Anti-bending, anti-sticking and wear-resistant graphite boat

Abstract

The utility model discloses an anti-bending, anti-sticking and wear-resistant graphite boat, which relates to the field of graphite boat structures, is used for sintering hard alloy bars and comprises a graphite boat body. The through groove is formed in the length direction of the graphite boat body in a penetrating manner; the multiple placement grooves are formed in the bottom wall of the through groove at equal intervals, the placement grooves are formed in the length direction of the bottom wall of the through groove in a penetrating mode, the cross section of each placement groove is in a circular arc shape, and hard alloy bars are arranged in the placement grooves; the vent holes penetrate through the graphite boat body and are connected with the placement groove, and the vent holes are formed in the length direction of the placement groove at equal intervals; the anti-bending, anti-sticking and wear-resistant graphite boat can solve the problems that hard alloy bars are easy to bend and stick in the sintering process and the graphite boat is worn too fast.

Description

Technical Field

[0001] The utility model relates to the field of graphite boat structures, in particular to a graphite boat that is anti-bending, anti-sticking, and wear-resistant. Background Art

[0002] During the sintering process, cemented carbide rods are heated to 1400°C to 1500°C in a vacuum furnace. To ensure sintering efficiency and product quality, graphite boats with excellent thermal conductivity are typically used to hold the rods. Furthermore, the graphite boats are coated with a high-temperature resistant coating to prevent the cobalt in the cemented carbide from reacting with the boat at high temperatures, potentially causing carburization and sticking to the boat.

[0003] Traditional graphite boat designs often utilize V-shaped grooves to support the rod, creating double-line contact between the two sides of the V-groove. However, during the sintering process of the cemented carbide rod, due to the shrinkage characteristics of the material, the rod's outer diameter and length will shrink by 20% to 30%. The sintering process is a process in which the carbide rod continuously shrinks, rubbing against the V-groove walls and sinking deeper into the groove.

[0004] During the sintering process, the two straight lines where the rod contacts the V-groove constantly shift position, sweeping out a trapezoidal surface on each side of the V-groove. The extensive friction on these two trapezoidal surfaces not only causes the rod to be blocked by external forces on both sides during contraction, creating a complex mechanical environment that can easily cause bending and deformation. This friction also damages the high-temperature resistant coating, leading to uneven carbon distribution on the rod's contact surface, further exacerbating the bending phenomenon.

[0005] Furthermore, as the rod material continues to penetrate the V-groove, it is prone to sticking and jamming. After repeated sintering and wear, the flatness of the trapezoidal surfaces on both sides of the V-groove deteriorates, resulting in dents. This not only further exacerbates the bending deformation of the rod material but also shortens the life of the graphite boat. When the dents become severe enough, the entire graphite boat becomes scrapped.

[0006] Furthermore, traditional graphite boats typically lack through-holes at the bottom of the trough plates, making it difficult for gas to circulate smoothly at the bottom of the rod. This results in uneven carbon distribution at the top and bottom of the rod. During the liquid phase sintering and cooling stages of the cemented carbide rod, this uneven carbon distribution causes different times for the rod to enter the liquid phase or crystallize, ultimately causing bending and deformation. Utility Model Content

[0007] The utility model aims to provide a bending-proof, sticking-proof and wear-resistant graphite boat, which can solve the problems of easy bending and sticking during the sintering process of cemented carbide rods and rapid wear of the graphite boat.

[0008] The above-mentioned optimized structure of the utility model is achieved through the following technical solutions: an anti-bending, anti-sticking and wear-resistant graphite boat for sintering cemented carbide rods, comprising a graphite boat body;

[0009] A through groove, the through groove being arranged along the length direction of the graphite boat body;

[0010] A plurality of placement grooves, wherein the plurality of placement grooves are arranged at equal intervals on the bottom wall of the through groove, the placement grooves are arranged through the length direction of the bottom wall of the through groove, the cross section of the placement grooves is arc-shaped, and the cemented carbide rods are arranged in the placement grooves;

[0011] A plurality of vent holes are provided, wherein the vent holes penetrate the graphite boat body and are connected to the placement groove. The plurality of vent holes are arranged at equal intervals along the length direction of the placement groove.

[0012] In some embodiments, the placement groove is arranged tangentially to the cemented carbide rod.

[0013] In some embodiments, the aperture of the placement slot is larger than the diameter of the cemented carbide rod.

[0014] In some embodiments, the graphite boat body includes a placement plate, and a plurality of placement slots are formed through the placement plate;

[0015] Two positioning blocks are symmetrically arranged on both sides of the placement plate, and the two positioning blocks and the placement plate form the through groove.

[0016] In some embodiments, the graphite boat body further includes two stacking grooves, which are symmetrically arranged at the bottom of the placement plate, and the stacking grooves are arranged to penetrate along the length direction of the placement plate.

[0017] In some embodiments, the positioning block is flush with a side surface of the placement plate away from a side surface of the placement groove.

[0018] In some embodiments, the cross-section of the stacking groove is L-shaped.

[0019] In some embodiments, the positioning block is plugged into and fits into the stacking slot.

[0020] In summary, the present invention has the following beneficial effects:

[0021] This anti-bending, anti-sticking and wear-resistant graphite boat ensures that the cemented carbide rod always maintains single-line contact with the boat during the sintering process by designing arc-shaped graphite grooves, avoiding the bending of the rod due to the influence of the external force of the traditional V-groove double-line contact when the rod shrinks, and the sticking of the rod due to the shrinkage into the deep V-groove, thereby reducing the wear on the boat and extending the service life of the boat. At the same time, air holes are evenly distributed at the bottom of the placement groove, so that gas can pass freely during the sintering process, ensuring the consistency of the carbon atmosphere at the top and bottom of the rod, avoiding the problem of rod bending caused by uneven carbon atmosphere, thereby improving the overall quality and stability of the sintered product. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the main view of the utility model;

[0023] Figure 2 It is a top sectional view of the utility model.

[0024] In the figure: 1. Graphite boat body; 11. Placement plate; 12. Positioning block; 13. Stacking groove; 2. Through groove; 3. Placement groove; 4. Vent hole. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] refer to Figure 1-2, a bending-proof, anti-sticking and wear-resistant graphite boat, used for sintering cemented carbide rods, including a graphite boat body 1; the graphite boat body 1 is provided with a through groove 2 along the length direction, which can provide a channel for air circulation and heat transfer; a plurality of placement grooves 3 are provided on the bottom wall of the through groove 2 at equal intervals, and the placement grooves 3 are arranged along the length direction of the bottom wall of the through groove 2. The cross-section of the placement groove 3 can be an arc shape, and a cemented carbide rod is arranged in the placement groove 3. The placement groove 3 is arranged tangentially to the cemented carbide rod so that the placement groove 3 and the cemented carbide rod are in single-line contact, which can reduce the friction between the cemented carbide and the groove wall and reduce the risk of adhesion; the aperture of the placement groove 3 is larger than the diameter of the cemented carbide rod, so that the cemented carbide rod can always be in contact with the normal line of the bottom of the arc surface of the placement groove 3 during sintering. Because the arc shape has a uniform curvature, the force acting on the round bar as it rolls along the arc is relatively stable and regular, always directed toward the center of the arc. This directivity makes the bar's movement during sintering shrinkage more stable and predictable, ensuring it always stays on the normal to the bottom of the arc, maintaining line contact. This relatively stable and uniform mechanical environment ensures that the bar will not bend due to external forces during contraction. Furthermore, single-line contact is maintained, minimizing damage to the coating and the slot plate. Consequently, wear and tear will not cause the bar to bend or the material to stick. This also ensures a long slot plate life, preventing grooves from extensive wear.

[0027] The graphite boat body 1 is penetrated by a plurality of ventilation holes 4, which are connected to the placement groove 3. The plurality of ventilation holes 4 are arranged at equal intervals along the length direction of the placement groove 3 to ensure uniform gas circulation during sintering, thereby ensuring the consistency of the carbon atmosphere at the top and bottom of the rod, avoiding bending caused by uneven carbon atmosphere at the top and bottom of the rod, and improving the sintering quality.

[0028] In some embodiments, the graphite boat body 1 includes a placement plate 11, two positioning blocks 12 and two stacking grooves 13. A plurality of placement grooves 3 are provided on the placement plate 11 for carrying carbide rods; the two positioning blocks 12 are symmetrically arranged on both sides of the placement plate 11, and the side of the positioning block 12 away from the placement groove 3 can be flush with the side of the placement plate 11, which can maintain the flatness of the two sides of the graphite boat body 1, and the two positioning blocks 12 and the placement plate 11 form a through groove 2, and the two stacking grooves 13 are symmetrically arranged at the bottom of the placement plate 11. The stacking groove 13 is set along the length direction of the placement plate 11, and the cross-section of the stacking groove 13 can be L-shaped. The positioning blocks 12 are plugged into the stacking grooves 13 to achieve stable placement of multiple layers of graphite boats when stacked up and down, avoid tilting or shaking, and save space.

[0029] The specific working principle is as follows:

[0030] When in use, the carbide rods are placed in the placement grooves 3 of the graphite boat body 1 respectively, and the stacking grooves 13 of the upper graphite boat are inserted into the positioning blocks 12 of the lower graphite boat to stack multiple graphite boats, and the stacked graphite boat layers are placed in a sintering furnace for sintering.

[0031] During the sintering process, the carbide rod will shrink. Since the normal line of the rod and the bottom of the arc surface of the placement groove 3 is always in single-line contact, the round rod will roll on the placement groove 3, and the direction of the force it is subjected to is always pointing to the center of the arc, so that the movement of the round rod during the sintering shrinkage process is stable, avoiding external force interference that causes the rod to bend during the rod shrinkage process. At the same time, it reduces damage to the coating and the groove plate, avoids rod bending and sticking to the boat due to wear of the graphite boat, and extends the service life of the graphite boat.

[0032] Furthermore, the vent holes 4 can ensure uniform gas flow during the sintering process, thereby ensuring consistency of the carbon atmosphere at the top and bottom of the rod, avoiding bending caused by uneven carbon atmosphere at the top and bottom of the rod, and improving the sintering quality.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A bending-proof, sticking-proof and wear-resistant graphite boat for sintering cemented carbide rods, characterized by: It includes a graphite boat body (1); A through groove (2), the through groove (2) being provided through the graphite boat body (1) in a length direction; A plurality of placement grooves (3), wherein the plurality of placement grooves (3) are arranged at equal intervals on the bottom wall of the through groove (2), the placement grooves (3) are arranged to penetrate along the length direction of the bottom wall of the through groove (2), the cross section of the placement grooves (3) is arc-shaped, and the carbide rod is arranged in the placement grooves (3); A plurality of vent holes (4) are provided, wherein the vent holes (4) penetrate the graphite boat body (1) and are connected to the placement groove (3), and the plurality of vent holes (4) are arranged at equal intervals along the length direction of the placement groove (3).

2. The anti-bending, anti-sticking, and wear-resistant graphite boat according to claim 1, characterized in that: The placement groove (3) is arranged tangentially to the hard alloy rod.

3. The anti-bending, anti-sticking, and wear-resistant graphite boat according to claim 2, characterized in that: The aperture of the placement groove (3) is larger than the diameter of the cemented carbide rod.

4. The anti-bending, anti-sticking, and wear-resistant graphite boat according to claim 1, characterized in that: The graphite boat body (1) comprises a placement plate (11), and a plurality of placement grooves (3) are provided through the placement plate (11); Two positioning blocks (12), the two positioning blocks (12) are symmetrically arranged on both sides of the placement plate (11), and the two positioning blocks (12) and the placement plate (11) form the through groove (2).

5. The anti-bending, anti-sticking, and wear-resistant graphite boat according to claim 4, characterized in that: The graphite boat body (1) further comprises two stacking grooves (13), the two stacking grooves (13) being symmetrically arranged at the bottom of the placement plate (11), and the stacking grooves (13) being arranged to penetrate along the length direction of the placement plate (11).

6. The anti-bending, anti-sticking, and wear-resistant graphite boat according to claim 4, characterized in that: The side of the positioning block (12) away from the placement groove (3) is flush with the side of the placement plate (11).

7. The anti-bending, anti-sticking, and wear-resistant graphite boat according to claim 5, characterized in that: The cross section of the stacking groove (13) is L-shaped.

8. The anti-bending, anti-sticking, and wear-resistant graphite boat according to claim 5, characterized in that: The positioning block (12) is plug-fitted into the stacking groove (13).

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