CN107010983A - Enhanced ceramic core of a kind of mullite fiber and preparation method thereof - Google Patents

Enhanced ceramic core of a kind of mullite fiber and preparation method thereof Download PDF

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Publication number
CN107010983A
CN107010983A CN201710321174.1A CN201710321174A CN107010983A CN 107010983 A CN107010983 A CN 107010983A CN 201710321174 A CN201710321174 A CN 201710321174A CN 107010983 A CN107010983 A CN 107010983A
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ceramic core
mullite fiber
powder
sio
enhanced
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梁康硕
刘玉柱
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Shenyang Ming He Quartz Ware Co Ltd
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Shenyang Ming He Quartz Ware Co Ltd
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Abstract

The present invention provides enhanced ceramic core of a kind of mullite fiber and preparation method thereof, and the ceramic core is according to the chemical composition of percentage by weight：SiO2Powder 48 ~ 57%, ZrO2Powder 23 ~ 33%, mullite fiber 6 ~ 10%, binding agent 8 ~ 17%.Preparation method includes（1）According to above-mentioned percent mass proportioning, by SiO2Powder, ZrO2Powder, mullite fiber and bonding agent are mixed, heating stirring, form slurry；（2）Ceramic core mould is preheated, slurry is poured into pressure injection is carried out in ceramic core mould, ceramic core idiosome of different shapes is formed according to mould；（3）Ceramic core idiosome is put into kiln furnitures and Al is filled up2O3Filler, kiln high temperature is calcined；（4）The ceramic core idiosome for being calcined completion is put into forced fluid and soaks and dries, the enhanced ceramic core of the mullite fiber is obtained.

Description

Enhanced ceramic core of a kind of mullite fiber and preparation method thereof
Technical field
The present invention relates to a kind of ceramic core and preparation method thereof, and in particular to a kind of enhanced ceramic mould of mullite fiber Core and preparation method thereof.
Background technology
Ceramic core is the adaptor for manufacturing model casting hollow casting, and it is the inner chamber shape to form hollow casting that it, which is acted on, Shape, and with the dimensional accuracy of shell common guarantee casting section thickness.As model casting is towards the side of " precision, thin-walled, without surplus " To development, the performance and Engineering Reliability Challenge of ceramic core.And ceramic core prepared by prior art in casting and The phenomenon of core fracture often occurs during casting of metals, especially in the high-tech essence such as single crystal casting and equiax crystal casting During close, how to ensure the strength problem of the relatively thin ceramic core of size, be still worth further research.
The content of the invention
The problem of existing for prior art, the present invention provides a kind of enhanced ceramic core of mullite fiber and its preparation Method.The technical scheme is that：
A kind of enhanced ceramic core of mullite fiber, be according to the chemical composition of percentage by weight：SiO2Powder 48 ~ 57%, ZrO2Powder 23 ~ 33%, mullite fiber 6 ~ 10%, binding agent 8 ~ 17%.
Further, the SiO2In powder, granularity is the SiO of 220 mesh2Powder accounts for 60 ~ 67.3%, and granularity is 300 purposes SiO2Powder accounts for 32.7 ~ 40%.
Further, the ZrO2The granularity of powder is 300 mesh.
Further, a diameter of 2 ~ 10 μm of the mullite fiber, length is 0.075 ~ 0.3mm.
Further, the binding agent mixes for the one or more in paraffin, beeswax, polyethylene, polyvinyl alcohol and EVA Close.
The preparation method of the ceramic core, including：
（1）According to above-mentioned percent mass proportioning, by SiO2Powder, ZrO2Powder, mullite fiber and bonding agent are mixed, and heating is stirred Mix, form slurry；
（2）Ceramic core mould is preheated, slurry is poured into pressure injection is carried out in ceramic core mould, not similar shape is formed according to mould The ceramic core idiosome of shape；
（3）Ceramic core idiosome is put into kiln furnitures and Al is filled up2O3Filler, kiln high temperature is calcined；
（4）The ceramic core idiosome for being calcined completion is put into forced fluid and soaks and dries, the mullite fiber enhancing is obtained Ceramic core.
In the above method, the step（1）Heating-up temperature be 110 ~ 130 DEG C, mixing time be 2 ~ 5h.
In the above method, the step（2）Ceramic core mold preheating temperature be 30~50 DEG C, pressure injection condition is：Close 5 ~ 6MPa of film pressure, 1 ~ 3Mpa of grouting pressure, 20 ~ 30s of slip casting time, 15 ~ 30s of dwell time.
In the above method, the step（3）High-temperature roasting condition be：Prior to 200 ~ 250 DEG C roastings 2~5h, Ran Houyu 400 ~ 450 DEG C of 3~6h of roasting, then at 850 ~ 900 DEG C of 3~5h of insulation, are most calcined 7~8h after 1190~1250 DEG C.
The features of the present invention and beneficial effect：The present invention introduces mullite fiber to strengthen ceramic mould in ceramic core Core, the dial-out from matrix in fracture process due to mullite fiber, can significantly improve the intensity of ceramic core and be broken tough Property, improve the mechanical property of ceramic core.
Embodiment
The present invention is described in further details with reference to specific embodiment, it is described be explanation of the invention without It is to limit.
Embodiment 1
A kind of enhanced ceramic core of mullite fiber, be according to the chemical composition of percentage by weight：Granularity is the SiO of 220 mesh2 Powder 35%, granularity is the SiO of 300 mesh2Powder 18%, granularity is the ZrO of 300 mesh2Powder 26%, length is the mullite of 180 mesh Fiber 7%, binding agent 14%.Wherein binding agent is paraffin, beeswax, polyethylene mixing.
The preparation method of the ceramic core, including：
（1）According to above-mentioned percent mass proportioning, by SiO2Powder, ZrO2Powder, mullite fiber and bonding agent are mixed, in 110 DEG C heating stirring 3h, forms slurry；
（2）Ceramic core mould is preheated to 35 DEG C, slurry is poured into pressure injection is carried out in ceramic core mould, pressure injection condition is： Film pressure 6MPa, grouting pressure 3Mpa, slip casting time 20s, dwell time 15s are closed in control；Form of different shapes according to mould Ceramic core idiosome；
（3）Ceramic core idiosome is put into kiln furnitures and Al is filled up2O3Filler, keeps filler plain, kiln furnitures is put into high temperature furnace Middle roasting, prior to 250 DEG C roasting 3h, is then calcined 4h in 400 DEG C, then at 850 DEG C of insulation 4h, is most calcined 8h after 1250 DEG C；
（4）The ceramic core idiosome for being calcined completion is taken out from kiln furnitures, surface quick sand is cleared up, is put into Ludox forced fluid and soaks 2.5h is steeped, 60 DEG C of drying obtain the enhanced ceramic core of the mullite fiber.
The ceramic core room temperature strength strengthened without mullite fiber is 10.5MPa, and intensity is at a high temperature of 1475 DEG C 8.3MPa, the porosity is 29.44%.Ceramic core room temperature strength after the strengthening through mullite fiber of the present embodiment is 18MPa, Intensity is 12MPa at a high temperature of 1475 DEG C, and the porosity is minimum.
Embodiment 2
A kind of enhanced ceramic core of mullite fiber, be according to the chemical composition of percentage by weight：Granularity is the SiO of 220 mesh2 Powder 30%, granularity is the SiO of 300 mesh2Powder 20%, granularity is the ZrO of 300 mesh2Powder 23%, length is the mullite of 220 mesh Fiber 10%, binding agent 17%.Wherein binding agent is paraffin, beeswax, polyvinyl alcohol.
The preparation method of the ceramic core, including：
（1）According to above-mentioned percent mass proportioning, by SiO2Powder, ZrO2Powder, mullite fiber and bonding agent are mixed, in 130 DEG C heating stirring 2h, forms slurry；
（2）Ceramic core mould is preheated to 50 DEG C, slurry is poured into pressure injection is carried out in ceramic core mould, pressure injection condition is： Film pressure 5MPa, grouting pressure 2Mpa, slip casting time 30s, dwell time 20s are closed in control；Form of different shapes according to mould Ceramic core idiosome；
（3）Ceramic core idiosome is put into kiln furnitures and Al is filled up2O3Filler, keeps filler plain, kiln furnitures is put into high temperature furnace Middle roasting, prior to 200 DEG C roasting 5h, is then calcined 3h in 450 DEG C, then at 900 DEG C of insulation 3h, is most calcined 8h after 1190 DEG C；
（4）The ceramic core idiosome for being calcined completion is taken out from kiln furnitures, surface quick sand is cleared up, is put into Ludox forced fluid and soaks 2h is steeped, 50 DEG C of drying obtain the enhanced ceramic core of the mullite fiber.
The ceramic core room temperature strength strengthened without mullite fiber is 10.5MPa, and intensity is at a high temperature of 1475 DEG C 8.3MPa, the porosity is 29.44%.Ceramic core room temperature strength after the strengthening through mullite fiber of the present embodiment is 18MPa, Intensity is 12MPa at a high temperature of 1475 DEG C, and the porosity is minimum.
Embodiment 3
A kind of enhanced ceramic core of mullite fiber, be according to the chemical composition of percentage by weight：Granularity is the SiO of 220 mesh2 Powder 37%, granularity is the SiO of 300 mesh2Powder 18%, granularity is the ZrO of 300 mesh2Powder 31%, length is the mullite of 400 mesh Fiber 6%, binding agent 8%.Wherein binding agent is paraffin, beeswax, EVA mixing.
The preparation method of the ceramic core, including：
（1）According to above-mentioned percent mass proportioning, by SiO2Powder, ZrO2Powder, mullite fiber and bonding agent are mixed, in 110 DEG C heating stirring 5h, forms slurry；
（2）Ceramic core mould is preheated to 30 DEG C, slurry is poured into pressure injection is carried out in ceramic core mould, pressure injection condition is： Film pressure 5MPa, grouting pressure 1Mpa, slip casting time 30s, dwell time 30s are closed in control；Form of different shapes according to mould Ceramic core idiosome；
（3）Ceramic core idiosome is put into kiln furnitures and Al is filled up2O3Filler, keeps filler plain, kiln furnitures is put into high temperature furnace Middle roasting, prior to 250 DEG C roasting 4h, is then calcined 5h in 400 DEG C, then at 850 DEG C of insulation 5h, is most calcined 7h after 1200 DEG C；
（4）The ceramic core idiosome for being calcined completion is taken out from kiln furnitures, surface quick sand is cleared up, is put into Ludox forced fluid and soaks 3h is steeped, 65 DEG C of drying obtain the enhanced ceramic core of the mullite fiber.
The ceramic core room temperature strength strengthened without mullite fiber is 10.5MPa, and intensity is at a high temperature of 1475 DEG C 8.3MPa, the porosity is 29.44%.Ceramic core room temperature strength after the strengthening through mullite fiber of the present embodiment is 18MPa, Intensity is 12MPa at a high temperature of 1475 DEG C, and the porosity is minimum.
Embodiment 4
A kind of enhanced ceramic core of mullite fiber, be according to the chemical composition of percentage by weight：Granularity is the SiO of 220 mesh2 Powder 32%, granularity is the SiO of 300 mesh2Powder 19%, granularity is the ZrO of 300 mesh2Powder 29%, length is the mullite of 325 mesh Fiber 8%, binding agent 12%.Wherein binding agent is paraffin, beeswax mixing.
The preparation method of the ceramic core, including：
（1）According to above-mentioned percent mass proportioning, by SiO2Powder, ZrO2Powder, mullite fiber and bonding agent are mixed, in 115 DEG C heating stirring 3.5h, forms slurry；
（2）Ceramic core mould is preheated to 42 DEG C, slurry is poured into pressure injection is carried out in ceramic core mould, pressure injection condition is： Film pressure 6MPa, grouting pressure 3Mpa, slip casting time 20s, dwell time 15s are closed in control；Form of different shapes according to mould Ceramic core idiosome；
（3）Ceramic core idiosome is put into kiln furnitures and Al is filled up2O3Filler, keeps filler plain, kiln furnitures is put into high temperature furnace Middle roasting, prior to 250 DEG C roasting 2.9h, is then calcined 3.7h in 450 DEG C, then at 850 DEG C of insulation 4.2h, most after 1235 DEG C of roastings Burn 7h；
（4）The ceramic core idiosome for being calcined completion is taken out from kiln furnitures, surface quick sand is cleared up, is put into Ludox forced fluid and soaks 2.6h is steeped, 68 DEG C of drying obtain the enhanced ceramic core of the mullite fiber.
The ceramic core room temperature strength strengthened without mullite fiber is 10.5MPa, and intensity is at a high temperature of 1475 DEG C 8.3MPa, the porosity is 29.44%.Ceramic core room temperature strength after the strengthening through mullite fiber of the present embodiment is 18MPa, Intensity is 12MPa at a high temperature of 1475 DEG C, and the porosity is minimum.
Finally it should be noted that：The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent The present invention is described in detail with reference to above-described embodiment for pipe, those of ordinary skills in the art should understand that：Still may be used Modified or equivalent substitution, and repaiied without departing from present inventive concept and any of scope with the embodiment to the present invention Change or equivalent substitution, it all should cover among present claims scope.

Claims (9)

1. the enhanced ceramic core of a kind of mullite fiber, it is characterised in that be according to the chemical composition of percentage by weight：SiO2Powder 48 ~ 57%, ZrO of end2Powder 23 ~ 33%, mullite fiber 6 ~ 10%, binding agent 8 ~ 17%.
2. a kind of enhanced ceramic core of mullite fiber according to claim 1, it is characterised in that the SiO2Powder In, granularity is the SiO of 220 mesh2Powder accounts for 60 ~ 67.3%, and granularity is the SiO of 300 mesh2Powder accounts for 32.7 ~ 40%.
3. a kind of enhanced ceramic core of mullite fiber according to claim 1, it is characterised in that the ZrO2Powder Granularity is 300 mesh.
4. the enhanced ceramic core of a kind of mullite fiber according to claim 1, it is characterised in that the mullite is fine A diameter of 2 ~ 10 μm are tieed up, length is 0.075 ~ 0.3mm.
5. a kind of enhanced ceramic core of mullite fiber according to claim 1, it is characterised in that the binding agent is One or more mixing in paraffin, beeswax, polyethylene, polyvinyl alcohol and EVA.
6. a kind of preparation method of the enhanced ceramic core of mullite fiber described in claim 1, it is characterised in that including：
（1）According to above-mentioned percent mass proportioning, by SiO2Powder, ZrO2Powder, mullite fiber and bonding agent are mixed, and heating is stirred Mix, form slurry；
（2）Ceramic core mould is preheated, slurry is poured into pressure injection is carried out in ceramic core mould, not similar shape is formed according to mould The ceramic core idiosome of shape；
（3）Ceramic core idiosome is put into kiln furnitures and Al is filled up2O3Filler, kiln high temperature is calcined；
（4）The ceramic core idiosome for being calcined completion is put into forced fluid and soaks and dries, the mullite fiber enhancing is obtained Ceramic core.
7. a kind of preparation method of the enhanced ceramic core of mullite fiber according to claim 6, it is characterised in that institute State step（1）Heating-up temperature be 110 ~ 130 DEG C, mixing time be 2 ~ 5h.
8. a kind of preparation method of the enhanced ceramic core of mullite fiber according to claim 6, it is characterised in that institute State step（2）Ceramic core mold preheating temperature be 30~50 DEG C, pressure injection condition is：Close 5 ~ 6MPa of film pressure, grouting pressure 1 ~ 3Mpa, 20 ~ 30s of slip casting time, 15 ~ 30s of dwell time.
9. a kind of preparation method of the enhanced ceramic core of mullite fiber according to claim 6, it is characterised in that institute State step（3）High-temperature roasting condition be：Prior to 200 ~ 250 DEG C 2~5h of roasting, are then calcined 3~6h in 400 ~ 450 DEG C, then 3~5h is incubated in 850 ~ 900 DEG C, most 7~8h is calcined after 1190~1250 DEG C.
CN201710321174.1A 2017-05-09 2017-05-09 Enhanced ceramic core of a kind of mullite fiber and preparation method thereof Pending CN107010983A (en)

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