CN219656615U

CN219656615U - Sintering boat for ceramic pipe

Info

Publication number: CN219656615U
Application number: CN202320981216.5U
Authority: CN
Inventors: 尹邦进; 伍习民
Original assignee: Zhejiang Jicheng New Material Co ltd
Current assignee: Zhejiang Jicheng New Material Co ltd
Priority date: 2023-04-24
Filing date: 2023-04-24
Publication date: 2023-09-08
Anticipated expiration: 2033-04-24

Abstract

The utility model belongs to the field of sintering, and particularly relates to a sintering boat for ceramic pipes, which comprises a boat body, wherein a placement hole is formed in the boat body, the section of the placement hole is formed by a section of major arc and a section of minor arc, the major arc diameter is larger than the minor arc diameter, the major arc center is positioned above the minor arc center, the major arc and the minor arc are opposite in direction, the major arc diameter is larger than the diameter of a ceramic green body pipe, the minor arc diameter is smaller than the diameter of the ceramic green body pipe and is larger than or equal to the diameter of a ceramic finished product pipe.

Description

Sintering boat for ceramic pipe

Technical Field

The utility model belongs to the field of sintering, and particularly relates to a sintering boat for ceramic pipes.

Background

Sintering is a process for preparing materials that are commonly used to manufacture high performance parts and tools. The sintering process mainly heats the powder material to a temperature below the melting point at high temperature to promote the combination among particles, so as to form a product with certain density and mechanical property.

Currently, many materials undergo shrinkage during sintering, a phenomenon also known as sintering shrinkage. This is because at high temperatures the molecular structure of the material changes and the atoms between the lattices rearrange, resulting in a reduction in the volume of the crystal. Some common materials such as silicon carbide, aluminum oxide, boron nitride, zirconium oxide, tungsten boride, titanium alloys, etc. exhibit shrinkage during sintering. Taking ceramic tube preparation as an example, when sintering ceramic tubes, a round hole matched with the ceramic tubes is generally arranged on a boat body on an existing sintering boat for bearing ceramic green tube containing holes, one part of the ceramic green tube is in surface contact with the containing holes, and the heating effect of the surface contact part is worse than that of a suspended part, so that the sintering uniformity is not facilitated.

Taking a kiln furniture for sintering ultra-long ceramic tubes as an example in Chinese patent 201920962051.0, a layered kiln furniture combined with a U-shaped placing groove is used for placing the silicon carbide tubes. There are several problems with such kiln furniture: the processing precision requirement is high, each layer of the kiln furniture is required to be aligned when being stacked, and when the processing precision of kiln furniture deviates, the processing errors in the height direction are accumulated after the multi-layer kiln furniture is stacked; when in use, kiln furniture is stacked layer by layer, and then a silicon carbide pipe is placed, so that time and labor are wasted; after slight deformation of kiln furniture occurs after multiple times of sintering use, the kiln furniture is easy to cause the misalignment during stacking, so that the placed ceramic green body pipe is in larger surface contact with the placing groove, and the quality of a sintered finished product is reduced.

Disclosure of Invention

The technical problem to be solved by the utility model is to provide a sintering boat for ceramic pipes, which utilizes the sintering shrinkage property of the ceramic pipes to ensure that the ceramic pipes are respectively in different better contact modes with the placing holes before and after sintering.

The utility model provides a sintering boat for ceramic pipes, which comprises a boat body, wherein a placement hole is formed in the boat body, the section of the placement hole consists of a major arc and a minor arc, the major arc diameter is larger than the minor arc diameter, the center of the major arc is positioned above the center of the minor arc, the major arc and the minor arc are opposite in arc direction, the major arc diameter is larger than the diameter of a ceramic green body pipe, the minor arc diameter is smaller than the diameter of the ceramic green body pipe, and the major arc diameter is larger than or equal to the diameter of a ceramic finished product pipe.

Still further, the major arc has a diameter 1.5-3mm greater than the outer diameter of the ceramic green tube and the minor arc has a diameter 0-0.4mm greater than the diameter of the ceramic finished tube.

Further, the distance d= (major arc diameter-minor arc diameter) x (0.7-0.8) between the major arc center and the minor arc center.

Further, a plurality of placing holes are formed, and the plurality of placing holes are distributed on the boat body in an array mode.

Further, the placement holes of two adjacent rows or two adjacent columns are staggered.

Further, the placement hole is a through hole.

Further, the boat body is provided with a plurality of boat bodies, and the placing holes on the plurality of boat bodies are aligned in the horizontal direction.

Furthermore, the boat body is made of graphite.

The utility model has the advantages that when the ceramic pipe is prepared, two pipe walls below the ceramic green pipe can be supported at the intersection of the major arc and the minor arc, at the moment, the two parts of the ceramic green pipe are in line contact with the placing holes, so that the contact area between the ceramic green pipe and the placing holes can be reduced, and meanwhile, gaps exist between the ceramic green pipe and the major arc and between the ceramic green pipe and the minor arc, so that the heating uniformity of the pipe wall of the ceramic green pipe can be improved, and the sintering efficiency and the sintering quality are improved.

Because the ceramic pipe material has the sintering shrinkage property, the ceramic green pipe has a certain proportion of shrinkage in the process of sintering into a ceramic finished pipe, when the ceramic finished pipe is obtained after sintering, the diameter of the ceramic finished pipe is reduced, the ceramic finished pipe falls into the part where the minor arc is located and contacts with the minor arc surface, so that the problem that the service life of the ceramic finished pipe is possibly influenced due to local stress concentration caused by larger point pressure generated by line contact in the cooling or storage process of the ceramic finished pipe is solved, and the storage effect of the ceramic finished pipe is improved.

According to the utility model, by means of structural design of the placement holes, by utilizing the sintering shrinkage property of the ceramic pipe, the ceramic pipe is in different better contact modes with the placement holes before and after sintering, and under the condition that a mechanical device is not needed to be used for moving the ceramic pipe, the sintering efficiency and quality of the ceramic green body pipe are improved, and the storage effect of the ceramic finished pipe is ensured.

In addition, the ceramic pipe is installed by arranging the placement holes on the boat body, compared with the existing kiln furniture adopting a multi-layer frame type, the boat body is of an integral structure, the stacking and the connection of the multi-layer frame body are not needed, the use is convenient, the processing precision and the installation requirements are low, and the deformation degree of the boat body after sintering is low.

Drawings

FIG. 1 is a schematic view of the structure of a single boat of the present utility model;

FIG. 2 is a schematic view of an assembled boat body;

FIG. 3 is a left side view of the FIG. 2 state;

FIG. 4 is an enlarged view of a portion of FIG. 3, showing a cross-sectional view of the placement hole;

FIG. 5 is an enlarged view of a portion of FIG. 3 at B, showing a schematic cross-sectional view of a ceramic green tube in a placement hole;

fig. 6 is an enlarged view of a portion C of fig. 3, showing a schematic cross-section of the finished ceramic tube in the placement hole.

In the figure, 1-boat; 2-placing holes; 21-major arc; 22-minor arc; 3-ceramic green tube; 4-ceramic finished tube.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; the device can be mechanically connected, electrically connected, physically connected or wirelessly connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical solutions of the embodiments of the present utility model may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present utility model.

It should be noted that the ceramic green tube 3 and the ceramic finished tube 4 described in the present utility model refer to different states of the ceramic tube, the ceramic green tube 3 refers to a state before sintering of the ceramic tube, and the ceramic finished tube 4 refers to a state after sintering of the ceramic tube. Wherein the ceramic pipe can be a solid rod or a hollow pipe, and the external section of the ceramic pipe can be round or oval.

As shown in fig. 1-6, the utility model provides a sintering boat for ceramic pipes, which comprises a boat body 1, wherein a placing hole 2 is arranged on the boat body 1, the placing hole 2 is used for placing a ceramic green pipe 3 to be sintered for sintering, and is also used for placing a ceramic finished pipe 4 after sintering;

the section of the placing hole 2 is composed of a section of major arc 21 and a section of minor arc 22, the two ends of the major arc 21 are connected with the two ends of the minor arc 22, the diameter of the major arc 21 is larger than that of the minor arc 22, the circle center of the major arc 21 is positioned above the circle center of the minor arc 22, the arcs of the major arc 21 and the minor arc 22 are opposite, the diameter of the major arc 21 is larger than that of the ceramic green tube 3, the diameter of the minor arc 22 is smaller than that of the ceramic green tube 3, and the diameter of the minor arc is larger than or equal to that of the ceramic finished tube 4.

The diameter of the major arc 21 is larger than that of the ceramic green tube 3, the diameter of the minor arc 22 is smaller than that of the ceramic green tube 3, so that when the ceramic green tube 3 is placed on the major arc 21 part of the placement hole 2, the ceramic green tube 3 is only contacted with the joint of the major arc 21 and the minor arc 22, and gaps are reserved between the ceramic green tube 3 and the wall surfaces of the major arc 21 and the minor arc 22, so that the heating uniformity of the ceramic green tube 3 during sintering is improved; the minor arc 22 diameter is larger than or equal to the ceramic finished tube 4 diameter, so that the ceramic finished tube 4 can be well contacted with the minor arc 22 surface. The specific dimensions of major arc 21 and minor arc 22 may be selected according to the size of the ceramic tube and the sintering shrinkage.

When the ceramic pipe is prepared, two pipe walls below the ceramic green pipe 3 are supported at the intersection of the major arc 21 and the minor arc 22, at the moment, the two parts of the ceramic green pipe 3 are in line contact with the placing holes 2, so that the contact area between the ceramic green pipe 3 and the placing holes 2 can be reduced, and meanwhile, gaps exist between the ceramic green pipe 3 and the major arc 21 and between the ceramic green pipe 3 and the minor arc 22, so that the heating uniformity of the pipe walls of the ceramic green pipe 3 can be improved, and the sintering efficiency and the sintering quality are improved.

Because the ceramic pipe material has the sintering shrinkage property, ceramic green ware pipe 3 has the shrink of certain proportion in the in-process of sintering into ceramic finished product pipe 4, when waiting to sinter ceramic finished product pipe 4, ceramic finished product pipe 4 falls into the part that inferior arc 22 is located to with inferior arc 22 face contact, so can be at ceramic finished product pipe 4 cooling or in-process of depositing, solve the line contact and can produce great point pressure, lead to local stress concentration, probably can influence the problem of ceramic finished product pipe's life, improve ceramic finished product pipe 4's storage effect.

According to the utility model, by means of structural design of the placement hole 2, by utilizing the sintering shrinkage property of the ceramic pipe, the ceramic pipe is in different better contact modes with the placement hole 2 before and after sintering, and under the condition that a mechanical device is not needed to be additionally utilized to move the ceramic pipe, the sintering efficiency and quality of the ceramic green body pipe 3 are improved, and the storage effect of the ceramic finished pipe 4 is ensured.

In addition, compared with the existing kiln furniture adopting a multi-layer frame, the ceramic tube is installed by arranging the placement holes 2 on the boat body 1, the boat body 1 is of an integral structure, the stacking and the connection of the multi-layer frame body are not needed, the use is convenient, the processing precision and the installation requirements are low, and the deformation degree of the boat body 1 after sintering is low.

In one embodiment, the diameter of the major arc 21 is 1.5-3mm larger than the outer diameter of the ceramic green tube 3, and the diameter of the minor arc 22 is 0-0.4mm larger than the diameter of the ceramic finished tube 4, so that the structure is compact, the space of the boat body 1 is reasonably utilized, and the space waste is avoided.

In one embodiment, the distance d= (major arc diameter-minor arc diameter) × (0.7-0.8) between the center of major arc 21 and the center of minor arc 22 provides a suitable drop distance when sintering ceramic green tube 3 into ceramic finished tube 4.

In one embodiment, the plurality of placing holes 2 are arranged, so that the utilization rate of the boat body 1 can be improved, one boat body 1 can simultaneously place a plurality of ceramic green body tubes 3 for sintering, the plurality of placing holes 2 are distributed on the boat body 1 in an array manner, the utilization rate of the structure of the boat body 1 can be improved, and more placing holes 2 are configured under the same size.

In a preferred embodiment, the placement holes 2 are shaped integrally, and the placement holes 2 in two adjacent rows or two adjacent columns are arranged in a staggered manner, so that the space of the boat body 1 can be utilized more reasonably, and the space waste is avoided.

In the utility model, the placing holes 2 can be blind holes arranged on the boat body 1, and in one preferred embodiment, the placing holes 2 are through holes, and the through holes can improve the air permeability of the placing holes 2, so that the ceramic green tubes 3 can be placed conveniently and the ceramic finished tubes 4 can be taken out conveniently.

In one embodiment, when the placement holes 2 are through holes, the boat body 1 is provided with a plurality of placement holes 2 on the boat bodies 1 in a horizontal direction aligned, in this embodiment, the boat bodies 1 can be assembled to adapt to sintering of ceramic tubes with different lengths, and compared with sintering of ceramic tubes with longer adaptation of the boat bodies 1 with large sizes in direct production and processing, the mode of assembling the boat bodies 1 can reduce the production difficulty and cost of the boat bodies 1, and the processing precision is slightly low.

The boat body 1 is made of graphite, the graphite has good high temperature resistance, corrosion resistance and mechanical strength and hardness, the requirements of a sintering process are well met, the graphite has good heat conductivity, heat can be quickly transferred, the heating speed and uniformity of the sintering boat are improved, and the sintering quality and efficiency are improved.

What is not described in detail in this specification is prior art known to those skilled in the art.

Claims

1. The utility model provides a sintering boat of ceramic tubular product, its characterized in that, includes boat body (1), be provided with on the boat body (1) and place hole (2), place hole (2) cross-section and constitute by one section major arc (21) and one section minor arc (22), major arc (21) diameter is greater than minor arc (22) diameter, major arc (21) centre of a circle is located minor arc (22) center of a circle top, major arc (21) with the arc of minor arc (22) is opposite, major arc (21) diameter is greater than the diameter of ceramic green body pipe (3), minor arc (22) diameter is less than ceramic green body pipe (3) diameter, and is greater than or equal to ceramic finished product pipe (4) diameter.

2. The sintering boat for ceramic pipe according to claim 1, characterized in that the major arc (21) has a diameter 1.5-3mm larger than the outer diameter of the ceramic green pipe (3), and the minor arc (22) has a diameter 0-0.4mm larger than the diameter of the ceramic finished pipe (4).

3. The ceramic tube sintering boat according to claim 1, wherein the distance d= (major arc diameter-minor arc diameter) x (0.7-0.8) between the center of the major arc (21) and the center of the minor arc (22).

4. The sintering boat for ceramic tubes according to claim 1, wherein a plurality of placing holes (2) are provided, and a plurality of placing holes (2) are distributed on the boat body (1) in an array.

5. The ceramic tube sintering boat according to claim 4, wherein the placement holes (2) of two adjacent rows or two adjacent columns are staggered.

6. The ceramic tube sintering boat according to any one of claims 1 to 5, wherein the placement holes (2) are through holes.

7. The sintering boat for ceramic pipe material according to claim 6, wherein a plurality of boat bodies (1) are provided, and the placing holes (2) on the boat bodies (1) are aligned in the horizontal direction.

8. The sintering boat for ceramic pipe material according to claim 6, wherein the boat body (1) is made of graphite.