Applied to pressureless sintering of silicon carbide high temperature crucible

Abstract

The utility model discloses a high-temperature crucible for atmospheric pressure sintering of silicon carbide, comprising: a crucible body, a transition arc is arranged at a right angle in the crucible body, a concave arc or a convex arc is arranged at the bottom of the crucible body, and a bottom arc is arranged at the connection between the concave arc or the convex arc and the side of the crucible body. Through the above structure, the strength of the internal corner of the component is enhanced to prevent the component from cracking at the internal corner after vacuum high-temperature sintering or in the use of the finished product. At the same time, the original yield rate of the high-temperature crucible of 30%-50% can be increased to more than 95%, and the yield rate of special-shaped products such as convex spherical surfaces and concave spherical surfaces placed in the high-temperature crucible can be greatly improved, and the production efficiency is greatly improved, providing a solid foundation for commercial mass production.

Description

Technical Field

[0001] The utility model relates to the technical field of a high-temperature crucible for sintering silicon carbide at normal pressure, in particular to a high-temperature crucible for sintering silicon carbide at normal pressure. Background Art

[0002] Atmospheric pressure sintered silicon carbide (hereinafter referred to as SSiC) is a non-metallic material with many excellent properties such as high strength, high hardness, high temperature resistance, corrosion resistance, wear resistance, etc. It is widely used in various fields of industrial production. The production process of SSiC parts requires vacuum high-temperature sintering and mechanical processing. These operation links will generate thermal stress and mechanical stress, and form stress concentration areas on the parts. If these stress areas are not properly handled, even high-strength and high-hardness SSiC parts are prone to cracking and scrapping during processing and use. The existing devices have not been optimized for this. For example, a Chinese patent discloses "a high-strength and high-temperature resistant silicon carbide crucible", and its application number is: "CN202222287018.7", which includes a bottom ring, a crucible body and a fork ring. Holes are opened on the upper front and rear sides of the crucible body. The crucible body is fixedly provided with a heat insulation layer around the crucible body. The heat insulation layer is provided with a cavity near the crucible body. The upper end surface of the heat insulation layer is provided with multiple heat dissipation holes at equal intervals. A cover is movably provided on the upper end of the body, a connecting block is fixedly provided on one side of the upper end surface of the cover, a temperature measuring rod is fixedly provided on the lower end of the connecting block and passes through the cover, a temperature transmission line is fixedly provided on the upper end surface of the connecting block, a metal connecting rod is fixedly provided on one side of the fork ring, and a handle is fixedly provided on the side of the metal connecting rod away from the fork ring. The above structure makes it easy to use, but when it is used, the thermal stress and mechanical stress generated during vacuum high-temperature sintering and mechanical processing are easily concentrated. These stress areas are not processed, which can easily cause the SSiC parts to crack and become scrapped during processing and use, and there are limitations in use. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art, and provides a high-temperature crucible for atmospheric sintering of silicon carbide, which is provided with a transition arc, a concave arc or a convex arc, and a bottom arc to enhance the strength of the internal corners of the component, prevent the component from cracking at the internal corners after vacuum high-temperature sintering or during the use of the finished product, and at the same time can increase the original yield rate of the high-temperature crucible from 30% to 50% to more than 95%, and can also greatly improve the yield rate of special-shaped products such as convex spherical surfaces and concave spherical surfaces placed in the high-temperature crucible, and greatly improve production efficiency, providing a solid foundation for commercial mass production.

[0004] The utility model also provides the above-mentioned high-temperature crucible for atmospheric pressure sintering of silicon carbide, comprising: a crucible body, a transition arc is arranged at a right angle in the crucible body, a concave arc or a convex arc is arranged at the bottom of the crucible body, and a bottom arc is arranged at the connection between the concave arc or the convex arc and the side of the crucible body. Through the above structure, the strength of the internal corners of the component is enhanced to prevent the component from cracking at the internal corners after vacuum high-temperature sintering or in the use of the finished product. At the same time, the original yield rate of the high-temperature crucible of 30%-50% can be increased to more than 95%, and the yield rate of special-shaped products such as convex spherical surfaces and concave spherical surfaces placed in the high-temperature crucible can be greatly improved, and the production efficiency is greatly improved, providing a solid foundation for commercial mass production.

[0005] According to the high-temperature crucible for atmospheric pressure sintering of silicon carbide, a special-shaped product having a concave spherical surface or a convex spherical surface matching the concave arc or the convex arc is placed on the concave arc or the convex arc. The above structure facilitates the placement of special-shaped products.

[0006] Beneficial Effects

[0007] Compared with the existing technology, this invention is applied to the atmospheric pressure sintered silicon carbide high-temperature crucible to enhance the strength of the internal corners of the components and prevent the components from cracking at the internal corners after vacuum high-temperature sintering or during the use of the finished product. At the same time, the original yield rate of the high-temperature crucible can be increased from 30%-50% to more than 95%, and the yield rate of special-shaped products such as convex spherical surfaces and concave spherical surfaces placed in the high-temperature crucible can be greatly improved, and the production efficiency can be greatly improved, providing a solid foundation for commercial mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0009] Figure 1 This is the overall structure diagram of the utility model applied to the atmospheric pressure sintered silicon carbide high temperature crucible;

[0010] Figure 2 This is a convex arc plane structure diagram of the utility model used for the atmospheric pressure sintering silicon carbide high temperature crucible;

[0011] Figure 3 This is a convex arc structure diagram of the utility model applied to the pressureless sintering silicon carbide high temperature crucible;

[0012] Figure 4 This is a concave arc structure diagram of the utility model applied to a pressureless sintered silicon carbide high temperature crucible;

[0013] Figure 5 The utility model is a concave arc plane structure diagram of a high-temperature crucible for sintering silicon carbide at atmospheric pressure.

[0014] Legend:

[0015] 1. Crucible body; 2. Transition arc; 3. Convex arc; 4. Bottom arc; 5. Concave arc. DETAILED DESCRIPTION

[0016] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0017] Reference Figure 1-5 The embodiment of the utility model is applied to a pressureless sintered silicon carbide high-temperature crucible, which includes: a crucible body 1, a transition arc 2 is arranged at a right angle inside the crucible body 1, which is convenient for reducing or eliminating thermal stress and mechanical stress, a concave arc 5 or a convex arc 3 is arranged at the bottom of the crucible body 1, which improves the yield of special-shaped products such as convex spherical surfaces and concave spherical surfaces placed in the high-temperature crucible, and a bottom arc 4 is arranged at the connection between the concave arc 5 or the convex arc 3 and the side of the crucible body 1 to reduce or eliminate thermal stress and mechanical stress.

[0018] A special-shaped product having a concave spherical surface or a convex spherical surface matching the concave arc 5 or the convex arc 3 is placed on the concave arc 5 or the convex arc 3, so as to facilitate the placement of the special-shaped product.

[0019] Working principle: When in use, put the heterosexual product matching the concave arc 5 or the convex arc 3 into the crucible body 1. During vacuum high-temperature sintering, the design of the transition arc 2 can reduce or even eliminate the thermal stress and mechanical stress at the right angles in the crucible body 1, avoiding cracking and scrapping of even high-strength and high-hardness SSiC parts during processing and use.

[0020] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. Applied to pressureless sintered silicon carbide high temperature crucible, characterized in that: include: A crucible body (1), wherein a transition arc (2) is arranged at a right angle inside the crucible body (1), a concave arc (5) or a convex arc (3) is arranged at the bottom of the crucible body (1), and a bottom arc (4) is arranged at the connection between the concave arc (5) or the convex arc (3) and the side of the crucible body (1).

2. The high temperature crucible for atmospheric pressure sintering of silicon carbide according to claim 1, characterized in that: A special-shaped product having a concave spherical surface or a convex spherical surface matching the concave arc (5) or the convex arc (3) is placed on the concave arc (5) or the convex arc (3).

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