CN105290335A - Method for improving formability of ceramic mold core - Google Patents
Method for improving formability of ceramic mold core Download PDFInfo
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- CN105290335A CN105290335A CN201510764828.9A CN201510764828A CN105290335A CN 105290335 A CN105290335 A CN 105290335A CN 201510764828 A CN201510764828 A CN 201510764828A CN 105290335 A CN105290335 A CN 105290335A
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Abstract
The invention belongs to the field of single-crystal blade precision casting and particularly relates to a method for improving formability of a ceramic mold core. According to the method, quartz glass powder, zircon powder and 0.5-5% of quartz glass fiber chopped strands are mixed in a ball-milled mode to obtain a mixture, the mixture is added into dissolved plasticizer and stirred for at least 20 hours to obtain ceramic mold core slurry, a mold core is pressed on a mold core pressure injection machine, temperature of a mold is 25 DEG C-30 DEG C to obtain the ceramic mold core of a complex structure, or the mold is preheated to 38 DEG C-42 DEG C, and pressure of pressure injection is 1-3 Mpa and is kept for 50 s, so that the ceramic mold core with an exhausting seam being 0.3 mm thick is obtained. Liquidity of the ceramic mold core slurry is improved, the ceramic mold core of the complex structure is pressed and formed at the normal mold temperature, the mold core can be cooled completely in the mold, deformation of the mold core in the stripping and placing processes can be prevented, and the mold core with the exhausting seam being 0.3 mm thick can be pressed and formed at the mold temperature of 35 DEG C-42 DEG C.
Description
Technical field
The invention belongs to single crystal blade hot investment casting field, be specifically related to a kind of method improving ceramic core mouldability.
Background technology
The conventional pressing process of at present conventional labyrinth ceramic core is that heating mould to 40 DEG C ~ 45 DEG C → compacting core → orthotics is corrected.But because flowability of ceramic core slurry is poor, in order to make labyrinth ceramic core compressing, usually will by mold heated to 40 DEG C ~ 45 DEG C, cause ceramic core slurry can not cool completely in a mold, the stress produced when molding causes the plastic deformation of ceramic core.Although orthotics can reach certain orthopedic effect, often not ideal enough, and exhaust seam is only to the thick ceramic core of 0.3mm and is difficult to shaping especially.
And the method for traditional improvement flowability of ceramic core slurry is for adopting more coarse grained matrix powder, under the prerequisite not reducing plasticizer addition, dilution by increasing core slurry increases its mobility, core hygrometric state must be brought to suppress and to shrink the increase that level burns till contraction, and the increasing degree of its mobility is also limited, generally within 15%.
Summary of the invention
For prior art Problems existing, the invention provides a kind of method improving ceramic core mouldability, object improves the mobility of ceramic core slurry, realize labyrinth ceramic core compressing under mold temperature is normal temperature state, thus solve the problem of labyrinth ceramic core compacting distortion; Under can also realizing low-temperature condition, the compressing of core is stitched in the thick exhaust of 0.3mm, meets the needs of the thick single crystal blade development of thin-walled.
The technical scheme realizing the object of the invention is carried out according to following steps:
(1) ceramic core slurry is prepared: according to percentage by weight, by the F220 fused silica powder of 40% ~ 50%, the F600 fused silica powder of 20 ~ 30%, the zircon flour of 30% and 0.5% ~ 5% the short chopping of quartz glass fibre be placed in ball grinder, ball milling mixing 2 ~ 2.5 hours, obtains compound; The plasticizer accounting for compound weight 17% ~ 22% is joined in agitator, is heated to 110 DEG C ~ 120 DEG C, compound is joined in the plasticizer dissolved, stir at least 20 hours, obtain ceramic core slurry;
(2) on core press injector, suppress core, ceramic core slurry material feeding temperature is 95 DEG C ~ 105 DEG C, and mold temperature is 25 DEG C ~ 30 DEG C, and Pressure Casting 1 ~ 3Mpa, pressurize 50s, obtain labyrinth ceramic core; Or by mould and die preheating to 38 DEG C ~ 42 DEG C, Pressure Casting 1 ~ 3Mpa, pressurize 50s, obtain 0.3mm thick exhaust seam ceramic core.
Wherein, the short chopping diameter of described quartz glass fibre is 8 μm ~ 10 μm, length 1mm ~ 3mm.
Compared with prior art, feature of the present invention and beneficial effect are:
The present invention improves the mouldability of ceramic core slurry by the short chopping of quartz glass fibre adding 0.5% ~ 5% in the feed, make its mobility increasing degree more than 1 times, the mobility of slurry is increased to 380 ° ~ 460 ° by 190 ° ~ 220 ° of the prior art;
Due to adding of the short chopping of quartz glass fibre, can bring the increase of plasticizer addition in raw material, but can not increase the dilution of core slurry, can not reduce the high-temperature behavior of core, what also can not increase core burns till contraction;
The raising of flowability of ceramic core slurry, what can realize under the normal temperature mold temperature state of labyrinth ceramic core is compressing, core is cooled in a mold completely, distortion when core can be prevented in molding and place, can realize compressing under 35 DEG C ~ 42 DEG C mold temperature states of the thick exhaust seam core of 0.3mm.
Accompanying drawing explanation
Fig. 1 is the mould schematic diagram to flowability of ceramic core slurry test in the embodiment of the present invention.
Detailed description of the invention
The detection method of current slurry fluidity there is no national standard, the method adopted for the detection of flowability of ceramic core slurry in the present invention is: the pressure applying 2.5MPa on core press injector, the core slurry being heated to 100 DEG C ± 5 DEG C is compressed into core slurry fluidity testing mould, the involute of to be a sliver transvers section in described core slurry fluidity testing mould be 1mm diameter semicircle, as shown in Figure 1, its mobility is demarcated by the angle rotated of ceramic core slurry filling involute, angle is larger, and its mobility is better.
Embodiment 1
The method of the improvement ceramic core mouldability of the present embodiment is carried out according to following steps:
(1) ceramic core slurry is prepared: according to percentage by weight, by the F220 fused silica powder of 40%, the F600 fused silica powder of 25%, the zircon flour of 30% and 5% the short chopping of quartz glass fibre be placed in ball grinder, the short chopping diameter of quartz glass fibre is 8 μm ~ 10 μm, length 1mm ~ 3mm, ball milling mixes 2 hours, obtains compound; The plasticizer accounting for compound weight 20% is joined in agitator, is heated to 110 DEG C, compound is joined in the plasticizer dissolved, stir 20 hours, obtain ceramic core slurry;
(2) on core press injector, suppress core, ceramic core slurry material feeding temperature is 105 DEG C, and mold temperature is 28 DEG C, Pressure Casting 1Mpa, and pressurize 50s obtains labyrinth ceramic core.
Embodiment 2
The method of the improvement ceramic core mouldability of the present embodiment is carried out according to following steps:
(1) ceramic core slurry is prepared: according to percentage by weight, by the F220 fused silica powder of 45%, the F600 fused silica powder of 22.5%, the zircon flour of 30% and 2.5% the short chopping of quartz glass fibre be placed in ball grinder, the short chopping diameter of quartz glass fibre is 8 μm ~ 10 μm, length 1mm ~ 3mm, ball milling mixes 2.5 hours, obtains compound; The plasticizer accounting for compound weight 22% is joined in agitator, is heated to 120 DEG C, compound is joined in the plasticizer dissolved, stir 24 hours, obtain ceramic core slurry;
(2) on core press injector, suppress core, ceramic core slurry material feeding temperature is 95 DEG C, and mold temperature is 30 DEG C, Pressure Casting 3Mpa, and pressurize 50s obtains labyrinth ceramic core.
Embodiment 3
The method of the improvement ceramic core mouldability of the present embodiment is carried out according to following steps:
(1) ceramic core slurry is prepared: according to percentage by weight, by the F220 fused silica powder of 49.5%, the F600 fused silica powder of 20%, the zircon flour of 30% and 0.5% the short chopping of quartz glass fibre be placed in ball grinder, the short chopping diameter of quartz glass fibre is 8 μm ~ 10 μm, length 1mm ~ 3mm, ball milling mixes 2.5 hours, obtains compound; The plasticizer accounting for compound weight 17% is joined in agitator, is heated to 115 DEG C, compound is joined in the plasticizer dissolved, stir 25 hours, obtain ceramic core slurry;
(2) on core press injector, suppress core, ceramic core slurry material feeding temperature is 100 DEG C, and mold temperature is 25 DEG C, Pressure Casting 2Mpa, and pressurize 50s obtains labyrinth ceramic core.
Embodiment 4
The method of the improvement ceramic core mouldability of the present embodiment is carried out according to following steps:
(1) ceramic core slurry is prepared: according to percentage by weight, by the F220 fused silica powder of 42%, the F600 fused silica powder of 23%, the zircon flour of 30% and 5% the short chopping of quartz glass fibre be placed in ball grinder, the short chopping diameter of quartz glass fibre is 8 μm ~ 10 μm, length 1mm ~ 3mm, ball milling mixes 2 hours, obtains compound; The plasticizer accounting for compound weight 18% is joined in agitator, is heated to 118 DEG C, compound is joined in the plasticizer dissolved, stir 20 hours, obtain ceramic core slurry;
(2) on core press injector, suppress core, ceramic core slurry material feeding temperature is 100 DEG C, and by mould and die preheating to 38 DEG C, Pressure Casting 2Mpa, pressurize 50s, obtain 0.3mm thick exhaust seam ceramic core.
Embodiment 5
The method of the improvement ceramic core mouldability of the present embodiment is carried out according to following steps:
(1) ceramic core slurry is prepared: according to percentage by weight, by the F220 fused silica powder of 40%, the F600 fused silica powder of 28.5%, the zircon flour of 30% and 1.5% the short chopping of quartz glass fibre be placed in ball grinder, the short chopping diameter of quartz glass fibre is 8 μm ~ 10 μm, length 1mm ~ 3mm, ball milling mixes 2.5 hours, obtains compound; The plasticizer accounting for compound weight 20% is joined in agitator, is heated to 120 DEG C, compound is joined in the plasticizer dissolved, stir 20 hours, obtain ceramic core slurry;
(2) on core press injector, suppress core, ceramic core slurry material feeding temperature is 105 DEG C, and by mould and die preheating to 40 DEG C, Pressure Casting 1Mpa, pressurize 50s, obtain 0.3mm thick exhaust seam ceramic core.
Embodiment 6
The method of the improvement ceramic core mouldability of the present embodiment is carried out according to following steps:
(1) ceramic core slurry is prepared: according to percentage by weight, by the F220 fused silica powder of 45%, the F600 fused silica powder of 24%, the zircon flour of 30% and 1% the short chopping of quartz glass fibre be placed in ball grinder, the short chopping diameter of quartz glass fibre is 8 μm ~ 10 μm, length 1mm ~ 3mm, ball milling mixes 2 hours, obtains compound; The plasticizer accounting for compound weight 21% is joined in agitator, is heated to 110 DEG C, compound is joined in the plasticizer dissolved, stir 24 hours, obtain ceramic core slurry;
(2) on core press injector, suppress core, ceramic core slurry material feeding temperature is 95 DEG C, and by mould and die preheating to 42 DEG C, Pressure Casting 3Mpa, pressurize 50s, obtain 0.3mm thick exhaust seam ceramic core.
Claims (2)
1. improve a method for ceramic core mouldability, it is characterized in that carrying out according to following steps:
(1) ceramic core slurry is prepared: according to percentage by weight, by the F220 fused silica powder of 40% ~ 50%, the F600 fused silica powder of 20 ~ 30%, the zircon flour of 30% and 0.5% ~ 5% the short chopping of quartz glass fibre be placed in ball grinder, ball milling mixing 2 ~ 2.5 hours, obtains compound; The plasticizer accounting for compound weight 17% ~ 22% is joined in agitator, is heated to 110 DEG C ~ 120 DEG C, compound is joined in the plasticizer dissolved, stir at least 20 hours, obtain ceramic core slurry;
(2) on core press injector, suppress core, ceramic core slurry material feeding temperature is 95 DEG C ~ 105 DEG C, and mold temperature is 25 DEG C ~ 30 DEG C, and Pressure Casting 1 ~ 3Mpa, pressurize 50s, obtain labyrinth ceramic core; Or by mould and die preheating to 38 DEG C ~ 42 DEG C, Pressure Casting 1 ~ 3Mpa, pressurize 50s, obtain 0.3mm thick exhaust seam ceramic core.
2. a kind of method improving ceramic core mouldability according to claim 1, is characterized in that the short chopping diameter of described quartz glass fibre is 8 μm ~ 10 μm, length 1mm ~ 3mm.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107127302A (en) * | 2017-04-01 | 2017-09-05 | 东风精密铸造安徽有限公司 | A kind of Coremaker skill of moltening mold castings |
| CN109500983A (en) * | 2018-11-23 | 2019-03-22 | 东方电气集团东方汽轮机有限公司 | A kind of cooling mould of ceramic core and biscuit straightening method |
| CN115196981A (en) * | 2022-08-02 | 2022-10-18 | 西北工业大学 | Silica-based ceramic core and preparation method thereof |
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| CN1793012A (en) * | 2005-11-29 | 2006-06-28 | 辽宁省轻工科学研究院 | Ceramic core material by composited inorganic fibre |
| CN102527937A (en) * | 2012-03-15 | 2012-07-04 | 哈尔滨工业大学 | Method for preparing fiber-reinforced thin-wall shell for casting titanium alloy smelting mold |
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| CN102873276A (en) * | 2012-10-24 | 2013-01-16 | 山东理工大学 | Technology for producing casting core |
| CN103170578A (en) * | 2013-03-14 | 2013-06-26 | 山东理工大学 | Ceramic type precise casting method |
| CN104446388A (en) * | 2014-11-10 | 2015-03-25 | 沈阳黎明航空发动机(集团)有限责任公司 | Method of improving liquidity of aluminum oxide mould core slurry |
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2015
- 2015-11-11 CN CN201510764828.9A patent/CN105290335B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1793012A (en) * | 2005-11-29 | 2006-06-28 | 辽宁省轻工科学研究院 | Ceramic core material by composited inorganic fibre |
| CN102527937A (en) * | 2012-03-15 | 2012-07-04 | 哈尔滨工业大学 | Method for preparing fiber-reinforced thin-wall shell for casting titanium alloy smelting mold |
| CN102836962A (en) * | 2012-07-30 | 2012-12-26 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for improving flowability of ceramic core slurry |
| CN102873276A (en) * | 2012-10-24 | 2013-01-16 | 山东理工大学 | Technology for producing casting core |
| CN103170578A (en) * | 2013-03-14 | 2013-06-26 | 山东理工大学 | Ceramic type precise casting method |
| CN104446388A (en) * | 2014-11-10 | 2015-03-25 | 沈阳黎明航空发动机(集团)有限责任公司 | Method of improving liquidity of aluminum oxide mould core slurry |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107127302A (en) * | 2017-04-01 | 2017-09-05 | 东风精密铸造安徽有限公司 | A kind of Coremaker skill of moltening mold castings |
| CN109500983A (en) * | 2018-11-23 | 2019-03-22 | 东方电气集团东方汽轮机有限公司 | A kind of cooling mould of ceramic core and biscuit straightening method |
| CN115196981A (en) * | 2022-08-02 | 2022-10-18 | 西北工业大学 | Silica-based ceramic core and preparation method thereof |
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| CN105290335B (en) | 2018-07-31 |
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Address after: 110043 Dong TA street, Dadong District, Shenyang, Liaoning Province, No. 6 Patentee after: Chinese Hangfa Shenyang Liming Aero engine limited liability company Address before: 110043 Dong TA street, Dadong District, Shenyang, Liaoning Province, No. 6 Patentee before: Liming Aeroplane Engine (Group) Co., Ltd., Shenyang City |