CN104649685B - A kind of ceramic core injection moulding plasticizer and preparation method thereof - Google Patents
A kind of ceramic core injection moulding plasticizer and preparation method thereof Download PDFInfo
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- CN104649685B CN104649685B CN201310586003.3A CN201310586003A CN104649685B CN 104649685 B CN104649685 B CN 104649685B CN 201310586003 A CN201310586003 A CN 201310586003A CN 104649685 B CN104649685 B CN 104649685B
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- plasticizer
- ceramic core
- injection moulding
- core injection
- vinyl acetate
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Abstract
It is an object of the invention to provide a kind of new ceramic core shaping plasticizer, to meet that complicated inner cavity structure single crystal turbine blade ceramic core prepares the needs of high, it is characterised in that：The composition and composition proportion of the plasticizer are mass percent：Rosin 1 5%, stearic acid 1 5%, ethylene-vinyl acetate copolymer 1 5%, paraffin surplus.
Description
Technical field
The invention belongs to ceramic powder field shaping technique, more particularly to labyrinth ceramic core plasticizer and its preparation
Technique.
Background technology
The hot-end component of aero-engine most critical is turbo blade, in order to improve the thermal efficiency, in now all of combustion gas
Air cooling structure is all used in turbine blade.The height of air cooling effect has substantial connection with the air cooling structure of blade, is
Higher gas cooling effect is pursued, the hollow-core construction of blade also becomes increasingly complex.Complicated hollow-core construction uses ceramic core
To be formed.Ceramic Core for Hollow Blades due to the complexity of structure cause its when ceramic powder is molded be very easy to fracture or
Various defects are formed in sintering process so that the qualification rate of ceramic core is greatly lowered, production cost also greatly improves.Cause
This, how to solve labyrinth ceramic core formation problems is urgent problem in production.
The effect of plasticizer is to assign the loose ceramic powder of drying to certain mobility in a heated state, so as to
Ceramic core can smoothly be full of the die cavity of die mould in process of injection molding, and there is core certain wet strength to ensure ceramics
Core biscuit can carry and certain non-deformability.In addition, plasticizer is melted when core sinters and inhaled by filler
Receive, can all volatilize during high-temperature roasting, not leave or seldom leave residual impurity, do not change the composition of core material.Therefore
Plasticizer is asked to have relatively low fusing point, the hardness that viscosity is suitable, heat endurance is good, enough, intensity and toughness, any surface finish
The features such as degree height and low-residual.
Currently used plasticizer is two or more mixtures of paraffin, beeswax, polyethylene, rosin and stearic acid etc..
The temperature in use of this kind of plasticizer is generally 100 DEG C -130 DEG C, and its room-temperature property is typically relatively low, ceramic core biscuit shrink compared with
Greatly, cracking, core poor dimensional stability are easily deformed, therefore new plasticizer need to be developed to meet that complicated ceramic core is molded
Demand.
The content of the invention
It is an object of the invention to provide a kind of new ceramic core shaping plasticizer, to meet complicated inner cavity structure list
Brilliant turbo blade ceramic core prepares high demand.
The present invention specifically provides a kind of ceramic core injection moulding plasticizer, it is characterised in that：The plasticizer
Composition and composition proportion are（Mass percent）：
Rosin of the present invention is preferably 424 rosin or newtrex, in ethylene-vinyl acetate copolymer, vinyl acetate
The content of copolymer is preferably 10-40wt%, and stearic purity requirement is more than 99.9%.
Ceramic core injection moulding plasticizer of the present invention, it is characterised in that：The composition and composition of the plasticizer
Proportioning is most preferably（Mass percent）：
Present invention also offers the preparation method of the ceramic core injection moulding plasticizer, it is characterised in that specific
Process route is：
First by melted paraffin wax, rosin is then added, is stirred, is added stearic acid until completely dissolved, be kept stirring for, is treated hard
Resin acid stirs all after dissolving, then add ethylene-vinyl acetate copolymer, after ethylene-vinyl acetate copolymer completion is clear,
Bulk is poured into, plasticizer is made.
The preparation method of ceramic core injection moulding plasticizer of the present invention, it is characterised in that：Paraffin melting point is 56
DEG C -62 DEG C, fusion temperature need to be controlled between 80 DEG C -100 DEG C.
The preparation method of ceramic core injection moulding plasticizer of the present invention, it is characterised in that：Add ethyl vinyl acetate
The mixing time of mixture is preferably 8-16 hours after ethylene copolymer, and mixing speed is 30-100 revs/min.
The present invention adds a certain amount of stearic acid to increase surface-active, makes plasticizer using industrial paraffin refined wax as matrix material
It can be well mixed between ceramic powder, add a certain amount of ethylene-vinyl acetate copolymer（EVA）The intensity of increase paraffin,
Hardness and toughness, a certain amount of rosin is added to improve mechanical property and chemical stability.
Brief description of the drawings
Fig. 1 uses ceramic core biscuit prepared by the plasticizer of embodiment 1；
Fig. 2 uses ceramic core prepared by the plasticizer of embodiment 1；
Fig. 3 uses ceramic core biscuit prepared by the plasticizer of embodiment 2；
Fig. 4 uses ceramic core prepared by the plasticizer of embodiment 2.
Embodiment
Stearic purity is more than 99.9% used in the present embodiment.
Embodiment 1
Plasticizer raw material proportioning is（Mass percent）：
Using oil bath heating stove heat paraffin, heating-up temperature is 90 DEG C, and newtrex, Bian Jia are added after its all fusing
Enter side stirring, stearic acid particles are added after its complete dissolved clarification（Stearic purity is more than 99.9% used in the present invention）, side
Side stirring is added, ethylene-vinyl acetate copolymer is added again after hard granulates all fusing（Acetate ethylene copolymer contains
Measure as 28wt%）Continue to stir, mixing time is 8 hours, and mixing speed is 100 revs/min, and liquid pours into after integrally becoming clear
Fritter is standby.
Plasticizer is melted, fusion temperature is controlled at 100 DEG C, is gradually added into the hot powder of silica, and side adds ceramic powder
Expect side stirring, mixing time 8 hours；After plasticizer, powder are well mixed, temperature is maintained between 90 DEG C -100 DEG C, is made
Uniform ceramic powder slurry.
Ceramic slurry shaping is molded using injection molding mode, and temperature is 100 DEG C, and injection moulding pressure is 0.7MPa；
Obtained ceramic core biscuit is shown in Fig. 1.
After ceramic core shaping, the plasticizer in core is removed using filling method, and filler uses alundum (Al2O3) powder,
Granularity is the industrial alumina powder of 200 mesh；It is 1190 DEG C to burn temperature eventually, and 5 hours time, obtained ceramic core is shown in Fig. 2.
The ceramic core biscuit density uniformity prepared using the formula plasticizer is good, and Density Distribution is uniform, and error is less than
2%, base substrate room temperature strength is less than 0.2% up to more than 28MPa, base substrate dimensional contraction rate.
Embodiment 2：
Plasticizer raw material proportioning is（Mass percent）：
Using oil bath heating stove heat paraffin, heating-up temperature is 90 DEG C, and newtrex, Bian Jia are added after its all fusing
Enter side stirring, add stearic acid particles after its complete dissolved clarification, stir while adding, add again after hard granulates all fusing
Add ethylene-vinyl acetate copolymer（The content of acetate ethylene copolymer is 40wt%）Continuing to stir, mixing time is 16 hours,
Mixing speed is 80 revs/min, and it is standby that liquid pours into fritter after integrally becoming clear.
Plasticizer is melted, fusion temperature is controlled at 100 DEG C, is gradually added into the hot powder of aluminum oxide+silica, and side adds
Ceramic powder side is stirred, mixing time 8 hours；After plasticizer, powder are well mixed, temperature be maintained at 90 DEG C -100 DEG C it
Between, uniform ceramic powder slurry is made.
Ceramic slurry shaping is molded using injection molding mode, and temperature is 100 DEG C, and injection moulding pressure is 0.7MPa；
Obtained ceramic core biscuit is shown in Fig. 3.
After ceramic core shaping, the plasticizer in core is removed using filling method, and filler uses alundum (Al2O3) powder,
Granularity is the industrial alumina powder of 200 mesh；It is 1190 DEG C to burn temperature eventually, and 5 hours time, obtained ceramic core is shown in Fig. 4.
The ceramic core biscuit density uniformity prepared using the formula plasticizer is good, and Density Distribution is uniform, and error is less than
1.2%, base substrate room temperature strength is less than 0.4% up to more than 21MPa, base substrate dimensional contraction rate.
Embodiment 3：
Plasticizer raw material proportioning is（Mass percent）：
Using oil bath heating stove heat paraffin, heating-up temperature is 90 DEG C, and newtrex, Bian Jia are added after its all fusing
Enter side stirring, add stearic acid particles after its complete dissolved clarification, stir while adding, add again after hard granulates all fusing
Add ethylene-vinyl acetate copolymer（The content of acetate ethylene copolymer is 20wt%）Continuing to stir, mixing time is 16 hours,
Mixing speed is 100 revs/min, and it is standby that liquid pours into fritter after integrally becoming clear.
Plasticizer is melted, fusion temperature is controlled at 100 DEG C, is gradually added into the hot powder of aluminum oxide+silica, and side adds
Ceramic powder side is stirred, mixing time 8 hours；After plasticizer, powder are well mixed, temperature be maintained at 90 DEG C -100 DEG C it
Between, uniform ceramic powder slurry is made.
Ceramic slurry shaping is molded using injection molding mode, and temperature is 95 DEG C, and injection moulding pressure is 0.7MPa；Pottery
After porcelain core moulding, the plasticizer in core is removed using filling method, and filler uses alundum (Al2O3) powder, granularity 200
The industrial alumina powder of mesh；It is 1210 DEG C to burn temperature eventually, 6 hours time, ceramic core is made.
The ceramic core biscuit density uniformity prepared using the formula plasticizer is good, and Density Distribution is uniform, and error is less than
1.3%, base substrate room temperature strength is less than 0.3% up to more than 25MPa, base substrate dimensional contraction rate.
Embodiment 4：
Plasticizer raw material proportioning is（Mass percent）：
Using oil bath heating stove heat paraffin, heating-up temperature is 90 DEG C, and newtrex, Bian Jia are added after its all fusing
Enter side stirring, add stearic acid particles after its complete dissolved clarification, stir while adding, add again after hard granulates all fusing
Add ethylene-vinyl acetate copolymer（The content of acetate ethylene copolymer is 10wt%）Continuing to stir, mixing time is 16 hours,
Mixing speed is 100 revs/min, and it is standby that liquid pours into fritter after integrally becoming clear.
Plasticizer is melted, fusion temperature is controlled at 100 DEG C, is gradually added into the hot powder of aluminum oxide+silica, and side adds
Ceramic powder side is stirred, mixing time 8 hours；After plasticizer, powder are well mixed, temperature be maintained at 90 DEG C -100 DEG C it
Between, uniform ceramic powder slurry is made.
Ceramic slurry shaping is molded using injection molding mode, and temperature is 95 DEG C, and injection moulding pressure is 0.7MPa；Pottery
After porcelain core moulding, the plasticizer in core is removed using filling method, and filler uses alundum (Al2O3) powder, granularity 200
The industrial alumina powder of mesh；It is 1210 DEG C to burn temperature eventually, 6 hours time, ceramic core is made.
The ceramic core biscuit density uniformity prepared using the formula plasticizer is good, and Density Distribution is uniform, and error is less than
1%, base substrate room temperature strength is less than 0.6% up to more than 20MPa, base substrate size distortion rate.
Embodiment 5
Plasticizer raw material proportioning is（Mass percent）：
Using oil bath heating stove heat paraffin, heating-up temperature is 90 DEG C, and newtrex, Bian Jia are added after its all fusing
Enter side stirring, add stearic acid particles after its complete dissolved clarification, stir while adding, add again after hard granulates all fusing
Add ethylene-vinyl acetate copolymer（The content of acetate ethylene copolymer is 25wt%）Continuing to stir, mixing time is 16 hours,
Mixing speed is 100 revs/min, and it is standby that liquid pours into fritter after integrally becoming clear.
Plasticizer is melted, fusion temperature is controlled at 100 DEG C, is gradually added into the hot powder of aluminum oxide+silica, and side adds
Ceramic powder side is stirred, mixing time 8 hours；After plasticizer, powder are well mixed, temperature be maintained at 90 DEG C -100 DEG C it
Between, uniform ceramic powder slurry is made.
Ceramic slurry shaping is molded using injection molding mode, and temperature is 95 DEG C, and injection moulding pressure is 0.7MPa；Pottery
After porcelain core moulding, the plasticizer in core is removed using filling method, and filler uses alundum (Al2O3) powder, granularity 200
The industrial alumina powder of mesh；It is 1210 DEG C to burn temperature eventually, 6 hours time, ceramic core is made.
The ceramic core biscuit density uniformity prepared using the formula plasticizer is good, and Density Distribution uniform error is less than
1.2%, base substrate room temperature strength is less than 0.3% up to more than 25MPa, base substrate size distortion rate.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar can understand present disclosure and implement according to this, and it is not intended to limit the scope of the present invention.It is all according to the present invention
The equivalent change or modification that Spirit Essence is made, it should all be included within the scope of the present invention.
Claims (8)
- A kind of 1. ceramic core injection moulding plasticizer, it is characterised in that：The composition and composition proportion of the plasticizer are matter Measure percentage：
- 2. according to ceramic core injection moulding plasticizer described in claim 1, it is characterised in that：The rosin is 424 rosin Or newtrex.
- 3. according to the ceramic core injection moulding plasticizer of claim 1 or 2, it is characterised in that：The ethyl vinyl acetate second In alkene copolymer, the content of acetate ethylene copolymer is 10-40wt%.
- 4. according to the ceramic core injection moulding plasticizer of claim 1 or 2, it is characterised in that：It is described stearic pure Degree is more than 99.9%.
- 5. according to the ceramic core injection moulding plasticizer of claim 1 or 2, it is characterised in that：The plasticizer into Divide and composition proportion is mass percent：
- A kind of 6. preparation method of ceramic core injection moulding plasticizer described in claim 1, it is characterised in that concrete technology Route is：First by technical pure melted paraffin wax, rosin is then added, is stirred, is added stearic acid until completely dissolved, be kept stirring for, treat Stearic acid stirs all after dissolving, then add ethylene-vinyl acetate copolymer, and ethylene-vinyl acetate copolymer completion is clear Afterwards, bulk is poured into, plasticizer is made.
- 7. according to the preparation method of ceramic core injection moulding plasticizer described in claim 6, it is characterised in that：Technical pure stone Wax fusing point is 56 DEG C -62 DEG C, and fusion temperature is controlled between 80 DEG C -100 DEG C.
- 8. according to the preparation method of the ceramic core injection moulding plasticizer of claim 6 or 7, it is characterised in that：Addition The mixing time of mixture is 8-16 hours after ethylene-vinyl acetate copolymer, and mixing speed is 30-100 revs/min.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101429023A (en) * | 2008-12-05 | 2009-05-13 | 辽宁省轻工科学研究院特铸材料有限公司 | Compound zirconia ceramics core material employing inorfil |
| CN102603275A (en) * | 2012-02-09 | 2012-07-25 | 北京昌航精铸技术有限公司 | Preparation method of silicon-based ceramic core |
| CN103242036A (en) * | 2012-02-14 | 2013-08-14 | 中国科学院金属研究所 | Method for preparing composite ceramic core |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101429023A (en) * | 2008-12-05 | 2009-05-13 | 辽宁省轻工科学研究院特铸材料有限公司 | Compound zirconia ceramics core material employing inorfil |
| CN102603275A (en) * | 2012-02-09 | 2012-07-25 | 北京昌航精铸技术有限公司 | Preparation method of silicon-based ceramic core |
| CN103242036A (en) * | 2012-02-14 | 2013-08-14 | 中国科学院金属研究所 | Method for preparing composite ceramic core |
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