CN102992766B - Production process for high-density isotropic isostatic-pressed round graphite hollow-core blank - Google Patents
Production process for high-density isotropic isostatic-pressed round graphite hollow-core blank Download PDFInfo
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Abstract
The invention discloses a production process for a high-density isotropic isostatic-pressed round graphite hollow-core blank. The production process comprises the steps: preparing green graphite blank powder; placing the prepared green graphite blank powder into a special hollow core mold for a hydraulic press for performing and demolding; filling the formed blank into a mold bushing and vacuumizing; placing the vacuumized blank into a cold isostatic press for pressing under the pressing pressure of 150-180MPa to obtain a green blank; roasting and steeping the green blank; and graphitizing to obtain the finished product. According to the production process, the production specifications and varieties are diversified, different specifications of special hollow core molds for the hydraulic press are used for production according to the demand of users to obtain diversified round graphite hollow-core blanks, and the outer diameter, inner diameter and height of the blanks can be randomly designed according to the product demand; the density is high, and the density of the final isotropic isostatic-pressed graphite hollow-core blank can achieve 1.87-1.90g/cm<2>; and the internal density and the external density are uniform, and the density difference between the inner rings and the outer rings of the blanks is within 1%.
Description
Technical field
The present invention relates to the production technique of the circular hollow blank of a kind of high-density isotropic isostatic pressing formed graphite.
Background technology
Isostatic pressing formed graphite material has good conduction, heat conductivility, have simultaneously high temperature strength and corrosion resistance and good, self-lubricating, volume density high, be easy to a series of features such as skilled worker, and be closely connected with current high-tech cutting edge technology, be widely used in many fields such as new forms of energy, aerospace.
At present, the various circular graphite blank that isotropy isostatic pressing formed graphite manufacturer produces is mainly taking solid blank as main, and it has following shortcoming:
(1) product specification is single, and the demander of hollow product is provided for ask for something, and solid blank has not only increased the cost of the purchasing of raw materials, and has greatly increased post-treatment workload, causes great waste;
(2) density of graphite product is lower, and low-density graphite product often can not reach technique service requirements;
(3) the inside and outside density difference of blank is larger, and interior outer density differs and reaches 5%～8%.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of production specification and diversification of varieties are provided, density is high, and the production technique of the circular hollow blank of the high-density isotropic isostatic pressing formed graphite of inside and outside even density.
The object of the invention is to be achieved through the following technical solutions: the production technique of the circular hollow blank of a kind of high-density isotropic isostatic pressing formed graphite, it comprises the following steps:
S1: preparation graphite green compact powder, its process for preparation is:
S101: powder process: secondary Jiao, hard pitch and isotropy Jiao are pulverized to abrasive dust, make the fine powder that median size is 1～15um;
S102: the powder preparing is in proportion carried out in strong kneader to kneading, 180～220 DEG C of kneading temperatures, kneading time 1～1.5h; The heat material of kneading is rolled to sheet, and rolling temperature is 170～230 DEG C, and rolling number of times is 3～6 times;
S103: cooled tablet is through secondary breaking post-heating to 30～85 DEG C, and the particle size after cracking of secondary breaking is 0.5～1mm;
S2: the graphite green compact powder preparing is put into the special hollow mould of hydropress and carry out premolding and the demoulding;
S3: vacuumize vacuum tightness 18000～25000Pa after packing the blank after moulding into die sleeve;
S4: the blank after vacuumizing is put into cold isostatic press and suppress, pressing pressure 150～180MPa, obtains green compact;
S5: green compact roasting, dipping: green compact are packed in metallic crucible and be placed in and carry out roasting in stoving oven, be warming up to 1300 DEG C with the heat-up rate of 1～15 DEG C per hour, complete roasting for the first time, cooling come out of the stove to be placed under the pressure that is greater than the temperature of 200 DEG C and 2.0Mpa adopt mid-temperature pitch as soaker, more than dipping 3h, complete dipping for the first time with this, base substrate after dipping is for the first time packed into and in stoving oven, carries out roasting for the second time, for the second time after the base substrate naturally cooling after roasting, more than being placed in and adopting hard pitch dipping 4h under the pressure that is greater than the temperature of 320 DEG C and 3.5MPa, complete dipping for the second time, base substrate after dipping carries out roasting for the third time for the second time, second, the temperature of roasting is for the third time 800～1100 DEG C,
S6: greying also obtains finished product: the lagging material of the base substrate after roasting for the third time is coated, be positioned in graphitizing furnace and be warming up to 2900 DEG C with the heat-up rate that is not less than 100 DEG C per hour, after greying completes, cooling coming out of the stove makes the circular hollow blank of graphite.
Powder described in step S102 of the present invention is made up of the component of following weight percent: secondary Jiao 65～75, and hard pitch 20～24, isotropy Jiao 1～5.
The special hollow mould of hydropress of the present invention comprises die ontology, seaming chuck, push-down head and core bar, push-down head is installed on core bar bottom, the central position of seaming chuck is provided with the core bar hole matching with core bar, seaming chuck is connected on core bar by core bar borehole jack, and die ontology is socketed on seaming chuck and push-down head.
Push-down head of the present invention is provided with at least one demoulding hole.
Core bar of the present invention is provided with cushion block near one end of push-down head.
Cushion block of the present invention and core bar adopt integrated molding structure.
The invention has the beneficial effects as follows:
(1) production specification and diversification of varieties, can use the special hollow die production of hydropress of different size obtain the circular hollow blank of diversified graphite according to user's demand, external diameter, the internal diameter of blank and highly all can designing arbitrarily according to product demand;
(2) density is high, the density reachable 1.87～1.90g/cm of the circular hollow blank of final isotropy isostatic pressing formed graphite
3;
(3) inside and outside even density, the density difference of blank inner ring and outer ring is in 1%.
Brief description of the drawings
Fig. 1 is the schema of production technique of the present invention;
Fig. 2 is the structural representation of the special hollow mould of hydropress of the present invention;
In figure, 1-die ontology, 2-seaming chuck, 3-push-down head, 4-core bar, 5-core bar hole, 6-demoulding hole, 7-cushion block.
Embodiment
Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is described in further detail, but protection scope of the present invention is not limited to the following stated.
[embodiment 1] as shown in Figure 1, the production technique of the circular hollow blank of a kind of high-density isotropic isostatic pressing formed graphite, it comprises the following steps:
S1: preparation graphite green compact powder, its process for preparation is:
S101: powder process: secondary Jiao, hard pitch and isotropy Jiao are pulverized to abrasive dust, make the fine powder that median size is 1um;
S102: the powder preparing is in proportion carried out in strong kneader to kneading, 180 DEG C of kneading temperatures, kneading time 1.5h; The heat material of kneading is rolled to sheet, and rolling temperature is 170 DEG C, and rolling number of times is 6 times, and wherein, powder is made up of the component of following weight percent: secondary Jiao 65, and hard pitch 24, isotropy Jiao 1;
S103: cooled tablet is through secondary breaking post-heating to 85 DEG C, and the particle size after cracking of secondary breaking is 1mm;
S2: the graphite green compact powder preparing is put into the special hollow mould of hydropress and carry out premolding and the demoulding; Specification is:
External diameter
Internal diameter
Height 520mm～620mm;
S3: vacuumize vacuum tightness 18000Pa after packing the blank after moulding into die sleeve;
S4: the blank after vacuumizing is put into cold isostatic press and suppress, pressing pressure 150MPa, obtains green compact;
S5: green compact roasting, dipping: green compact are packed in metallic crucible and be placed in and carry out roasting in stoving oven, be warming up to 1300 DEG C with the heat-up rate of 1 DEG C per hour, complete roasting for the first time, cooling come out of the stove to be placed under the pressure of the temperature of 250 DEG C and 2.0Mpa adopt mid-temperature pitch as soaker, dipping 3.5h, complete dipping for the first time with this, base substrate after dipping is for the first time packed into and in stoving oven, carries out roasting for the second time, for the second time after the base substrate naturally cooling after roasting, be placed under the pressure of the temperature of 350 DEG C and 3.5MPa and adopt hard pitch dipping 4.5h, complete dipping for the second time, base substrate after dipping carries out roasting for the third time for the second time, second, the temperature of roasting is for the third time 1100 DEG C,
S6: greying also obtains finished product: the lagging material of the base substrate after roasting for the third time is coated, be positioned in graphitizing furnace and be warming up to 2900 DEG C with the heat-up rate of 120 DEG C per hour, after greying completes, cooling coming out of the stove makes the circular hollow blank of graphite.
[embodiment 2] as shown in Figure 1, the production technique of the circular hollow blank of a kind of high-density isotropic isostatic pressing formed graphite, it comprises the following steps:
S1: preparation graphite green compact powder, its process for preparation is:
S101: powder process: secondary Jiao, hard pitch and isotropy Jiao are pulverized to abrasive dust, make the fine powder that median size is 15um;
S102: the powder preparing is in proportion carried out in strong kneader to kneading, 220 DEG C of kneading temperatures, kneading time 1h; The heat material of kneading is rolled to sheet, and rolling temperature is 230 DEG C, and rolling number of times is 3 times, and wherein, powder is made up of the component of following weight percent: secondary Jiao 75, and hard pitch 20, isotropy Jiao 5;
S103: cooled tablet is through secondary breaking post-heating to 30 DEG C, and the particle size after cracking of secondary breaking is 0.5mm;
S2: the graphite green compact powder preparing is put into the special hollow mould of hydropress and carry out premolding and the demoulding; Specification is:
External diameter
Internal diameter
Height 520mm～660mm;
S3: vacuumize vacuum tightness 25000Pa after packing the blank after moulding into die sleeve;
S4: the blank after vacuumizing is put into cold isostatic press and suppress, pressing pressure 180MPa, obtains green compact;
S5: green compact roasting, dipping: green compact are packed in metallic crucible and be placed in and carry out roasting in stoving oven, be warming up to 1300 DEG C with the heat-up rate of 15 DEG C per hour, complete roasting for the first time, cooling come out of the stove to be placed under the pressure of the temperature of 220 DEG C and 2.0Mpa adopt mid-temperature pitch as soaker, dipping 3.2h, complete dipping for the first time with this, base substrate after dipping is for the first time packed into and in stoving oven, carries out roasting for the second time, for the second time after the base substrate naturally cooling after roasting, be placed under the pressure of the temperature of 340 DEG C and 3.5MPa and adopt hard pitch dipping 4.2h, complete dipping for the second time, base substrate after dipping carries out roasting for the third time for the second time, second, the temperature of roasting is for the third time 800 DEG C,
S6: greying also obtains finished product: the lagging material of the base substrate after roasting for the third time is coated, be positioned in graphitizing furnace and be warming up to 2900 DEG C with the heat-up rate of 150 DEG C per hour, after greying completes, cooling coming out of the stove makes the circular hollow blank of graphite.
[embodiment 3] as shown in Figure 1, the production technique of the circular hollow blank of a kind of high-density isotropic isostatic pressing formed graphite, it comprises the following steps:
S1: preparation graphite green compact powder, its process for preparation is:
S101: powder process: secondary Jiao, hard pitch and isotropy Jiao are pulverized to abrasive dust, make the fine powder that median size is 10um;
S102: the powder preparing is in proportion carried out in strong kneader to kneading, 200 DEG C of kneading temperatures, kneading time 1.2h; The heat material of kneading is rolled to sheet, and rolling temperature is 200 DEG C, and rolling number of times is 5 times, and wherein, powder is made up of the component of following weight percent: secondary Jiao 70, and hard pitch 22, isotropy Jiao 3;
S103: cooled tablet is through secondary breaking post-heating to 57 DEG C, and the particle size after cracking of secondary breaking is 0.8mm;
S2: the graphite green compact powder preparing is put into the special hollow mould of hydropress and carry out premolding and the demoulding; Specification is:
External diameter
Internal diameter
Height 660mm～710mm;
S3: vacuumize vacuum tightness 20000Pa after packing the blank after moulding into die sleeve;
S4: the blank after vacuumizing is put into cold isostatic press and suppress, pressing pressure 165MPa, obtains green compact;
S5: green compact roasting, dipping: green compact are packed in metallic crucible and be placed in and carry out roasting in stoving oven, be warming up to 1300 DEG C with the heat-up rate of 8 DEG C per hour, complete roasting for the first time, cooling come out of the stove to be placed under the pressure of the temperature of 300 DEG C and 2.0Mpa adopt mid-temperature pitch as soaker, dipping 4h, complete dipping for the first time with this, base substrate after dipping is for the first time packed into and in stoving oven, carries out roasting for the second time, for the second time after the base substrate naturally cooling after roasting, be placed under the pressure of the temperature of 350 DEG C and 3.5MPa and adopt hard pitch dipping 4.5h, complete dipping for the second time, base substrate after dipping carries out roasting for the third time for the second time, second, the temperature of roasting is for the third time 950 DEG C,
S6: greying also obtains finished product: the lagging material of the base substrate after roasting for the third time is coated, be positioned in graphitizing furnace and be warming up to 2900 DEG C with the heat-up rate of 140 DEG C per hour, after greying completes, cooling coming out of the stove makes the circular hollow blank of graphite.
[embodiment 4] as shown in Figure 1, the production technique of the circular hollow blank of a kind of high-density isotropic isostatic pressing formed graphite, it comprises the following steps:
S1: preparation graphite green compact powder, its process for preparation is:
S101: powder process: secondary Jiao, hard pitch and isotropy Jiao are pulverized to abrasive dust, make the fine powder that median size is 8um;
S102: the powder preparing is in proportion carried out in strong kneader to kneading, 210 DEG C of kneading temperatures, kneading time 1.3h; The heat material of kneading is rolled to sheet, and rolling temperature is 210 DEG C, and rolling number of times is 4 times, and wherein, powder is made up of the component of following weight percent: secondary Jiao 72, and hard pitch 22, isotropy Jiao 4;
S103: cooled tablet is through secondary breaking post-heating to 50 DEG C, and the particle size after cracking of secondary breaking is 0.7mm;
S2: the graphite green compact powder preparing is put into the special hollow mould of hydropress and carry out premolding and the demoulding; Specification is:
External diameter
Internal diameter
Height 660mm～710mm;
S3: vacuumize vacuum tightness 22000Pa after packing the blank after moulding into die sleeve;
S4: the blank after vacuumizing is put into cold isostatic press and suppress, pressing pressure 160MPa, obtains green compact;
S5: green compact roasting, dipping: green compact are packed in metallic crucible and be placed in and carry out roasting in stoving oven, be warming up to 1300 DEG C with the heat-up rate of 10 DEG C per hour, complete roasting for the first time, cooling come out of the stove to be placed under the pressure of the temperature of 280 DEG C and 2.0Mpa adopt mid-temperature pitch as soaker, dipping 3.3h, complete dipping for the first time with this, base substrate after dipping is for the first time packed into and in stoving oven, carries out roasting for the second time, for the second time after the base substrate naturally cooling after roasting, be placed under the pressure of the temperature of 330 DEG C and 3.5MPa and adopt hard pitch dipping 4.3h, complete dipping for the second time, base substrate after dipping carries out roasting for the third time for the second time, second, the temperature of roasting is for the third time 1000 DEG C,
S6: greying also obtains finished product: the lagging material of the base substrate after roasting for the third time is coated, be positioned in graphitizing furnace and be warming up to 2900 DEG C with the heat-up rate of 200 DEG C per hour, after greying completes, cooling coming out of the stove makes the circular hollow blank of graphite.
[embodiment 5] as shown in Figure 1, the production technique of the circular hollow blank of a kind of high-density isotropic isostatic pressing formed graphite, it comprises the following steps:
S1: preparation graphite green compact powder, its process for preparation is:
S101: powder process: secondary Jiao, hard pitch and isotropy Jiao are pulverized to abrasive dust, make the fine powder that median size is 5um;
S102: the powder preparing is in proportion carried out in strong kneader to kneading, 210 DEG C of kneading temperatures, kneading time 1.4h; The heat material of kneading is rolled to sheet, and rolling temperature is 180 DEG C, and rolling number of times is 5 times, and wherein, powder is made up of the component of following weight percent: secondary Jiao 68, and hard pitch 21, isotropy Jiao 4;
S103: cooled tablet is through secondary breaking post-heating to 60 DEG C, and the particle size after cracking of secondary breaking is 0.6mm;
S2: the graphite green compact powder preparing is put into the special hollow mould of hydropress and carry out premolding and the demoulding; Specification is:
External diameter
Internal diameter
Height 660mm;
S3: vacuumize vacuum tightness 23000Pa after packing the blank after moulding into die sleeve;
S4: the blank after vacuumizing is put into cold isostatic press and suppress, pressing pressure 170MPa, obtains green compact;
S5: green compact roasting, dipping: green compact are packed in metallic crucible and be placed in and carry out roasting in stoving oven, be warming up to 1300 DEG C with the heat-up rate of 5 DEG C per hour, complete roasting for the first time, cooling come out of the stove to be placed under the pressure of the temperature of 300 DEG C and 2.0Mpa adopt mid-temperature pitch as soaker, dipping 4.5h, complete dipping for the first time with this, base substrate after dipping is for the first time packed into and in stoving oven, carries out roasting for the second time, for the second time after the base substrate naturally cooling after roasting, be placed under the pressure of the temperature of 380 DEG C and 3.5MPa and adopt hard pitch dipping 5h, complete dipping for the second time, base substrate after dipping carries out roasting for the third time for the second time, second, the temperature of roasting is for the third time 900 DEG C,
S6: greying also obtains finished product: the lagging material of the base substrate after roasting for the third time is coated, be positioned in graphitizing furnace and be warming up to 2900 DEG C with the heat-up rate of 250 DEG C per hour, after greying completes, cooling coming out of the stove makes the circular hollow blank of graphite.
[embodiment 6] as shown in Figure 1, the production technique of the circular hollow blank of a kind of high-density isotropic isostatic pressing formed graphite, it comprises the following steps:
S1: preparation graphite green compact powder, its process for preparation is:
S101: powder process: secondary Jiao, hard pitch and isotropy Jiao are pulverized to abrasive dust, make the fine powder that median size is 3um;
S102: the powder preparing is in proportion carried out in strong kneader to kneading, 210 DEG C of kneading temperatures, kneading time 1.3h; The heat material of kneading is rolled to sheet, and rolling temperature is 220 DEG C, and rolling number of times is 5 times, and wherein, powder is made up of the component of following weight percent: secondary Jiao 72, and hard pitch 21, isotropy Jiao 3;
S103: cooled tablet is through secondary breaking post-heating to 70 DEG C, and the particle size after cracking of secondary breaking is 0.6mm;
S2: the graphite green compact powder preparing is put into the special hollow mould of hydropress and carry out premolding and the demoulding; Specification is:
External diameter
Internal diameter
Height 450mm;
S3: vacuumize vacuum tightness 24000Pa after packing the blank after moulding into die sleeve;
S4: the blank after vacuumizing is put into cold isostatic press and suppress, pressing pressure 160MPa, obtains green compact;
S5: green compact roasting, dipping: green compact are packed in metallic crucible and be placed in and carry out roasting in stoving oven, be warming up to 1300 DEG C with the heat-up rate of 12 DEG C per hour, complete roasting for the first time, cooling come out of the stove to be placed under the pressure of the temperature of 230 DEG C and 2.0Mpa adopt mid-temperature pitch as soaker, dipping 3.5h, complete dipping for the first time with this, base substrate after dipping is for the first time packed into and in stoving oven, carries out roasting for the second time, for the second time after the base substrate naturally cooling after roasting, be placed under the pressure of the temperature of 340 DEG C and 3.5MPa and adopt hard pitch dipping 4.8h, complete dipping for the second time, base substrate after dipping carries out roasting for the third time for the second time, second, the temperature of roasting is for the third time 1000 DEG C,
S6: greying also obtains finished product: the lagging material of the base substrate after roasting for the third time is coated, be positioned in graphitizing furnace and be warming up to 2900 DEG C with the heat-up rate of 120 DEG C per hour, after greying completes, cooling coming out of the stove makes the circular hollow blank of graphite.
[embodiment 7] as shown in Figure 1, the production technique of the circular hollow blank of a kind of high-density isotropic isostatic pressing formed graphite, it comprises the following steps:
S1: preparation graphite green compact powder, its process for preparation is:
S101: powder process: secondary Jiao, hard pitch and isotropy Jiao are pulverized to abrasive dust, make the fine powder that median size is 5um;
S102: the powder preparing is in proportion carried out in strong kneader to kneading, 200 DEG C of kneading temperatures, kneading time 1.2h; The heat material of kneading is rolled to sheet, and rolling temperature is 200 DEG C, and rolling number of times is 5 times, and wherein, powder is made up of the component of following weight percent: secondary Jiao 70, and hard pitch 22, isotropy Jiao 4;
S103: cooled tablet is through secondary breaking post-heating to 50 DEG C, and the particle size after cracking of secondary breaking is 0.6mm;
S2: the graphite green compact powder preparing is put into the special hollow mould of hydropress and carry out premolding and the demoulding; Specification is:
External diameter
Internal diameter
Height 370mm;
S3: vacuumize vacuum tightness 20000Pa after packing the blank after moulding into die sleeve;
S4: the blank after vacuumizing is put into cold isostatic press and suppress, pressing pressure 160MPa, obtains green compact;
S5: green compact roasting, dipping: green compact are packed in metallic crucible and be placed in and carry out roasting in stoving oven, be warming up to 1300 DEG C with the heat-up rate of 8 DEG C per hour, complete roasting for the first time, cooling come out of the stove to be placed under the pressure of the temperature of 250 DEG C and 2.0Mpa adopt mid-temperature pitch as soaker, dipping 3.3h, complete dipping for the first time with this, base substrate after dipping is for the first time packed into and in stoving oven, carries out roasting for the second time, for the second time after the base substrate naturally cooling after roasting, be placed under the pressure of the temperature of 350 DEG C and 3.5MPa and adopt hard pitch dipping 4.3h, complete dipping for the second time, base substrate after dipping carries out roasting for the third time for the second time, second, the temperature of roasting is for the third time 1000 DEG C,
S6: greying also obtains finished product: the lagging material of the base substrate after roasting for the third time is coated, be positioned in graphitizing furnace and be warming up to 2900 DEG C with the heat-up rate of 120 DEG C per hour, after greying completes, cooling coming out of the stove makes the circular hollow blank of graphite.
As shown in Figure 2, the special hollow mould of hydropress comprises die ontology 1, seaming chuck 2, push-down head 3 and core bar 4, push-down head 3 is installed on core bar 4 bottoms, the central position of seaming chuck 2 is provided with the core bar hole 5 matching with core bar 4, seaming chuck 2 is socketed on core bar 4 by core bar hole 5, and die ontology 1 is socketed on seaming chuck 2 and push-down head 3.Push-down head 3 is provided with two demoulding holes 6, and demoulding hole 6 is for the demoulding after moulding.Core bar 4 is provided with cushion block 7 near one end of push-down head 3, and cushion block 7 adopts integrated molding structure with core bar 4.
In premolding and knockout course, first select the specification of hollow mould according to the blank specification of required processing, graphite blank is packed in the die cavity that die ontology 1 and core bar 4 surround, cover seaming chuck 2, open hydropress and be pressed; After to be formed completing, utilize demoulding hole 6 to carry out the demoulding, take out the circular hollow blank after moulding.
The circular hollow blank of high-density isotropic isostatic pressing formed graphite going out according to above explained hereafter comprises following several specification, and the interior outer density of the circular hollow blank of graphite of producing by following specification is shown as follows:
Claims (1)
1. a production technique for the circular hollow blank of high-density isotropic isostatic pressing formed graphite, is characterized in that: it comprises the following steps:
S1: preparation graphite green compact powder, its process for preparation is:
S101: powder process: secondary Jiao, hard pitch and isotropy Jiao are pulverized to abrasive dust, make the fine powder that median size is 1～15um;
S102: will be secondary Jiao 65～75 by weight percentage, hard pitch 20～24, the powder that isotropy Jiao 1～5 ratio prepares carries out kneading in strong kneader, 180～220 DEG C of kneading temperatures, kneading time 1～1.5h; The heat material of kneading is rolled to sheet, and rolling temperature is 170～230 DEG C, and rolling number of times is 3～6 times;
S103: cooled tablet is through secondary breaking post-heating to 30～85 DEG C, and the particle size after cracking of secondary breaking is 0.5～1mm;
S2: the graphite green compact powder preparing is put into the special hollow mould of hydropress and carry out premolding and the demoulding, the special hollow mould of described hydropress comprises die ontology (1), seaming chuck (2), push-down head (3) and core bar (4), push-down head (3) is installed on core bar (4) bottom, the central position of seaming chuck (2) is provided with the core bar hole (5) matching with core bar (4), it is upper that seaming chuck (2) is socketed in core bar (4) by core bar hole (5), and die ontology (1) is socketed on seaming chuck (2) and push-down head (3); Described push-down head (3) be provided with at least one for premolding after the demoulding hole (6) of the demoulding, core bar (4) is provided with cushion block (7) near one end of push-down head (3), cushion block (7) adopts integrated molding structure with core bar (4); In premolding and knockout course, first select the specification of hollow mould according to the blank specification of required processing, graphite green compact powder is packed in the die cavity that die ontology (1) and core bar (4) surround, cover seaming chuck (2), opening hydropress is pressed, after moulding completes, utilize demoulding hole (6) to carry out the demoulding, take out the circular hollow blank after moulding;
S3: vacuumize vacuum tightness 18000～25000Pa after packing the blank after moulding into die sleeve;
S4: the blank after vacuumizing is put into cold isostatic press and suppress, pressing pressure 150～180MPa, obtains green compact;
S5: green compact roasting, dipping: green compact are packed in metallic crucible and be placed in and carry out roasting in stoving oven, be warming up to 1300 DEG C with the heat-up rate of 1～15 DEG C per hour, complete roasting for the first time, cooling come out of the stove to be placed under the pressure that is greater than the temperature of 200 DEG C and 2.0Mpa adopt mid-temperature pitch as soaker, more than dipping 3h, complete dipping for the first time with this, base substrate after dipping is for the first time packed into and in stoving oven, carries out roasting for the second time, for the second time after the base substrate naturally cooling after roasting, more than being placed in and adopting hard pitch dipping 4h under the pressure that is greater than the temperature of 320 DEG C and 3.5MPa, complete dipping for the second time, base substrate after dipping carries out roasting for the third time for the second time, second, the temperature of roasting is for the third time 800～1100 DEG C,
S6: greying also obtains finished product: the lagging material of the base substrate after roasting for the third time is coated, be positioned in graphitizing furnace and be warming up to 2900 DEG C with the heat-up rate that is not less than 100 DEG C per hour, after greying completes, cooling coming out of the stove makes the circular hollow blank of graphite.
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| CN112979313A (en) * | 2019-12-12 | 2021-06-18 | 中国科学院宁波材料技术与工程研究所 | Fluorescent ceramic and preparation method thereof |
| CN111483171B (en) * | 2020-04-22 | 2021-04-23 | 四川士达特种炭材有限公司 | Processing method for producing isostatic pressing cylindrical graphite by using isostatic pressing graphite barrel material forming die |
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| CN114043763A (en) * | 2021-09-17 | 2022-02-15 | 大同新成新材料股份有限公司 | Forming method of isostatic pressing small graphite block |
| CN115974555B (en) * | 2022-12-22 | 2024-01-26 | 江苏宏基高新材料股份有限公司 | Isostatic pressing graphite production process |
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