CN104014764A - Ceramic sprue gate bushing for low pressure casting of aluminum alloy and manufacturing method thereof - Google Patents
Ceramic sprue gate bushing for low pressure casting of aluminum alloy and manufacturing method thereof Download PDFInfo
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- CN104014764A CN104014764A CN201410218119.6A CN201410218119A CN104014764A CN 104014764 A CN104014764 A CN 104014764A CN 201410218119 A CN201410218119 A CN 201410218119A CN 104014764 A CN104014764 A CN 104014764A
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Abstract
The invention discloses a ceramic sprue gate bushing for low pressure casting of aluminum alloy and a manufacturing method of the ceramic sprue gate bushing for low pressure casting of aluminum alloy. The bushing is tubular and comprises a bushing body and a coating layer, wherein the bushing body is made of composite ceramic materials of aluminum oxide and aluminum titanate, and the coating layer is an aluminum titanate ceramic coating layer. The manufacturing method includes the steps that first, aluminum oxide raw material powder, titanium dioxide raw material powder and stabilizing agents are fully mixed to prepare base powder; second, the base powder is roasted at the temperature ranging from 1350 DEG C to 1400 DEG C so that aluminum titanate powder can be obtained; third, the aluminum titanate powder is added into aluminum oxide raw material powder according to the weight fraction ranging from 6 percent to 13 percent to be fully mixed so that mixed powder can be obtained; fourth, after the mixed powder is palletized, compression molding is performed, and pre-sintering is performed; the aluminum titanate powder, PVA glue and water are mixed to form a sizing agent; sixth, the pre-sintered body is placed in the sizing agent, and soaked in the sizing agent and lifted out of the sizing agent several times, and then the pre-sintered body is dried; seventh, a sprue gate bushing containing the aluminum titanate coating layer is placed in a furnace and sintered at the temperature ranging from 1450 DEG C to 1650 DEG C and then the final product can be obtained.
Description
Technical field
The present invention relates to aluminum alloy low-pressure casting technical field, particularly relate to sprue bushing of a kind of aluminum alloy low-pressure casting ceramic material and preparation method thereof.
Background technology
Compared with traditional gravitational casting technology, low pressure casting many advantages, at present, at the casting field of automobile component, as cylinder head, cylinder block, brake rim, clutch cap, wheel hub, inlet manifold etc., particularly, in the casting of automotive hub, use in a large number Low Pressure Casting Technology.
The performance characteristics such as for the low pressure casting of aluminium alloys for automobile part, sprue bushing is one of critical component of running gate system, and Service Environment needs it to have anti-thermal shock, and anti-aluminium liquid corrodes, and thermal conductivity factor is low.Generally use at present steel lining.But steel lining has following defect: (1) steel heat conduction is fast, easily occurs down cold phenomenon in casting process, and foundry goods does not also solidify, and cast gate first solidifies, and cannot realize feeding, causes the casting flaws such as shrinkage cavity and porosity; (2) steel easily oozes and is fused in aluminium liquid, pollutes aluminium liquid on the one hand, causes casting composition and performance change, and on the other hand, lining, by the easily remaining aluminium material that solidifies of aluminium corrosion place, causes pickup difficulty.
Another kind of more advanced its material of sprue bushing is alumina titanate ceramics, has thermal shock performance good, does not invade profit with plurality of colored metal liquid, corrosion-resistant, the low good characteristic that waits of heat conduction.But produce a large amount of microcracks because the serious thermal expansion anisotropy of aluminium titanates causes sintered body in cooling middle inner meeting, these microcracks are distributed on crystal boundary and crystal grain.Although the thermal expansion overwhelming majority is offset by making up of numerous microcracks in the time of heating al titanate sintering body, cause producing good thermal shock resistance, but the existence of crackle but makes material of aluminum titanate be difficult to dense sintering, cause mechanical strength lower, the about 20MPa of bending strength, therefore in the time of foundry goods pickup, aluminium titanates sprue bushing is easily by collision brittle failure, and therefore the pure aluminium titanates lining life-span is lower.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides the ceramic sprue bushing of a kind of aluminum alloy low-pressure casting, pottery sprue bushing be shaped as tubular, it is characterized in that: described ceramic sprue bushing comprises bush body 1 and coat 2, the coated layer of described bush body covers, described bush body is the composite pottery of aluminium oxide and aluminium titanates, and described coat is alumina titanate ceramics.
This aluminum alloy low-pressure casting comprises the following steps by the preparation method of ceramic sprue bushing:
(1) first alumina raw material powder and titanium dioxide material powder are mixed to get to original washing powder according to weight ratio 1.1 ~ 1.3:1, in described original washing powder, to add weight fraction be 6 ~ 10.5% stabilizing agent and fully mix;
(2) powder step (1) being obtained is milled to after 1.5 ~ 4 hours below 5 μ m 1350 DEG C ~ 1400 DEG C roastings, sieves and obtains aluminium titanates powder;
(3) metatitanic acid aluminium powder step (2) being obtained joins in alumina raw material powder and fully mixes by 6% ~ 13% weight fraction, obtains mixed powder;
(4) in mixed powder step (3) being obtained, add after PVA glue and water mixing granulation compressingly, then 1000 DEG C ~ 1300 DEG C presintering, obtain the presintering body of bush body;
(5) metatitanic acid aluminium powder step (2) being obtained and PVA glue and pure water are made into slurry, and weight fraction is: aluminium titanates content is that 20% ~ 75%, PVA glue content is 20% ~ 50%, and all the other are pure water;
(6) sprue bushing presintering body step (4) being obtained is placed in the aluminium titanates slurry several seconds of (5) arrangements of steps and takes out and dry or dry, and repeats for several times, makes surface produce the aluminium titanates coat of 0.3 ~ 0.5 millimeter;
(7) the sprue bushing body that comprises aluminum titanate coatings step (6) being obtained is placed in stove 1450 DEG C ~ 1650 DEG C sintering 2 ~ 6 hours, obtains final products.
Described alumina raw material powder is α type, and titanium dioxide raw meal is Detitanium-ore-type or rutile-type, and aluminium oxide and titanium dioxide powder particle diameter are all less than 3 μ m.
Described stabilizing agent is SiO
2, MgO, Fe
2o
3, CeO
2in the mixture of optional three kinds.
The invention has the beneficial effects as follows: 1, bush body is aluminium oxide and aluminium titanates composite pottery, compared with steel sprue bushing, can reduce its thermal coefficient of expansion, solve the cold problem of falling occurring in casting process and improve castability; Compared with pure alumina titanate ceramics sprue bushing, improve intensity (the about 20MPa of pure alumina titanate ceramics sprue bushing bending strength of lining, the bending strength of this lining is more than 40 Mpa), solve in the time of foundry goods pickup pure aluminium titanates sprue bushing easily by the problem of collision brittle failure, long service life; 2, the coat of lining is alumina titanate ceramics coating, has met with metal liquid and has not infiltrated, and resistance to etch, anti-slag, does not pollute foundry goods, the performance requirement such as heat conduction is slow, anti-thermal shock.
Brief description of the drawings
Fig. 1 is the structural representation of the ceramic sprue bushing of aluminum alloy low-pressure casting of the present invention.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is further described.
The ceramic sprue bushing of this aluminum alloy low-pressure casting, lining is shaped as tubular, and it comprises bush body 1 and coat 2, and the coated layer of described bush body covers, and described bush body is aluminium oxide and aluminium titanates composite pottery; Described coat is alumina titanate ceramics, and it is as follows that it makes embodiment:
Embodiment 1
(1) be first that the titanium dioxide material powder that the alpha-aluminium oxide raw meal of 2.5 μ m is 0.5 μ m with Detitanium-ore-type or rutile-type particle diameter (D98) mixes according to weight ratio 1.1:1 by particle diameter (D98), add weight fraction is 2% SiO simultaneously
2, 2% MgO and 2% CeO
2three kinds of stabilizing agents, fully mix;
(2) powder step (1) being obtained is milled to after 2.5 hours below 5 μ m 1380 DEG C of roastings, sieves and obtains aluminium titanates powder;
(3) metatitanic acid aluminium powder step (2) being obtained joins in alumina raw material powder and fully mixes by 6% weight fraction, obtains mixed powder;
(4) in mixed powder step (3) being obtained, add compressing after PVA glue and water mixing granulation after 1100 DEG C of presintering 2 hours, obtain presintering body;
(5) metatitanic acid aluminium powder step (2) being obtained and PVA glue and pure water are made into slurry, and weight fraction is: aluminium titanates content is that 30%, PVA glue content is 20%, pure water 50%;
(6) sprue bushing presintering body step (4) being obtained is placed in the aluminium titanates slurry several seconds of (5) arrangements of steps and takes out and dry or dry, and repeats 5 times, makes surface produce the aluminium titanates coat of approximately 0.5 millimeter;
(7) sprue bushing that comprises aluminum titanate coatings step (6) being obtained is placed in stove 1600 DEG C of sintering 4 hours, obtains final products.
Embodiment 2
(1) be first that the titanium dioxide material powder that the alpha-aluminium oxide raw meal of 2.5 μ m is 0.5 μ m with Detitanium-ore-type particle diameter (D98) mixes according to weight ratio 1.1:1 by particle diameter (D98), add weight fraction is 2.5% SiO simultaneously
2, 2.5% MgO and 2.5% Fe
2o
3three kinds of stabilizing agents, fully mix;
(2) powder step (1) being obtained is milled to after 2.5 hours below 5 μ m 1380 DEG C of roastings, sieves and obtains aluminium titanates powder;
(3) metatitanic acid aluminium powder step (2) being obtained joins in alumina raw material powder and fully mixes by 8% weight fraction, obtains mixed powder;
(4) in mixed powder step (3) being obtained, add compressing after PVA glue and water mixing granulation after 1100 DEG C of presintering 2 hours, obtain presintering body;
(5) metatitanic acid aluminium powder step (2) being obtained and PVA glue and pure water are made into slurry, and weight fraction is: aluminium titanates powder content is that 30%, PVA glue content is 20%, pure water 50%;
(6) sprue bushing presintering body step (4) being obtained is placed in the aluminium titanates slurry several seconds of (5) arrangements of steps and takes out and dry or dry, and repeats 3 times, makes surface produce the aluminium titanates coat of approximately 0.3 millimeter;
(7) sprue bushing that comprises aluminum titanate coatings step (6) being obtained is placed in stove 1600 DEG C of sintering 4 hours, obtains final products.
Embodiment 3
(1) be first that the titanium dioxide material powder that the alpha-aluminium oxide raw meal of 2.5 μ m is 0.5 μ m with Detitanium-ore-type particle diameter (D98) mixes according to weight ratio 1.1:1 by particle diameter (D98), add weight fraction is 3% SiO simultaneously
2, 3% MgO and 3% Fe
2o
3three kinds of stabilizing agents, fully mix;
(2) powder step (1) being obtained is milled to after 2.5 hours below 5 μ m 1380 DEG C of roastings, sieves and obtains aluminium titanates powder;
(3) metatitanic acid aluminium powder step (2) being obtained joins in alumina raw material powder and fully mixes by 11% weight fraction, obtains mixed powder;
(4) in mixed powder step (3) being obtained, add compressing after PVA glue and water mixing granulation after 1100 DEG C of presintering 2 hours, obtain presintering body;
(5) metatitanic acid aluminium powder step (2) being obtained and PVA glue and pure water are made into slurry, and weight fraction is: aluminium titanates content is that 30%, PVA glue content is 20%, pure water 50%;
(6) sprue bushing presintering body step (4) being obtained is placed in the aluminium titanates slurry several seconds of (5) arrangements of steps and takes out and dry or dry, and repeats 3 times, makes surface produce the aluminium titanates coat of approximately 0.3 millimeter;
(7) sprue bushing that comprises aluminum titanate coatings step (6) being obtained is placed in stove 1600 DEG C of sintering 4 hours, obtains final products.
Embodiment 4
(1) be first that the titanium dioxide material powder that the alpha-aluminium oxide raw meal of 2.5 μ m is 0.5 μ m with Detitanium-ore-type particle diameter (D98) mixes according to weight ratio 1.1:1 by particle diameter (D98), add weight fraction is 3.5% SiO simultaneously
2, 3.5% MgO and 3.5% CeO
2three kinds of stabilizing agents, fully mix;
(2) powder step (1) being obtained is milled to after 2.5 hours below 5 μ m 1380 DEG C of roastings, sieves and obtains aluminium titanates powder;
(3) metatitanic acid aluminium powder step (2) being obtained joins in alumina raw material powder and fully mixes by 12.5% weight fraction, obtains mixed powder;
(4) in mixed powder step (3) being obtained, add compressing after PVA glue and pure water mixing granulation after 1100 DEG C of presintering 2 hours, obtain presintering body; ;
(5) metatitanic acid aluminium powder step (2) being obtained and PVA glue and water are made into slurry, and weight fraction is: aluminium titanates content is that 30%, PVA glue content is 20%, pure water 50%;
(6) sprue bushing presintering body step (4) being obtained is placed in the aluminium titanates slurry several seconds of (5) arrangements of steps and takes out and dry or dry, and repeats 5 times, makes surface produce the aluminium titanates coat of approximately 0.5 millimeter;
(7) sprue bushing that comprises aluminum titanate coatings step (6) being obtained is placed in stove 1600 DEG C of sintering 4 hours, obtains final products.
The performance of above four embodiment products is as shown in the table:
The life-span of product exceedes 72 hours for qualified.
Claims (5)
1. the ceramic sprue bushing of aluminum alloy low-pressure casting, described ceramic sprue bushing be shaped as tubular, it is characterized in that: described ceramic sprue bushing comprises bush body 1 and coat 2, the coated layer of described bush body covers, described bush body is the composite pottery of aluminium oxide and aluminium titanates, and described coat is alumina titanate ceramics.
2. the ceramic sprue bushing of aluminum alloy low-pressure casting according to claim 1, its preparation method is as follows:
One, first alumina raw material powder and titanium dioxide material powder are mixed to get to original washing powder according to weight ratio 1.1 ~ 1.3:1, in described original washing powder, to add weight fraction be 6 ~ 10.5% stabilizing agent and fully mix;
Two, powder step 1 being obtained is milled to after 1.5 ~ 4 hours below 5 μ m 1350 DEG C ~ 1400 DEG C roastings, sieves and obtains aluminium titanates powder;
Three, metatitanic acid aluminium powder step 2 being obtained joins in alumina raw material powder and fully mixes by 6% ~ 13% weight fraction, obtains mixed powder;
Four, in mixed powder step 3 being obtained, add after PVA glue and water mixing granulation compressingly, then 1000 DEG C ~ 1300 DEG C presintering, obtain the presintering body of bush body;
Five, metatitanic acid aluminium powder step 2 being obtained and PVA glue and pure water are made into slurry, and weight fraction is: aluminium titanates content is that 20% ~ 75%, PVA glue content is 20% ~ 50%, and all the other are pure water;
Six, sprue bushing presintering body step 4 being obtained is placed in the aluminium titanates slurry several seconds that step 5 configures and takes out and dry or dry, and repeats for several times, makes surface produce the aluminium titanates coat of 0.3 ~ 0.5 millimeter;
Seven, the sprue bushing presintering body that comprises aluminum titanate coatings step 6 being obtained is placed in stove 1450 DEG C ~ 1650 DEG C sintering 2 ~ 6 hours, obtains final products.
3. preparation method according to claim 2, is characterized in that: be that its particle diameter of α type is about 2.5 μ m at alumina raw material powder described in step 1, titanium dioxide raw meal is that Detitanium-ore-type or its particle diameter of rutile-type are about 0.5 μ m.
4. preparation method according to claim 2, is characterized in that: be SiO at the stabilizing agent described in step 1
2, MgO, Fe
2o
3, CeO
2in the mixture of optional three kinds.
5. preparation method according to claim 2, is characterized in that: be that weight fraction is 2.5% SiO at the stabilizing agent described in step 1
2, 2.5% MgO and 2.5% Fe
2o
3mixture; Join in alumina raw material powder by 8% weight fraction at the metatitanic acid aluminium powder described in step 3.
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Cited By (5)
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| CN104528817A (en) * | 2015-02-06 | 2015-04-22 | 淄博硅元泰晟陶瓷新材料有限公司 | Aluminum titanate powder and preparation method thereof |
| CN106238707A (en) * | 2016-09-18 | 2016-12-21 | 天津立中汽车铝合金配件有限公司 | A kind of plating pottery sprue bush |
| CN106493304A (en) * | 2016-10-18 | 2017-03-15 | 大亚车轮制造有限公司 | The preparation method of the metal sprue bush containing ceramic coating |
| CN110357617A (en) * | 2018-04-11 | 2019-10-22 | 淄博松阳锆业科技有限公司 | A kind of novel wear resistant erosion resistant foundry ceramic lift tube and its production technology |
| CN114160774A (en) * | 2021-12-03 | 2022-03-11 | 无锡锡南科技股份有限公司 | Low-pressure die for large-scale new energy gearbox shell |
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| CN110357617A (en) * | 2018-04-11 | 2019-10-22 | 淄博松阳锆业科技有限公司 | A kind of novel wear resistant erosion resistant foundry ceramic lift tube and its production technology |
| CN114160774A (en) * | 2021-12-03 | 2022-03-11 | 无锡锡南科技股份有限公司 | Low-pressure die for large-scale new energy gearbox shell |
| CN114160774B (en) * | 2021-12-03 | 2023-09-19 | 无锡锡南科技股份有限公司 | Large new energy gearbox housing low-pressure die |
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Effective date of registration: 20210915 Address after: 215300 industrial concentration zone, Jiangduo Town, Jiangyan District, Taizhou City, Jiangsu Province Patentee after: JIANGSU HIGH-XIN HIGH-TEMPERATURE NEW MATERIALS TECHNOLOGY Co.,Ltd. Address before: 225534 Taizhou Wangxin refractory Co., Ltd., industrial concentration zone, Jiangduo Town, Jiangyan District, Taizhou City, Jiangsu Province Patentee before: TAIZHOU CITY WANGXIN REFRACTORY MATERIAL Co.,Ltd. |