CN103693976A - Method for preparing silicon oxide-based ceramic core for titanium and titanium alloy casting - Google Patents
Method for preparing silicon oxide-based ceramic core for titanium and titanium alloy casting Download PDFInfo
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- CN103693976A CN103693976A CN201310662113.3A CN201310662113A CN103693976A CN 103693976 A CN103693976 A CN 103693976A CN 201310662113 A CN201310662113 A CN 201310662113A CN 103693976 A CN103693976 A CN 103693976A
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Abstract
The invention relates to a method for preparing a silicon oxide-based ceramic core for titanium and titanium alloy casting. The method comprises steps of preparing a blank of the silicon oxide-based ceramic core, preparing a ZrO2 or Y2O3 coating on the surface of the blank of the silicon oxide-based ceramic core through a surface coating technology, and intensively sintering the ceramic core. The silicon oxide-based ceramic core prepared by the method can effectively overcome the defect that the zirconia or yttria-based ceramic core has high cost and is difficult to remove as well as the defect that conventional silicon oxide ceramic core cannot be used due to strong interfacial reaction in solidification of the titanium alloy.
Description
Technical field
The present invention is the preparation method of silica-based ceramic core for a kind of titanium or titanium alloy casting, belongs to titanium alloy precision casting manufacture field.
Background technology
Conventionally the complicated inner cavity moulding of metal founding is mainly by carrying out moulding with prefabricated ceramic core, and manages to remove after coagulation forming to be cast.Its technical process is as follows: wax-pattern preparation, shell processed, shell dewaxing and roasting, alloy casting, the depoling of ceramic core prepared, contained to ceramic core.Fast development along with China's aerospace flight vehicle and engine thereof, in order to realize the target of loss of weight, demand to titanium alloy casting is more and more extensive, shape and the structure of needed titanium alloy casting become increasingly complex, particularly inner-cavity structure becomes increasingly complex, and causes titanium alloy casting more and more urgent by the demand of core.
At present, aluminum oxide, silica-based ceramic core cost are low, high for superalloy chemistry inertia, therefore widespread use in superalloy casting.But because the type core material does not possess the chemical reaction inertia good to molten titanium alloy, very easily on titanium alloy casting surface, form responding layer, be not suitable for being applied to titanium alloy fine casting field.Zirconium white and yttrium oxide have caused related scientific research personnel's concern because having to the good chemical reaction inertia of molten titanium alloy, zirconium white and yttrium core have successively been developed, but in actual applications because such core cost is high, unreactiveness is large, and intensity is high, after casting, core removes extremely difficult, therefore, be only suitable for simple shape, the inner-cavity structure moulding that hole depth is little.Because calcium oxide has the chemical reaction inertia good to molten titanium alloy, and soluble in water, therefore some researchers have been carried out the research of calcium oxide ceramics core, as the Chinese invention patent application of publication number CN102531648A discloses calcium oxide matrix ceramic core and preparation method for a kind of Ti alloy casting, it includes the composition of following weight percent: 1.0～15% zirconium dioxide, 0.5～10.0% yttrium oxide, 0.05～0.1% Thorotrast and the silicon oxide of surplus.In this patent, the content of calcium oxide is 74.9～98.45wt%, due to comparatively complicated in titanium alloy precision casting technique, the duration of pouring that is prepared into alloy from the wax-pattern containing ceramic core is general all more than two weeks, and core in use will contact with water-based paint.After the core chance water that above-mentioned patent is prepared, hydration reaction occurs and cause the defeated and dispersed of core, therefore, above-mentioned core is difficult to be applied to titanium alloy precision casting field.The Chinese invention patent application of publication number CN1793033A discloses a kind of titanium alloy precision casting ceramic core material, and main body composition is zirconium white, and its content is 60～85wt%, and wherein the content of calcium oxide is 4～20wt%.At present, the depoling technique of core mainly contains: mechanical force is destroyed depoling, chemical corrosion depoling, mechanical force and destroyed the depoling that combines with chemical corrosion, is difficult to carry out mechanical force destruction removes and can only adopt chemical corrosion depoling method for the core of complicated shape.In above-mentioned core, zirconic content is more, and zirconium white is again a kind of stable compound, is insoluble to acid-base solution, therefore, and the depoling of core difficulty, and owing to containing a certain amount of calcium oxide in core, core is faced with in use aquation problem equally.
All extensively adopt at present titanium alloy precise-investment casting technology to prepare titanium alloy casting both at home and abroad, realize the Near net shape moulding of foundry goods.Ceramic core need to be preset in fusible pattern, carries out paint case making, and in shell operation processed, core will contact with moisture coating, once and can generate pulverous calcium hydroxide after calcium oxide ceramics core water suction and make core defeated and dispersed and can not use.
Summary of the invention
The present invention designs for above-mentioned problems of the prior art just provides the preparation method of a kind of titanium or titanium alloy casting with silica-based ceramic core, its objective is develop a kind ofly there is high unreactiveness, easily remove, ceramic core that cost is low.
The object of the invention is to be achieved through the following technical solutions:
This kind of titanium or titanium alloy cast the preparation method with silica-based ceramic core, it is characterized in that: steps of the method are:
Step 1, prepare silicon oxide core blank
Silica powder, softening agent are obtained to silicon oxide core blank through mixing, moulding, sintering, and the weight percent of silica powder, softening agent is respectively: 85～95%, 5～15%;
The chemical feedstocks and the weight percent that form softening agent are: paraffin 50～80wt%, beeswax 10～40wt%, oleic acid are 5～10wt%, and softening agent is to be mixed by above-mentioned chemical feedstocks;
Step 2, in silicon oxide core blank surface, prepare ZrO
2or Y
2o
3nano thin-film, preparation process is as follows:
(1) adopt method of sieving to prepare ZrO
2or Y
2o
3powder, granularity is controlled at 200～400 orders, at ZrO
2or Y
2o
3after adding caking agent to mix in powder, stir, prepare flow cup viscosity at the coating of 10～40S, caking agent is silicon sol, acetic acid zirconium or yttrium colloidal sol, and the add-on of caking agent is ZrO
2or Y
2o
35%～10% of powder quality;
By coating with dip-coating, spraying or showering mode at the complete coating one deck of silicon oxide core blank surface, dry 2～12h under atmosphere at room temperature environment then;
Step 3, core intensified-sintered
Silicon oxide core blank sintering 1～10h at 900～1500 ℃, obtains silica-based ceramic core.
Technical solution of the present invention is by applying one deck ZrO in pure silica core blank surface
2or Y
2o
3coating way changes the unreactiveness of core.With respect to ceramic base core of the prior art, expanded the starting material of core, can adopt silicon oxide to carry out core preparation; Utilize the mode of surface-coated in core blank surface coating, both improved the unreactiveness of silicon oxide core liquid towards titanium alloy, utilized again silicon oxide core advantage cheaply, utilize ripe silicon oxide core alkali removing process simultaneously, be applicable to the core preparation in titanium alloy precision casting technique.
Embodiment
Below with reference to embodiment, technical solution of the present invention is further described:
Embodiment 1
This kind of titanium or titanium alloy cast the preparation method with silica-based ceramic core, it is characterized in that: steps of the method are:
Step 1, prepare silicon oxide core blank
By 85kgSiO
2, 7.5kg paraffin, 6kg beeswax and 1.5kg oleic acid mix, then moulding, sintering, in sintering process, paraffin, beeswax and oleic acid all vapor away, remaining pure silica only, so obtain pure silica core blank after sintering;
Step 2, in silicon oxide core blank surface, prepare ZrO
2or Y
2o
3nano thin-film, preparation process is as follows:
(1) adopt method of sieving to prepare ZrO
2or Y
2o
3powder, granularity is controlled at 200～400 orders, at ZrO
2or Y
2o
3after adding caking agent to mix in powder, stir, prepare flow cup viscosity at the coating of 40S, caking agent is silicon sol, acetic acid zirconium or yttrium colloidal sol, and the add-on of caking agent is ZrO
2or Y
2o
35% of powder quality;
By coating with dip-coating, spraying or showering mode at the complete coating one deck of silicon oxide core blank surface, dry 12h under atmosphere at room temperature environment then;
Step 3, core intensified-sintered
Silicon oxide core blank sintering 12h at 900 ℃, obtains silica-based ceramic core.
To the above-mentioned silica-based ceramic core being prepared into, test-results is shown in Table 1.
Table 1 depoling, foundry goods interfacial reaction layer and surface roughness experimental result
As seen from Table 1, the silica-based ceramic core of preparing is through after smelting and pouring experiment, and depoling rate reaches 95%, interfacial reaction layer maximum ga(u)ge 0.4mm, and cast(ing) surface maximal roughness 6.5 μ m, can meet the demand of titanium alloy precision casting.
Embodiment 2
This kind of titanium or titanium alloy cast the preparation method with silica-based ceramic core, it is characterized in that: steps of the method are:
Step 1, prepare silicon oxide core blank
The paraffin of 95kgCaO, 4kg, 0.5kg beeswax, 0.5kg oleic acid are mixed, then moulding, sintering, in sintering process, paraffin, beeswax and oleic acid all vapor away, remaining pure silica only, so after sintering, obtain pure silica core blank;
Step 2, in silicon oxide core blank surface, prepare ZrO
2or Y
2o
3nano thin-film, preparation process is as follows:
(1) adopt method of sieving to prepare ZrO
2or Y
2o
3powder, granularity is controlled at 200～400 orders, at ZrO
2or Y
2o
3after adding caking agent to mix in powder, stir, prepare flow cup viscosity at the coating of 30S, caking agent is silicon sol, acetic acid zirconium or yttrium colloidal sol, and the add-on of caking agent is ZrO
2or Y
2o
37% of powder quality;
By coating with dip-coating, spraying or showering mode at the complete coating one deck of silicon oxide core blank surface, dry 10h under atmosphere at room temperature environment then;
Step 3, core intensified-sintered
Silicon oxide core blank sintering 8h at 1200 ℃, obtains silica-based ceramic core.
To the above-mentioned silica-based ceramic core being prepared into, test-results is shown in Table 2.
Table 2 depoling, foundry goods interfacial reaction layer and surface roughness experimental result
As seen from Table 2, the silica-based ceramic core of preparing is through after smelting and pouring experiment, and depoling rate reaches 95%, interfacial reaction layer maximum ga(u)ge 0.3mm, and cast(ing) surface maximal roughness 6.3 μ m, can meet the demand of titanium alloy precision casting.
Embodiment 3
This kind of titanium or titanium alloy cast the preparation method with silica-based ceramic core, it is characterized in that: steps of the method are:
Step 1, prepare silicon oxide core blank
The paraffin of 90kgCaO, 6kg, 3.5kg beeswax, 0.5kg oleic acid are mixed, then moulding, sintering, in sintering process, paraffin, beeswax and oleic acid all vapor away, remaining pure silica only, so after sintering, obtain pure silica core blank;
Step 2, in silicon oxide core blank surface, prepare ZrO
2or Y
2o
3nano thin-film, preparation process is as follows:
(1) adopt method of sieving to prepare ZrO
2or Y
2o
3powder, granularity is controlled at 200～400 orders, at ZrO
2or Y
2o
3after adding caking agent to mix in powder, stir, prepare flow cup viscosity at the coating of 5S, caking agent is silicon sol, acetic acid zirconium or yttrium colloidal sol, and the add-on of caking agent is ZrO
2or Y
2o
310% of powder quality;
By coating with dip-coating, spraying or showering mode at the complete coating one deck of silicon oxide core blank surface, dry 6h under atmosphere at room temperature environment then;
Step 3, core intensified-sintered
Silicon oxide core blank sintering 6h at 1300 ℃, obtains silica-based ceramic core.
To the above-mentioned silica-based ceramic core being prepared into, test-results is shown in Table 3.
Table 3 depoling, foundry goods interfacial reaction layer and surface roughness experimental result
As seen from Table 3, the silica-based ceramic core of preparing is through after smelting and pouring experiment, and depoling rate reaches 94%, interfacial reaction layer maximum ga(u)ge 0.3mm, and cast(ing) surface maximal roughness 6.3 μ m, can meet the demand of titanium alloy precision casting.
Embodiment 4
This kind of titanium or titanium alloy cast the preparation method with silica-based ceramic core, it is characterized in that: steps of the method are:
Step 1, prepare silicon oxide core blank
The paraffin of 90kgCaO, 6kg, 3.5kg beeswax, 0.5kg oleic acid are mixed, then moulding, sintering, in sintering process, paraffin, beeswax and oleic acid all vapor away, remaining pure silica only, so after sintering, obtain pure silica core blank;
Step 2, in silicon oxide core blank surface, prepare ZrO
2or Y
2o
3nano thin-film, preparation process is as follows:
(1) adopt method of sieving to prepare ZrO
2or Y
2o
3powder, granularity is controlled at 200～400 orders, at ZrO
2or Y
2o
3after adding caking agent to mix in powder, stir, prepare flow cup viscosity at the coating of 30S, caking agent is silicon sol, acetic acid zirconium or yttrium colloidal sol, and the add-on of caking agent is ZrO
2or Y
2o
37% of powder quality;
By coating with dip-coating, spraying or showering mode at the complete coating one deck of silicon oxide core blank surface, dry 2h under atmosphere at room temperature environment then;
Step 3, core intensified-sintered
Silicon oxide core blank sintering 4h at 1500 ℃, obtains silica-based ceramic core.
To the above-mentioned silica-based ceramic core being prepared into, test-results is shown in Table 4.
Table 4 depoling, foundry goods interfacial reaction layer and surface roughness experimental result
As seen from Table 4, the silica-based ceramic core of preparing is through after smelting and pouring experiment, and depoling rate reaches 94%, interfacial reaction layer maximum ga(u)ge 0.1mm, and cast(ing) surface maximal roughness 6.0 μ m, can meet the demand of titanium alloy precision casting.
Claims (1)
1. a preparation method for silica-based ceramic core for titanium or titanium alloy casting, is characterized in that: steps of the method are:
Step 1, prepare silicon oxide core blank
Silica powder, softening agent are obtained to silicon oxide core blank through mixing, moulding, sintering, and the weight percent of silica powder, softening agent is respectively: 85～95%, 5～15%;
The chemical feedstocks and the weight percent that form softening agent are: paraffin 50～80wt%, beeswax 10～40wt%, oleic acid are 5～10wt%, and softening agent is to be mixed by above-mentioned chemical feedstocks;
Step 2, in silicon oxide core blank surface, prepare ZrO
2or Y
2o
3nano thin-film, preparation process is as follows:
(1) adopt method of sieving to prepare ZrO
2or Y
2o
3powder, granularity is controlled at 200～400 orders, at ZrO
2or Y
2o
3after adding caking agent to mix in powder, stir, prepare flow cup viscosity at the coating of 10～40S, caking agent is silicon sol, acetic acid zirconium or yttrium colloidal sol, and the add-on of caking agent is ZrO
2or Y
2o
35%～10% of powder quality;
By coating with dip-coating, spraying or showering mode at the complete coating one deck of silicon oxide core blank surface, dry 2～12h under atmosphere at room temperature environment then;
Step 3, core intensified-sintered
Silicon oxide core blank sintering 1～10h at 900～1500 ℃, obtains silica-based ceramic core.
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| CN104289678A (en) * | 2014-10-30 | 2015-01-21 | 沈阳工业大学 | Method for manufacturing lacy square hole in casting manner |
| CN104289666A (en) * | 2014-10-30 | 2015-01-21 | 沈阳工业大学 | Method for manufacturing eagle-wing-shaped hole in casting manner |
| CN104128556B (en) * | 2014-05-24 | 2016-04-13 | 芜湖浙鑫新能源有限公司 | The ceramic core that a kind of inorganic easy depoling is defeated and dispersed |
| CN107324787A (en) * | 2017-07-11 | 2017-11-07 | 马鞍山市兴隆铸造有限公司 | A kind of method that carburizing deposition prepares high intensity silicon-base ceramic core |
| CN107737881A (en) * | 2017-09-18 | 2018-02-27 | 洛阳双瑞精铸钛业有限公司 | A kind of preparation method of the titanium alloy graphite molds casting with small gaps |
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| CN104128556B (en) * | 2014-05-24 | 2016-04-13 | 芜湖浙鑫新能源有限公司 | The ceramic core that a kind of inorganic easy depoling is defeated and dispersed |
| CN104289678A (en) * | 2014-10-30 | 2015-01-21 | 沈阳工业大学 | Method for manufacturing lacy square hole in casting manner |
| CN104289666A (en) * | 2014-10-30 | 2015-01-21 | 沈阳工业大学 | Method for manufacturing eagle-wing-shaped hole in casting manner |
| CN107324787A (en) * | 2017-07-11 | 2017-11-07 | 马鞍山市兴隆铸造有限公司 | A kind of method that carburizing deposition prepares high intensity silicon-base ceramic core |
| CN107737881A (en) * | 2017-09-18 | 2018-02-27 | 洛阳双瑞精铸钛业有限公司 | A kind of preparation method of the titanium alloy graphite molds casting with small gaps |
| CN108044042A (en) * | 2017-11-23 | 2018-05-18 | 中国航发北京航空材料研究院 | A kind of titanium or titanium alloy casting graphite-based core and preparation method thereof |
| CN109928780A (en) * | 2017-12-18 | 2019-06-25 | 沈阳航发精密铸造有限公司 | A kind of manufacturing method of ceramic core surface inertness coat |
| CN110227797A (en) * | 2019-07-12 | 2019-09-13 | 维捷(苏州)三维打印有限公司 | The preparation process and equipment of 3 D-printing ceramic shell for Ti alloy casting |
| CN113354422A (en) * | 2020-03-04 | 2021-09-07 | 中国科学院金属研究所 | Ceramic core for single crystal high-temperature alloy blade and preparation method thereof |
| CN111593287A (en) * | 2020-05-29 | 2020-08-28 | 深圳市万泽中南研究院有限公司 | Method for forming ceramic core aluminum oxide coating by supersonic plasma spraying |
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| CN112321287A (en) * | 2020-11-05 | 2021-02-05 | 山东瑞泰新材料科技有限公司 | Silicon oxide ceramic core with corrosion resistance on surface and manufacturing method thereof |
| CN112317695A (en) * | 2020-11-05 | 2021-02-05 | 山东瑞泰新材料科技有限公司 | Casting method of marine reversible turbine blade |
| CN113245509A (en) * | 2021-03-26 | 2021-08-13 | 江苏华钛瑞翔科技有限公司 | Near-net forming method for titanium alloy faucet blank |
| CN114394854A (en) * | 2022-01-18 | 2022-04-26 | 辽宁航安型芯科技股份有限公司 | Method for preparing silicon-based ceramic core isolation coating based on waste evaporation boat |
| CN116102364A (en) * | 2022-12-29 | 2023-05-12 | 江苏华钛瑞翔科技有限公司 | Anti-cracking inert ceramic core and preparation method thereof |
| CN116102364B (en) * | 2022-12-29 | 2024-04-05 | 江苏华钛瑞翔科技有限公司 | Anti-cracking inert ceramic core and preparation method thereof |
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Application publication date: 20140402 |