CN104923729A - Manufacturing method of composite shell of large diffuser precision casting - Google Patents
Manufacturing method of composite shell of large diffuser precision casting Download PDFInfo
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- CN104923729A CN104923729A CN201510353449.0A CN201510353449A CN104923729A CN 104923729 A CN104923729 A CN 104923729A CN 201510353449 A CN201510353449 A CN 201510353449A CN 104923729 A CN104923729 A CN 104923729A
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Abstract
The invention belongs to a precision casting technology, and relates to a manufacturing method of a composite shell of a large diffuser precision casting. The manufacturing method of the composite shell of the large diffuser precision casting is characterized by comprising the following steps of smearing investment precoat; smearing a transition layer coating; smearing a heat-insulation layer coating; smearing a reinforcement layer coating; and smearing a seal layer coating. By the manufacturing method of the composite shell of the large diffuser precision casting, collapsibility of the shell is improved, and the difficulty of unshelling is reduced; and the heat-insulation performance of the shell is improved, shortcomings of undercasting and loosening of the casting are avoided, and the yield of the casting is improved.
Description
Technical field
The invention belongs to precision casting technology, relate to a kind of manufacture method of large-scale diffuser precision castings composite shell.
Background technology
Large-scale is one of crucial hot-end component in aero-engine without surplus diffuser precision castings, the blade that structure is not generally waited by quantity is formed by connecting by inner and outer ring, general employing disposable whole type casting moulding, maximum gauge is usually at more than φ 500mm, wall thickness great disparity, heat energy-saving position is more, and foundry goods easily produces owes casting and loose metallurgical imperfection, and its shell technology processed is one of key technology of such large-scale diffuser precision castings.The surface layer of existing shell side method processed adopts Ludox bonding agent coating, and backing layer all adopts silicate hydrolyzate liquid bonding agent coating, and such casting weight is generally heavier, and for ensureing that shell has certain intensity, the paint case making number of plies is generally more than 11 layers, and shell is thicker.Shell obtained by this shell side method processed has two deficiencies: the first, and because shell is thicker, obtained shell collapsibility is bad, not easily shells after casting pouring; Second, because casting weight is heavier, casting structure more complicated, the pouring metal melt time is longer, and the flowing time in shell is longer, at the position that molten metal finally flows to, because molten metal temperature declines, cause foundry goods can not effectively filling, easily produce and owe to cast and rarefaction defect, cause and overproofly even to scrap, casting qualified rate is low.
Summary of the invention
The object of the invention is: the manufacture method proposing a kind of large-scale diffuser precision castings composite shell, to improve the collapsibility of shell, reduce the difficulty of shelling; Increase the heat-insulating property of shell, stop deficient casting and the rarefaction defect of foundry goods, improve the qualification rate of foundry goods.
Technical scheme of the present invention is: a kind of manufacture method of large-scale diffuser precision castings composite shell, is characterized in that, the step manufacturing composite shell is as follows:
1, coat investment precoat: investment precoat bonding agent is Ludox, refractory material is 325 object zirconium English powder, and surface refiner is cobalt aluminate, and defoamer is n-octyl alcohol, and wetting agent is bleeding agent " T "; Surface layer slip proportioning is: every 1 liter of Ludox, adds wetting agent 5 milliliters, adds defoamer 10 milliliters, adds zirconium English powder 3.68Kg, adds cobalt aluminate 0.32Kg; Slip proportion after preparing is 2.65g/cm
3~ 2.95g/cm
3; Surface layer stucco granularity is 70 object emergies.The wax-pattern assembly natural drying at least 12h making investment precoat will be coated with;
2, transition zone coating is coated: the number of plies of transition zone coating is 2 layers ~ 5 layers; Transition zone coating bonding agent is silicate hydrolyzate liquid, and silicate hydrolyzate liquid dioxide-containing silica is 20%, and refractory material is upper shop powder, and the granularity of upper shop powder is 270 orders, and analyzing pure is hydrochloric acid; Transition zone slip proportioning is: every 1Kg silicate hydrolyzate liquid, adds shop powder 2.6Kg, add hydrochloric acid 5 milliliters; Slip proportion after preparing is 1.72g/cm
3~ 1.85g/cm
3, pH value is 2 ~ 3; Transition zone stucco granularity is shop sand in 36 order ~ 24 objects.Often be coated with after making one deck transition zone coating, be placed into by wax-pattern assembly in the ammonia case with air exhauster, advanced sector-style is done, and after air-dry at least 20min, closes the chamber door of ammonia case, passes into ammonia and carry out ammonia drying, and ammonia drying time is 10min; Then close ammonia, open air exhauster exhausting at least 20min.
3, heat-insulation layer coating is coated: the number of plies of heat-insulation layer coating is 2 layers ~ 4 layers; Heat-insulation layer coating bonding agent is latex and silicate hydrolyzate liquid, and refractory material is upper shop powder, and the granularity of upper shop powder is 270 orders, and analyzing pure is alcohol and hydrochloric acid; Heat-insulation layer slip proportioning is: every 20Kg silicate hydrolyzate liquid, adds latex 3.26Kg, add alcohol 5000 milliliters, add hydrochloric acid 100 milliliters, add shop powder 34Kg ~ 38Kg; Slip proportion after preparing is 1.6g/cm
3~ 1.71g/cm
3, pH value is 2 ~ 3; Heat-insulation layer stucco granularity is shop sand in 36 order ~ 24 objects.Often be coated with after making one layer of heat preservation coating, be placed into by wax-pattern assembly in the ammonia case with air exhauster, advanced sector-style is done, and after air-dry at least 20min, closes the chamber door of ammonia case, passes into ammonia and carry out ammonia drying, and ammonia drying time is 10min; Then close ammonia, open air exhauster exhausting at least 20min.
4, reinforced layered slurry is coated: the back-up coat slip number of plies is 5 layers ~ 7 layers; Reinforced layered slurry bonding agent is silicate hydrolyzate liquid, and silicate hydrolyzate liquid dioxide-containing silica is 20%, and refractory material is upper shop powder, and the granularity of upper shop powder is 270 orders, and analyzing pure is hydrochloric acid; Back-up coat slip proportioning is: every 1Kg silicate hydrolyzate liquid, adds shop powder 2.6Kg, add hydrochloric acid 5 milliliters; Slip proportion after preparing is 1.72g/cm
3~ 1.85g/cm
3, pH value is 2 ~ 3; Back-up coat stucco granularity is shop sand in 36 order ~ 24 objects.Often be coated with after making one deck reinforced layered slurry, be placed into by wax-pattern assembly in the ammonia case with air exhauster, advanced sector-style is done, and after air-dry at least 20min, closes the chamber door of ammonia case, passes into ammonia and carry out ammonia drying, and ammonia drying time is 10min; Then close ammonia, open air exhauster exhausting at least 20min.
5, coating of obturaging is coated: coating of obturaging is 1 layer; Coating bonding agent of obturaging is silicate hydrolyzate liquid, and silicate hydrolyzate liquid dioxide-containing silica is 20%, and refractory material is upper shop powder, and the granularity of upper shop powder is 270 orders, and analyzing pure is hydrochloric acid; Layered material of obturaging slurry proportioning is: every 1Kg silicate hydrolyzate liquid, adds shop powder 2.6Kg, add hydrochloric acid 5 milliliters; Slip proportion after preparing is 1.72g/cm
3~ 1.85g/cm
3, pH value is 2 ~ 3; The wax-pattern assembly natural drying at least 12h making coating of obturaging will be coated with.
Advantage of the present invention is: the manufacture method proposing a kind of large-scale diffuser precision castings composite shell, improves the collapsibility of shell, reduce the difficulty of shelling; Add the heat-insulating property of shell, stopped deficient casting and the rarefaction defect of foundry goods, improve the qualification rate of foundry goods.One embodiment of the present of invention, prove through test, the qualification rate of certain batch of large-scale diffuser precision castings brings up to more than 90% from less than 30%.
Detailed description of the invention
Below the present invention is described in further details.A manufacture method for large-scale diffuser precision castings composite shell, is characterized in that, the step manufacturing composite shell is as follows:
1, coat investment precoat: investment precoat bonding agent is Ludox, refractory material is 325 object zirconium English powder, and surface refiner is cobalt aluminate, and defoamer is n-octyl alcohol, and wetting agent is bleeding agent " T "; Surface layer slip proportioning is: every 1 liter of Ludox, adds wetting agent 5 milliliters, adds defoamer 10 milliliters, adds zirconium English powder 3.68Kg, adds cobalt aluminate 0.32Kg; Slip proportion after preparing is 2.65g/cm
3~ 2.95g/cm
3; Surface layer stucco granularity is 70 object emergies.The wax-pattern assembly natural drying at least 12h making investment precoat will be coated with;
2, transition zone coating is coated: the number of plies of transition zone coating is 2 layers ~ 5 layers; Transition zone coating bonding agent is silicate hydrolyzate liquid, and silicate hydrolyzate liquid dioxide-containing silica is 20%, and refractory material is upper shop powder, and the granularity of upper shop powder is 270 orders, and analyzing pure is hydrochloric acid; Transition zone slip proportioning is: every 1Kg silicate hydrolyzate liquid, adds shop powder 2.6Kg, add hydrochloric acid 5 milliliters; Slip proportion after preparing is 1.72g/cm
3~ 1.85g/cm
3, pH value is 2 ~ 3; Transition zone stucco granularity is shop sand in 36 order ~ 24 objects.Often be coated with after making one deck transition zone coating, be placed into by wax-pattern assembly in the ammonia case with air exhauster, advanced sector-style is done, and after air-dry at least 20min, closes the chamber door of ammonia case, passes into ammonia and carry out ammonia drying, and ammonia drying time is 10min; Then close ammonia, open air exhauster exhausting at least 20min.
3, heat-insulation layer coating is coated: the number of plies of heat-insulation layer coating is 2 layers ~ 4 layers; Heat-insulation layer coating bonding agent is latex and silicate hydrolyzate liquid, and refractory material is upper shop powder, and the granularity of upper shop powder is 270 orders, and analyzing pure is alcohol and hydrochloric acid; Heat-insulation layer slip proportioning is: every 20Kg silicate hydrolyzate liquid, adds latex 3.26Kg, add alcohol 5000 milliliters, add hydrochloric acid 100 milliliters, add shop powder 34Kg ~ 38Kg; Slip proportion after preparing is 1.6g/cm
3~ 1.71g/cm
3, pH value is 2 ~ 3; Heat-insulation layer stucco granularity is shop sand in 36 order ~ 24 objects.Often be coated with after making one layer of heat preservation coating, be placed into by wax-pattern assembly in the ammonia case with air exhauster, advanced sector-style is done, and after air-dry at least 20min, closes the chamber door of ammonia case, passes into ammonia and carry out ammonia drying, and ammonia drying time is 10min; Then close ammonia, open air exhauster exhausting at least 20min.
4, reinforced layered slurry is coated: the back-up coat slip number of plies is 5 layers ~ 7 layers; Reinforced layered slurry bonding agent is silicate hydrolyzate liquid, and silicate hydrolyzate liquid dioxide-containing silica is 20%, and refractory material is upper shop powder, and the granularity of upper shop powder is 270 orders, and analyzing pure is hydrochloric acid; Back-up coat slip proportioning is: every 1Kg silicate hydrolyzate liquid, adds shop powder 2.6Kg, add hydrochloric acid 5 milliliters; Slip proportion after preparing is 1.72g/cm
3~ 1.85g/cm
3, pH value is 2 ~ 3; Back-up coat stucco granularity is shop sand in 36 order ~ 24 objects.Often be coated with after making one deck reinforced layered slurry, be placed into by wax-pattern assembly in the ammonia case with air exhauster, advanced sector-style is done, and after air-dry at least 20min, closes the chamber door of ammonia case, passes into ammonia and carry out ammonia drying, and ammonia drying time is 10min; Then close ammonia, open air exhauster exhausting at least 20min.
5, coating of obturaging is coated: coating of obturaging is 1 layer; Coating bonding agent of obturaging is silicate hydrolyzate liquid, and silicate hydrolyzate liquid dioxide-containing silica is 20%, and refractory material is upper shop powder, and the granularity of upper shop powder is 270 orders, and analyzing pure is hydrochloric acid; Layered material of obturaging slurry proportioning is: every 1Kg silicate hydrolyzate liquid, adds shop powder 2.6Kg, add hydrochloric acid 5 milliliters; Slip proportion after preparing is 1.72g/cm
3~ 1.85g/cm
3, pH value is 2 ~ 3; The wax-pattern assembly natural drying at least 12h making coating of obturaging will be coated with.
Operation principle of the present invention is:
Such casting weight is generally heavier, and generally at more than 50Kg, for ensureing that shell has certain intensity, the paint case making number of plies is generally more than 11 layers, and shell is thicker, and collapsibility is bad, not easily shells after casting pouring; In addition, due to casting structure more complicated, the pouring metal melt time is longer, and the flowing time in shell is longer, at the position that molten metal finally flows to, because molten metal temperature declines, causes foundry goods can not effectively filling, easily produces and owe to cast and rarefaction defect.The key solving above two problems will add a kind of bonding agent in the back-up coat of shell, this bonding agent will meet 2 requirements, and first requirement is: after adding this bonding agent, and shell will have poor thermal conductivity, to be well incubated molten metal, to prevent foundry goods from producing and owe casting and loosen; Second point requires: shell has certain porosity, there to be good collapsibility after casting pouring.Latex forms hole after high-temperature roasting in the middle of shell, these holes had both made shell easily clear up, and the thermal conductivity of air is poor, good heat insulation effect can be played to shell, therefore, in the middle of shell, add this bonding agent of latex can meet above 2 requirements: the collapsibility improving shell, reduces the difficulty of shelling; Add the heat-insulating property of shell, stopped deficient casting and the rarefaction defect of foundry goods, improve the qualification rate of foundry goods.
Embodiment 1:
1, coat investment precoat: investment precoat bonding agent is Ludox, refractory material is 325 object zirconium English powder, and surface refiner is cobalt aluminate, and defoamer is n-octyl alcohol, and wetting agent is bleeding agent " T "; Surface layer slip proportioning is: every 1 liter of Ludox, adds wetting agent 5 milliliters, adds defoamer 10 milliliters, adds zirconium English powder 3.68Kg, adds cobalt aluminate 0.32Kg; Surface layer slip proportion after preparing is 2.65g/cm
3; Surface layer stucco granularity is 70 object emergies.The wax-pattern assembly natural drying 12h making investment precoat will be coated with;
2, transition zone coating is coated: the number of plies of transition zone coating is 2 layers; Transition zone coating bonding agent is silicate hydrolyzate liquid, and silicate hydrolyzate liquid dioxide-containing silica is 20%, and refractory material is upper shop powder, and the granularity of upper shop powder is 270 orders, and analyzing pure is hydrochloric acid; Transition zone slip proportioning is: every 1Kg silicate hydrolyzate liquid, adds shop powder 2.6Kg, add hydrochloric acid 5 milliliters; Slip proportion after preparing is 1.72g/cm
3, pH value is 2; Transition zone stucco granularity is shop sand in 36 objects.Often be coated with after making one deck transition zone coating, be placed into by wax-pattern assembly in the ammonia case with air exhauster, advanced sector-style is done, and after air-dry 20min, closes the chamber door of ammonia case, passes into ammonia and carry out ammonia drying, and ammonia drying time is 10min; Then close ammonia, open air exhauster exhausting 20min.
3, heat-insulation layer coating is coated: the number of plies of heat-insulation layer coating is 2 layers; Heat-insulation layer coating bonding agent is latex and silicate hydrolyzate liquid, and refractory material is upper shop powder, and the granularity of upper shop powder is 270 orders, and analyzing pure is alcohol and hydrochloric acid; Heat-insulation layer slip proportioning is: every 20Kg silicate hydrolyzate liquid, adds latex 3.26Kg, add alcohol 5000 milliliters, add hydrochloric acid 100 milliliters, add shop powder 34Kg; Slip proportion after preparing is 1.6g/cm
3, pH value is 2; Heat-insulation layer stucco granularity is shop sand in 36 objects.Often be coated with after making one layer of heat preservation coating, be placed into by wax-pattern assembly in the ammonia case with air exhauster, advanced sector-style is done, and after air-dry 20min, closes the chamber door of ammonia case, passes into ammonia and carry out ammonia drying, and ammonia drying time is 10min; Then close ammonia, open air exhauster exhausting 20min.
4, reinforced layered slurry is coated: the back-up coat slip number of plies is 5 layers; Reinforced layered slurry bonding agent is silicate hydrolyzate liquid, and silicate hydrolyzate liquid dioxide-containing silica is 20%, and refractory material is upper shop powder, and the granularity of upper shop powder is 270 orders, and analyzing pure is hydrochloric acid; Back-up coat slip proportioning is: every 1Kg silicate hydrolyzate liquid, adds shop powder 2.6Kg, add hydrochloric acid 5 milliliters; Slip proportion after preparing is 1.72g/cm
3, pH value is 2; Back-up coat stucco granularity is shop sand in 36 objects.Often be coated with after making one deck reinforced layered slurry, be placed into by wax-pattern assembly in the ammonia case with air exhauster, advanced sector-style is done, and after air-dry 20min, closes the chamber door of ammonia case, passes into ammonia and carry out ammonia drying, and ammonia drying time is 10min; Then close ammonia, open air exhauster exhausting 20min.
5, coating of obturaging is coated: coating of obturaging is 1 layer; Coating bonding agent of obturaging is silicate hydrolyzate liquid, and silicate hydrolyzate liquid dioxide-containing silica is 20%, and refractory material is upper shop powder, and the granularity of upper shop powder is 270 orders, and analyzing pure is hydrochloric acid; Layered material of obturaging slurry proportioning is: every 1Kg silicate hydrolyzate liquid, adds shop powder 2.6Kg, add hydrochloric acid 5 milliliters; Slip proportion after preparing is 1.72g/cm
3, pH value is 2; The wax-pattern assembly natural drying 12h making coating of obturaging will be coated with.
Embodiment 2:
1, coat investment precoat: investment precoat bonding agent is Ludox, refractory material is 325 object zirconium English powder, and surface refiner is cobalt aluminate, and defoamer is n-octyl alcohol, and wetting agent is bleeding agent " T "; Surface layer slip proportioning is: every 1 liter of Ludox, adds wetting agent 5 milliliters, adds defoamer 10 milliliters, adds zirconium English powder 3.68Kg, adds cobalt aluminate 0.32Kg; Slip proportion after preparing is 2.80g/cm
3; Surface layer stucco granularity is 70 object emergies.The wax-pattern assembly natural drying at least 16h making investment precoat will be coated with;
2, transition zone coating is coated: the number of plies of transition zone coating is 3 layers; Transition zone coating bonding agent is silicate hydrolyzate liquid, and silicate hydrolyzate liquid dioxide-containing silica is 20%, and refractory material is upper shop powder, and the granularity of upper shop powder is 270 orders, and analyzing pure is hydrochloric acid; Transition zone slip proportioning is: every 1Kg silicate hydrolyzate liquid, adds shop powder 2.6Kg, add hydrochloric acid 5 milliliters; Slip proportion after preparing is 1.80g/cm
3, pH value is 2.5; Transition zone stucco granularity is shop sand in 36 objects.Often be coated with after making one deck transition zone coating, be placed into by wax-pattern assembly in the ammonia case with air exhauster, advanced sector-style is done, and after air-dry 25min, closes the chamber door of ammonia case, passes into ammonia and carry out ammonia drying, and ammonia drying time is 10min; Then close ammonia, open air exhauster exhausting 25min.
3, heat-insulation layer coating is coated: the number of plies of heat-insulation layer coating is 3 layers; Heat-insulation layer coating bonding agent is latex and silicate hydrolyzate liquid, and refractory material is upper shop powder, and the granularity of upper shop powder is 270 orders, and analyzing pure is alcohol and hydrochloric acid; Heat-insulation layer slip proportioning is: every 20Kg silicate hydrolyzate liquid, adds latex 3.26Kg, add alcohol 5000 milliliters, add hydrochloric acid 100 milliliters, add shop powder 36Kg; Slip proportion after preparing is 1.65g/cm
3, pH value is 2.5; Heat-insulation layer stucco granularity is shop sand in 36 objects.Often be coated with after making one layer of heat preservation coating, be placed into by wax-pattern assembly in the ammonia case with air exhauster, advanced sector-style is done, and after air-dry 25min, closes the chamber door of ammonia case, passes into ammonia and carry out ammonia drying, and ammonia drying time is 10min; Then close ammonia, open air exhauster exhausting 25min.
4, reinforced layered slurry is coated: the back-up coat slip number of plies is 6 layers; Reinforced layered slurry bonding agent is silicate hydrolyzate liquid, and silicate hydrolyzate liquid dioxide-containing silica is 20%, and refractory material is upper shop powder, and the granularity of upper shop powder is 270 orders, and analyzing pure is hydrochloric acid; Back-up coat slip proportioning is: every 1Kg silicate hydrolyzate liquid, adds shop powder 2.6Kg, add hydrochloric acid 5 milliliters; Slip proportion after preparing is 1.75g/cm
3, pH value is 2.5; Back-up coat stucco granularity is shop sand in 24 objects.Often be coated with after making one deck reinforced layered slurry, be placed into by wax-pattern assembly in the ammonia case with air exhauster, advanced sector-style is done, and after air-dry 25min, closes the chamber door of ammonia case, passes into ammonia and carry out ammonia drying, and ammonia drying time is 10min; Then close ammonia, open air exhauster exhausting 25min.
5, coating of obturaging is coated: coating of obturaging is 1 layer; Coating bonding agent of obturaging is silicate hydrolyzate liquid, and silicate hydrolyzate liquid dioxide-containing silica is 20%, and refractory material is upper shop powder, and the granularity of upper shop powder is 270 orders, and analyzing pure is hydrochloric acid; Layered material of obturaging slurry proportioning is: every 1Kg silicate hydrolyzate liquid, adds shop powder 2.6Kg, add hydrochloric acid 5 milliliters; Slip proportion after preparing is 1.75g/cm
3, pH value is 2.5; The wax-pattern assembly natural drying 16h making coating of obturaging will be coated with.
Embodiment 3:
1, coat investment precoat: investment precoat bonding agent is Ludox, refractory material is 325 object zirconium English powder, and surface refiner is cobalt aluminate, and defoamer is n-octyl alcohol, and wetting agent is bleeding agent " T "; Surface layer slip proportioning is: every 1 liter of Ludox, adds wetting agent 5 milliliters, adds defoamer 10 milliliters, adds zirconium English powder 3.68Kg, adds cobalt aluminate 0.32Kg; Surface layer slip proportion after preparing is 2.95g/cm
3; Surface layer stucco granularity is 70 object emergies.The wax-pattern assembly natural drying 24h making investment precoat will be coated with;
2, transition zone coating is coated: the number of plies of transition zone coating is 5 layers; Transition zone coating bonding agent is silicate hydrolyzate liquid, and silicate hydrolyzate liquid dioxide-containing silica is 20%, and refractory material is upper shop powder, and the granularity of upper shop powder is 270 orders, and analyzing pure is hydrochloric acid; Transition zone slip proportioning is: every 1Kg silicate hydrolyzate liquid, adds shop powder 2.6Kg, add hydrochloric acid 5 milliliters; Slip proportion after preparing is 1.85g/cm
3, pH value is 3; Transition zone stucco granularity is shop sand in 36 objects.Often be coated with after making one deck transition zone coating, be placed into by wax-pattern assembly in the ammonia case with air exhauster, advanced sector-style is done, and after air-dry 30min, closes the chamber door of ammonia case, passes into ammonia and carry out ammonia drying, and ammonia drying time is 10min; Then close ammonia, open air exhauster exhausting 30min.
3, heat-insulation layer coating is coated: the number of plies of heat-insulation layer coating is 4 layers; Heat-insulation layer coating bonding agent is latex and silicate hydrolyzate liquid, and refractory material is upper shop powder, and the granularity of upper shop powder is 270 orders, and analyzing pure is alcohol and hydrochloric acid; Heat-insulation layer slip proportioning is: every 20Kg silicate hydrolyzate liquid, adds latex 3.26Kg, add alcohol 5000 milliliters, add hydrochloric acid 100 milliliters, add shop powder 38Kg; Slip proportion after preparing is 1.71g/cm
3, pH value is 3; Heat-insulation layer stucco granularity is shop sand in 24 objects.Often be coated with after making one layer of heat preservation coating, be placed into by wax-pattern assembly in the ammonia case with air exhauster, advanced sector-style is done, and after air-dry 30min, closes the chamber door of ammonia case, passes into ammonia and carry out ammonia drying, and ammonia drying time is 10min; Then close ammonia, open air exhauster exhausting 30min.
4, reinforced layered slurry is coated: the back-up coat slip number of plies is 7 layers; Reinforced layered slurry bonding agent is silicate hydrolyzate liquid, and silicate hydrolyzate liquid dioxide-containing silica is 20%, and refractory material is upper shop powder, and the granularity of upper shop powder is 270 orders, and analyzing pure is hydrochloric acid; Back-up coat slip proportioning is: every 1Kg silicate hydrolyzate liquid, adds shop powder 2.6Kg, add hydrochloric acid 5 milliliters; Slip proportion after preparing is 1.72g/cm
3, pH value is 3; Back-up coat stucco granularity is shop sand in 24 objects.Often be coated with after making one deck reinforced layered slurry, be placed into by wax-pattern assembly in the ammonia case with air exhauster, advanced sector-style is done, and after air-dry 30min, closes the chamber door of ammonia case, passes into ammonia and carry out ammonia drying, and ammonia drying time is 10min; Then close ammonia, open air exhauster exhausting 30min.
5, coating of obturaging is coated: coating of obturaging is 1 layer; Coating bonding agent of obturaging is silicate hydrolyzate liquid, and silicate hydrolyzate liquid dioxide-containing silica is 20%, and refractory material is upper shop powder, and the granularity of upper shop powder is 270 orders, and analyzing pure is hydrochloric acid; Layered material of obturaging slurry proportioning is: every 1Kg silicate hydrolyzate liquid, adds shop powder 2.6Kg, add hydrochloric acid 5 milliliters; Slip proportion after preparing is 1.72g/cm
3, pH value is 3; The wax-pattern assembly natural drying 24h making coating of obturaging will be coated with.
Claims (1)
1. a manufacture method for large-scale diffuser precision castings composite shell, is characterized in that, the step manufacturing composite shell is as follows:
1.1, coat investment precoat: investment precoat bonding agent is Ludox, refractory material is 325 object zirconium English powder, and surface refiner is cobalt aluminate, and defoamer is n-octyl alcohol, and wetting agent is bleeding agent " T "; Surface layer slip proportioning is: every 1 liter of Ludox, adds wetting agent 5 milliliters, adds defoamer 10 milliliters, adds zirconium English powder 3.68Kg, adds cobalt aluminate 0.32Kg; Slip proportion after preparing is 2.65g/cm
3~ 2.95g/cm
3; Surface layer stucco granularity is 70 object emergies.The wax-pattern assembly natural drying at least 12h making investment precoat will be coated with;
1.2, transition zone coating is coated: the number of plies of transition zone coating is 2 layers ~ 5 layers; Transition zone coating bonding agent is silicate hydrolyzate liquid, and silicate hydrolyzate liquid dioxide-containing silica is 20%, and refractory material is upper shop powder, and the granularity of upper shop powder is 270 orders, and analyzing pure is hydrochloric acid; Transition zone slip proportioning is: every 1Kg silicate hydrolyzate liquid, adds shop powder 2.6Kg, add hydrochloric acid 5 milliliters; Slip proportion after preparing is 1.72g/cm
3~ 1.85g/cm
3, pH value is 2 ~ 3; Transition zone stucco granularity is shop sand in 36 order ~ 24 objects.Often be coated with after making one deck transition zone coating, be placed into by wax-pattern assembly in the ammonia case with air exhauster, advanced sector-style is done, and after air-dry at least 20min, closes the chamber door of ammonia case, passes into ammonia and carry out ammonia drying, and ammonia drying time is 10min; Then close ammonia, open air exhauster exhausting at least 20min.
1.3, heat-insulation layer coating is coated: the number of plies of heat-insulation layer coating is 2 layers ~ 4 layers; Heat-insulation layer coating bonding agent is latex and silicate hydrolyzate liquid, and refractory material is upper shop powder, and the granularity of upper shop powder is 270 orders, and analyzing pure is alcohol and hydrochloric acid; Heat-insulation layer slip proportioning is: every 20Kg silicate hydrolyzate liquid, adds latex 3.26Kg, add alcohol 5000 milliliters, add hydrochloric acid 100 milliliters, add shop powder 34Kg ~ 38Kg; Slip proportion after preparing is 1.6g/cm
3~ 1.71g/cm
3, pH value is 2 ~ 3; Heat-insulation layer stucco granularity is shop sand in 36 order ~ 24 objects.Often be coated with after making one layer of heat preservation coating, be placed into by wax-pattern assembly in the ammonia case with air exhauster, advanced sector-style is done, and after air-dry at least 20min, closes the chamber door of ammonia case, passes into ammonia and carry out ammonia drying, and ammonia drying time is 10min; Then close ammonia, open air exhauster exhausting at least 20min.
1.4, reinforced layered slurry is coated: the back-up coat slip number of plies is 5 layers ~ 7 layers; Reinforced layered slurry bonding agent is silicate hydrolyzate liquid, and silicate hydrolyzate liquid dioxide-containing silica is 20%, and refractory material is upper shop powder, and the granularity of upper shop powder is 270 orders, and analyzing pure is hydrochloric acid; Back-up coat slip proportioning is: every 1Kg silicate hydrolyzate liquid, adds shop powder 2.6Kg, add hydrochloric acid 5 milliliters; Slip proportion after preparing is 1.72g/cm
3~ 1.85g/cm
3, pH value is 2 ~ 3; Back-up coat stucco granularity is shop sand in 36 order ~ 24 objects.Often be coated with after making one deck reinforced layered slurry, be placed into by wax-pattern assembly in the ammonia case with air exhauster, advanced sector-style is done, and after air-dry at least 20min, closes the chamber door of ammonia case, passes into ammonia and carry out ammonia drying, and ammonia drying time is 10min; Then close ammonia, open air exhauster exhausting at least 20min.
1.5, coating of obturaging is coated: coating of obturaging is 1 layer; Coating bonding agent of obturaging is silicate hydrolyzate liquid, and silicate hydrolyzate liquid dioxide-containing silica is 20%, and refractory material is upper shop powder, and the granularity of upper shop powder is 270 orders, and analyzing pure is hydrochloric acid; Layered material of obturaging slurry proportioning is: every 1Kg silicate hydrolyzate liquid, adds shop powder 2.6Kg, add hydrochloric acid 5 milliliters; Slip proportion after preparing is 1.72g/cm
3~ 1.85g/cm
3, pH value is 2 ~ 3; The wax-pattern assembly natural drying at least 12h making coating of obturaging will be coated with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510353449.0A CN104923729B (en) | 2015-06-24 | 2015-06-24 | Manufacturing method of composite shell of large diffuser precision casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510353449.0A CN104923729B (en) | 2015-06-24 | 2015-06-24 | Manufacturing method of composite shell of large diffuser precision casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104923729A true CN104923729A (en) | 2015-09-23 |
| CN104923729B CN104923729B (en) | 2017-01-25 |
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| CN105483440A (en) * | 2015-12-29 | 2016-04-13 | 青岛博泰美联化工技术有限公司 | Environment-friendly type preparation method for automobile engine blade |
| CN105522111A (en) * | 2015-12-29 | 2016-04-27 | 青岛博泰美联化工技术有限公司 | Manufacturing method for ventilation type shell |
| CN105537518A (en) * | 2015-12-30 | 2016-05-04 | 青岛博泰美联化工技术有限公司 | Preparation method of engine component |
| CN105618676A (en) * | 2015-12-29 | 2016-06-01 | 青岛博泰美联化工技术有限公司 | Environment-friendly preparation method for automobile engine shell |
| CN105618679A (en) * | 2015-12-30 | 2016-06-01 | 青岛博泰美联化工技术有限公司 | Preparation method for automobile charging turbine |
| CN106623772A (en) * | 2016-12-16 | 2017-05-10 | 中航动力股份有限公司 | Integrally casting mold for aero-engine diffuser |
| CN107866517A (en) * | 2017-11-30 | 2018-04-03 | 中国科学院金属研究所 | Surface layer slurry with high-temperature stability and its application for the casting of big module |
| CN108941456A (en) * | 2016-05-13 | 2018-12-07 | 上海万泽精密铸造有限公司 | Based on the shell and its preparation method that vitreous silica, surface compact are smooth |
| CN112658211A (en) * | 2020-12-08 | 2021-04-16 | 河北钢研德凯科技有限公司 | Single crystal high temperature alloy shell and preparation method thereof |
| CN115041629A (en) * | 2022-06-28 | 2022-09-13 | 河北钢研德凯科技有限公司 | Composite shell surface coating and composite shell |
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| CN105483440A (en) * | 2015-12-29 | 2016-04-13 | 青岛博泰美联化工技术有限公司 | Environment-friendly type preparation method for automobile engine blade |
| CN105522111A (en) * | 2015-12-29 | 2016-04-27 | 青岛博泰美联化工技术有限公司 | Manufacturing method for ventilation type shell |
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| CN108994258A (en) * | 2016-05-13 | 2018-12-14 | 上海万泽精密铸造有限公司 | The preparation method of the shell of the nozzle ring casting of K403 high temperature alloy |
| CN108941456A (en) * | 2016-05-13 | 2018-12-07 | 上海万泽精密铸造有限公司 | Based on the shell and its preparation method that vitreous silica, surface compact are smooth |
| CN108941457A (en) * | 2016-05-13 | 2018-12-07 | 上海万泽精密铸造有限公司 | The preparation method of the shell of the guide vane casting of K438 high temperature alloy |
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| CN108941457B (en) * | 2016-05-13 | 2019-12-31 | 上海万泽精密铸造有限公司 | Preparation method of shell of guide blade casting made of K438 high-temperature alloy |
| CN106623772A (en) * | 2016-12-16 | 2017-05-10 | 中航动力股份有限公司 | Integrally casting mold for aero-engine diffuser |
| CN107866517A (en) * | 2017-11-30 | 2018-04-03 | 中国科学院金属研究所 | Surface layer slurry with high-temperature stability and its application for the casting of big module |
| CN112658211A (en) * | 2020-12-08 | 2021-04-16 | 河北钢研德凯科技有限公司 | Single crystal high temperature alloy shell and preparation method thereof |
| CN115041629A (en) * | 2022-06-28 | 2022-09-13 | 河北钢研德凯科技有限公司 | Composite shell surface coating and composite shell |
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Address after: Weiyang Xu Jia Wan 710021 Shaanxi city of Xi'an Province Patentee after: AECC AVIATION POWER CO,LTD. Address before: Weiyang Xu Jia Wan 710021 Shaanxi city of Xi'an Province Patentee before: AVIC AVIATION ENGINE Corp.,PLC Address after: Weiyang Xu Jia Wan 710021 Shaanxi city of Xi'an Province Patentee after: AVIC AVIATION ENGINE Corp.,PLC Address before: Weiyang Xu Jia Wan 710021 Shaanxi city of Xi'an Province Patentee before: XI'AN AVIATION POWER Co.,Ltd. |
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