;

s6, demolding the hard blank from the mold, transferring the demolded hard blank to a firing kiln for firing and forming to obtain a blank; when the hard blank is demoulded, the upper die 5 is separated from the middle die 6 and the lower die 7, the middle die 6 and the hard blank are taken out from the lower die 7, finally the hard blank is separated from the middle die 6, the demoulded hard blank needs to be trimmed, and the positions of bulges and burrs are scraped for firing;

and during firing, transferring the hard blank into a firing kiln for firing, wherein in the firing process, the temperature of the firing kiln is increased to 35 ℃ multiplying power every 8 hours for firing for 180 hours, the initial temperature of the firing kiln is 40 ℃, the firing kiln stops heating after firing is finished, heat preservation is carried out for 3H, and the blank is taken out after heat preservation is finished.

S7, coating protective layers on the surfaces and the inner parts of the blanks, and naturally drying to obtain a finished crucible product, wherein the protective layers are made of antioxidant coatings, and the coating thickness of the protective layers is 0.1-0.2mm.

Example 2

The same parts are not repeated, and different from the embodiment 1, S1 is prepared by the following raw materials by mass: 35 parts of aluminum oxide, 65 parts of silicon dioxide, 6 parts of ferric oxide, 25 parts of ball clay, 35 parts of calcined coke and 2.5 parts of kyanite fine powder.

Example 3

The same parts are not repeated, and different from the embodiment 1, S1 is prepared by the following raw materials by mass: 48 parts of aluminum oxide, 70 parts of silicon dioxide, 7 parts of ferric oxide, 30 parts of ball clay, 40 parts of calcined coke and 3 parts of kyanite fine powder.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims

1. A crucible that thermal change performance is high, includes crucible main body (1), its characterized in that: the outer wall integrated into one piece of crucible main part (1) has first arch (2) and protruding (4) of second, the upper surface parallel and level of first arch (2) and the upper surface of crucible main part (1), protruding (4) of second is located the below of first arch (2), one side integrated into one piece that first arch (2) and second arch (4) are relative has a plurality of arc bump, the upper surface of crucible main part (1) is provided with breach (3), the one end of breach (3) extends to the lateral wall of first arch (2), the inner wall coating of crucible main part (1) has the protective layer, crucible main part (1) mainly is the pot body of making through the mould by aluminium sesquioxide, silica, iron sesquioxide, ball clay, burnt and kyanite fine powder for the raw materials, the mould is including last mould (5), well mould (6) and lower mould (7), well mould (6) is located between last mould (5) and lower mould (7), just well mould (6) and last mould (5) and lower mould (7) are provided with guiding mechanism.

2. A high heat distortion crucible as set forth in claim 1, wherein: the lower die (7) is provided with a second die cavity (14) for forming the crucible main body (1) and the second protrusion (4), the upper side and the lower side of the middle die (6) are respectively provided with a first die cavity (10) for forming the convex points on the first protrusion (2) and the second protrusion (4), and the inside of the first die cavity (10) is provided with grooves corresponding to the convex points.

3. A high heat distortion crucible as set forth in claim 1, wherein: the crucible structure is characterized in that a third die cavity (13) for forming the first protrusion (2) is formed in the lower surface of the upper die (5), a first die pressing block (11) and a second die pressing block (12) are fixed in the third die cavity (13), the diameter of the first die pressing block (11) corresponds to the inner diameter of the crucible main body (1), and the appearance of the second die pressing block (12) corresponds to the appearance of the notch (3).

4. A crucible as set forth in claim 3 having high thermal change properties, wherein: the middle die (6) comprises a left die (601) and a right die (602) which are arranged in a semicircular shape, one side of the left die (601) is detachably connected with one side of the right die (602), and the left die (601) and the right die (602) form a complete circular ring shape.

5. A high heat distortion crucible as set forth in claim 1, wherein: guiding mechanism includes a plurality of reference columns (9), the upper end outer wall integrated into one piece of lower mould (7) has annular lug (8), just the upper surface of lug (8) and the upper surface parallel and level of crucible main part (1) are a plurality of reference column (9) wait the angle fix around lug (8) upper surface, go up mould (5) and well mould (6) and all set up the locating hole that supplies reference column (9) one end to pass.

6. A process for preparing a crucible having high thermal variability according to any one of claims 1 to 5, wherein: the method comprises the following steps:

s6, demolding the hard blank from the mold, and transferring the demolded hard blank into a firing kiln for firing and forming to obtain a blank;

7. The process for preparing a crucible having high thermal variability according to claim 6, wherein: in the step S1, the following raw materials are prepared according to the mass components: 30 parts of aluminum oxide, 60 parts of silicon dioxide, 5 parts of ferric oxide, 20 parts of ball clay, 30 parts of calcined coke and 2 parts of kyanite fine powder.

8. The process for preparing a crucible having high thermal variability according to claim 6, wherein: in the step S6, when the hard blank is demolded, the upper die (5) is separated from the middle die (6) and the lower die (7), then the middle die (6) and the hard blank are taken out from the lower die (7), finally the hard blank is separated from the middle die (6), the demolded hard blank needs to be trimmed, and the positions of bulges and burrs are scraped off and then fired.

9. The process of claim 8 for preparing a crucible having high thermal variability, wherein: and during firing, transferring the hard blank into a firing kiln for firing, wherein in the firing process, the temperature of the firing kiln is increased to 35 ℃ multiplying power every 8 hours for firing for 180 hours, the initial temperature of the firing kiln is 40 ℃, the firing kiln stops heating after firing is finished, heat preservation is carried out for 3H, and the blank is taken out after heat preservation is finished.

10. The process for preparing a crucible having high thermal variability according to claim 6, wherein: in the step S7, the protective layer is set to be antioxidant paint, and the thickness of the protective layer is 0.1-0.2mm.