CN215902725U - Hot-pressing sintering die capable of achieving bidirectional pressing - Google Patents
Hot-pressing sintering die capable of achieving bidirectional pressing Download PDFInfo
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- CN215902725U CN215902725U CN202122473651.0U CN202122473651U CN215902725U CN 215902725 U CN215902725 U CN 215902725U CN 202122473651 U CN202122473651 U CN 202122473651U CN 215902725 U CN215902725 U CN 215902725U
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Abstract
A hot-pressing sintering die for bidirectional pressing relates to the field of hot-pressing sintering of ceramics and refractory metals. A ceramic cold pressing piece is arranged between the multiple layers of graphite backing plates; a graphite upper pressure head is arranged above the top-layer graphite backing plate; the graphite upper pressure head, the graphite backing plate and the ceramic cold pressing piece form a cylindrical structure and are arranged on the lug boss on the graphite base, and the inner wall of the graphite inserting plate is matched with the outer edge of the cylindrical structure formed by the graphite upper pressure head, the graphite backing plate and the ceramic cold pressing piece; the graphite inserting plate is hung on the graphite upper pressure head, the graphite lining is sleeved outside the graphite inserting plate, and the carbon-carbon composite outer sleeve is sleeved outside the graphite lining; gaps are reserved between the graphite inserting plate, the graphite lining, the bottom of the carbon-carbon composite outer sleeve and the upper surface of the graphite base. The utility model overcomes the problems that the thickness and the density of the final sintering blank present obvious gradient distribution, the bottom layer sintering blank is easy to have large thickness, low density and the like due to pressure transmission loss caused by unidirectional pressing in the hot-pressing sintering process of the existing common mould.
Description
Technical Field
The utility model relates to the field of hot-pressing sintering of ceramics and refractory metals, in particular to a two-way pressed hot-pressing sintering mold for ceramics and refractory metals.
Background
Hot press sintering refers to a process of heating a loose powder or a powder compact placed in a sintering mold of a defined shape while applying a certain external force to accelerate flow, rearrangement and densification. The hot-pressing sintering temperature is about 100-150 ℃ lower than that of normal-pressure sintering, but the hot-pressing sintering driving force is 20-100 times larger than that of normal-pressure sintering. The hot-pressing sintering is widely applied to the characteristic that special ceramic materials such as boron carbide, titanium boride and boron nitride and refractory metal materials such as tungsten and molybdenum are extremely difficult to sinter and compact. In the hot-pressing sintering process, the pressure causes the material migration such as powder particle rearrangement and plastic flow, grain boundary movement, strain induced twin crystal, creep deformation, and combination of volume diffusion and recrystallization in the later stage, and finally promotes the densification of the ceramic and refractory metal materials.
During the assembly and hot-press sintering process of the common hot-press sintering mold, the graphite inserting plate, the graphite lining and the carbon-carbon composite jacket (namely, the carbon/carbon composite material has low density: (<2.0g/cm3) High specific strength, high specific modulus, high thermal conductivity, low expansion coefficient, good thermal shock resistance, high dimensional stability and the like, and is the only alternative material applied at 1650 ℃ above at present). The multilayer graphite backing plate and the ceramic cold pressing piece inside the die are stressed in a unidirectional way in the hot-pressing sintering process. Because of the influence of the friction force in the die cavity, the pressure is gradually lost and reduced in the conduction process, so that the thickness and the density of the final sintering blank are obviously distributed in a gradient manner, and the phenomena of larger thickness and lower density are easily caused in the bottom layer sintering blank, thereby reducing the product quality and the production efficiency.
SUMMERY OF THE UTILITY MODEL
The utility model provides a hot-pressing sintering die for bidirectional pressing, which overcomes the problems that the thickness and the density of a final sintering blank are obviously distributed in a gradient manner, the thickness of a bottom sintering blank is easy to be larger, the density is easy to be lower and the like, which are caused by pressure transmission loss caused by unidirectional pressing in the hot-pressing sintering process of the conventional common die, so that the product quality and the production efficiency are improved.
In order to solve the problems, the utility model adopts the following technical scheme: a hot pressing sintering mould of two-way pressing, the mould is made up of carbon-carbon compound overcoat, graphite bush, graphite picture peg, graphite upper pressure head, graphite backing plate, graphite base, there are ceramic cold pressing pieces between the multi-layer graphite backing plate; a graphite upper pressure head is arranged above the top-layer graphite backing plate; the graphite upper pressure head, the graphite backing plate and the ceramic cold pressing piece form a cylindrical structure and are arranged on the lug boss on the graphite base, and the inner wall of the graphite inserting plate is matched with the outer edge of the cylindrical structure formed by the graphite upper pressure head, the graphite backing plate and the ceramic cold pressing piece; the graphite inserting plate is hung on the graphite upper pressure head, the graphite lining is sleeved outside the graphite inserting plate, and the carbon-carbon composite outer sleeve is sleeved outside the graphite lining; gaps are reserved between the graphite inserting plate, the graphite lining, the bottom of the carbon-carbon composite outer sleeve and the upper surface of the graphite base.
Further, the hot-pressing sintering mold for bidirectional pressing provided by the utility model has the following characteristics: the graphite inserting plate comprises at least three sections, and the graphite inserting plate is spliced into a full-surrounding structure and is hung on the graphite upper pressure head.
Further, the hot-pressing sintering mold for bidirectional pressing provided by the utility model has the following characteristics: the top layer graphite backing plate and the bottom layer graphite backing plate are of independent structures.
Further, the hot-pressing sintering mold for bidirectional pressing provided by the utility model has the following characteristics: the parts of the graphite upper pressure head, the graphite inserting plate and the graphite lining for hanging and sleeving are all bulges with radians.
The utility model has the beneficial effects that: 1. in the hot-pressing sintering process, compared with the unidirectional stress of the ceramic cold pressing piece in the traditional hot-pressing die, the ceramic cold pressing piece is stressed bidirectionally, so that the pressure transmission loss is obviously reduced, the thickness and the density gradient distribution of the final sintering blank are obviously improved, and the final sintering blank is easier to obtain good sintering density and thickness uniformity so as to improve the product quality.
2. In the hot-pressing sintering process, the utility model obviously reduces the pressure transmission loss, so that more products can be sintered in one hot-pressing sintering process, thereby improving the production efficiency, greatly reducing the sintering cost and improving the utilization rate of equipment.
3. The graphite inserting plate has at least three sections which are spliced together to form a full-surrounding structure, the inner wall of the full-surrounding structure is matched with the graphite backing plate and the outer edge of the product, and the outer wall of the full-surrounding structure is spliced to form a cylinder shape, so that the quick assembly and disassembly of the die are facilitated.
4. The top layer graphite backing plate and the bottom layer graphite backing plate are of independent structures, and the quality of the topmost ceramic product and the bottommost ceramic product can be guaranteed.
5. The parts of the graphite upper pressure head, the graphite inserting plate and the graphite lining for hanging and sleeving are all bulges with radians, so that fine adjustment of the position of the mould after internal stress in the process of assembling and hot pressing is facilitated, stress concentration points are reduced, and the mould is prevented from being damaged.
Drawings
FIG. 1 is a schematic structural view of the present invention;
figure 2 is a top view of a graphite insert plate.
The symbols in the drawings illustrate that: the carbon-carbon composite plate comprises a carbon-carbon composite outer sleeve 1, a graphite lining 2, a graphite inserting plate 3, a top-layer graphite backing plate 4, a graphite upper pressure head 5, a middle graphite backing plate 6, a ceramic cold pressing part 7, a bottom-layer graphite backing plate 8 and a graphite base 9.
Detailed Description
The present invention will be described in detail with reference to the following preferred embodiments.
As shown in fig. 1-2, a hot-pressing sintering mold for bidirectional pressing is composed of a carbon-carbon composite jacket 1, a graphite lining 2, a graphite inserting plate 3, a top graphite backing plate 4, a graphite upper pressing head 5, an intermediate graphite backing plate 6, a bottom graphite backing plate 8 and a graphite base 9, wherein ceramic cold pressing pieces 7 are arranged among multiple layers of intermediate graphite backing plates 6; middle graphite backing plate 6 and ceramic cold pressing spare 7 top set up top layer graphite backing plate 4, the below sets up bottom graphite backing plate 8, and top layer graphite backing plate 4 top is provided with pressure head 5 on the graphite, and top layer graphite backing plate 4, bottom graphite backing plate 8 are independent structure, are favorable to guaranteeing the quality of top and bottom ceramic finished piece. The graphite upper pressure head 5, the top-layer graphite backing plate 4, the middle graphite backing plate 6, the ceramic cold pressing piece 7 and the bottom-layer graphite backing plate 8 form a cylindrical structure and are arranged above the lug boss on the graphite base 9; the graphite inserting plate 3 comprises at least three sections, the graphite inserting plate 3 is spliced into a full-surrounding structure together, the inner wall of the graphite inserting plate 3 is matched with the outer edges of the top-layer graphite backing plate 4, the middle graphite backing plate 6, the ceramic cold pressing part 7 and the bottom-layer graphite backing plate 8, the graphite inserting plate 3 is hung on the graphite upper pressing head 5, and the outer wall of the graphite inserting plate 3 is spliced into a cylinder shape so as to be beneficial to the quick assembly and disassembly of the die. The graphite bush 2 is sleeved and hung outside the graphite inserting plate 3, and the carbon-carbon composite outer sleeve 1 is sleeved and hung outside the graphite bush 2; gaps are reserved between the graphite inserting plate 3, the graphite lining 2, the bottom of the carbon-carbon composite outer sleeve 1 and the upper surface of the graphite base 9.
The periphery of the upper part of the graphite upper pressure head 5 is a contracted cylindrical structure, the convex part below the contracted part is an arc transition structure 5-1, the upper edge of the inner edge of the graphite inserting plate 3 is provided with a bulge 3-1, and the arc shape of the side of the bulge 3-1 is matched with the arc transition structure 5-1 to hang the graphite inserting plate 3 on the graphite upper pressure head 5.
The lower edge of the outer side of the graphite inserting plate 3 is of a convex structure, the upper side of the convex structure is of an inwards concave arc-shaped structure 3-2, the lower edge of the inner side of the graphite lining 2 is of an outwards convex arc-shaped structure 2-1, and the outwards convex arc-shaped structure 2-1 is matched with the inwards concave arc-shaped structure 3-2 to hang the graphite lining 2 outside the graphite inserting plate 3 in a sleeved mode.
The lower edge of the outer side of the graphite bush 2 is of a convex structure, the upper side of the convex structure is of an inwards concave arc-shaped structure 2-2, the lower edge of the inner side of the carbon-carbon composite sleeve 1 is of an outwards convex arc-shaped structure 1-1, and the outwards convex arc-shaped structure 1-1 is matched with the inwards concave arc-shaped structure 2-2 to hang the carbon-carbon composite sleeve 1 outside the graphite bush 2.
The positions of the graphite upper pressure head 5, the graphite inserting plate 3 and the graphite lining 2 used for hanging and sleeving are all bulges with radians, so that fine adjustment of the position of the mould after internal stress in the process of assembly and hot pressing is facilitated, stress concentration points are reduced, and the mould is prevented from being damaged.
When the mold is used, the mold is assembled in the sequence of the graphite base 9 → the bottom graphite shim plate 8 → the ceramic cold pressing part 7, the middle graphite shim plate 6, and the ceramic cold pressing part 7 alternately → the top graphite shim plate 4 → the graphite upper pressure head 5 → the graphite insert plate 3 → the graphite bush 2 → the carbon-carbon composite outer sleeve 1. The graphite inserting plate 3 is hung on the graphite upper pressure head 5, the graphite lining 2 is hung on the graphite inserting plate 3 in a sleeved mode and tightly hooped, and the carbon-carbon composite outer sleeve 1 is hung on the graphite lining 2 in a sleeved mode and tightly hooped.
And placing the assembled die into a hot-pressing sintering furnace for sintering. In the whole using process, the graphite inserting plate 3, the graphite lining 2 and the bottom of the carbon-carbon composite outer sleeve 1 are not in contact with the graphite base 9, so that the bidirectional stress of the ceramic cold pressing piece is ensured. The reduction of the pressure transmission loss during the hot press sintering improves the gradient distribution of the thickness and density of the green compact. Moreover, because the pressure transmission loss is obviously reduced, more products can be sintered in one hot-pressing sintering process, so that the production efficiency is improved, the sintering cost is greatly reduced, and the utilization rate of equipment is also improved.
The above embodiments are only used to further illustrate the bi-directional pressing hot pressing sintering mold of the present invention, but the present invention is not limited to the embodiments, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention fall within the protection scope of the technical solution of the present invention.
Claims (7)
1. A hot-pressing sintering mould with bidirectional pressing is characterized in that the mould consists of a carbon-carbon composite outer sleeve, a graphite lining, a graphite inserting plate, a graphite upper pressing head, graphite base plates and a graphite base, wherein a ceramic cold pressing piece is arranged among a plurality of layers of graphite base plates; a graphite upper pressure head is arranged above the top-layer graphite backing plate; the graphite upper pressure head, the graphite backing plate and the ceramic cold pressing piece form a cylindrical structure and are arranged on the lug boss on the graphite base, and the inner wall of the graphite inserting plate is matched with the outer edge of the cylindrical structure formed by the graphite upper pressure head, the graphite backing plate and the ceramic cold pressing piece; the graphite inserting plate is hung on the graphite upper pressure head, the graphite lining is sleeved outside the graphite inserting plate, and the carbon-carbon composite outer sleeve is sleeved outside the graphite lining; gaps are reserved between the graphite inserting plate, the graphite lining, the bottom of the carbon-carbon composite outer sleeve and the upper surface of the graphite base.
2. The bi-directional compression hot pressing sintering mold as claimed in claim 1, wherein the graphite insert plate comprises at least three segments, and the graphite insert plate is assembled into a full-surrounding structure and is hung on the graphite upper pressure head.
3. The bi-directional compression hot pressing sintering mold of claim 1, wherein the top and bottom graphite backing plates are of independent construction.
4. The bi-directional pressing hot pressing sintering mold as claimed in claim 1, wherein the parts of the graphite upper pressing head, the graphite inserting plate and the graphite lining for hanging and sleeving are all protrusions with radian.
5. The hot pressing sintering mold according to claim 1 or 4, wherein the graphite upper pressing head has a contracting cylindrical structure at the upper periphery, an arc transition structure at the lower protruding part of the contracting part, and a protrusion at the upper edge of the graphite inserting plate, wherein the arc shape of the protruding side matches with the arc transition structure to hang the graphite inserting plate on the graphite upper pressing head.
6. The hot pressing sintering mold according to claim 1 or 4, wherein the lower edge of the outer side of the graphite insert plate is of a convex structure, the upper side of the convex structure is of a concave arc structure, the lower edge of the inner side of the graphite lining is of a convex arc structure, and the convex arc structure is matched with the concave arc structure to hang the graphite lining on the outer side of the graphite insert plate.
7. The mold according to claim 1 or 4, wherein the graphite lining has a convex outer lower edge, the convex outer lower edge has a concave arc shape, the carbon-carbon composite sheath has an outer convex lower edge, and the outer convex arc fits the concave arc structure to hang the carbon-carbon composite sheath on the graphite lining.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115301949A (en) * | 2022-07-05 | 2022-11-08 | 华中科技大学 | Sintering box and application thereof, and tungsten-copper pseudo-binary alloy powder injection molding method |
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2021
- 2021-10-14 CN CN202122473651.0U patent/CN215902725U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115301949A (en) * | 2022-07-05 | 2022-11-08 | 华中科技大学 | Sintering box and application thereof, and tungsten-copper pseudo-binary alloy powder injection molding method |
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