CN101116893A - Accurate casting powder - Google Patents
Accurate casting powder Download PDFInfo
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- CN101116893A CN101116893A CNA2007100523786A CN200710052378A CN101116893A CN 101116893 A CN101116893 A CN 101116893A CN A2007100523786 A CNA2007100523786 A CN A2007100523786A CN 200710052378 A CN200710052378 A CN 200710052378A CN 101116893 A CN101116893 A CN 101116893A
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Abstract
The invention belongs to a precision cast material, in particular to a precision cast powder, and is characterized in that: the precision casting powder is a mixture of quartz powder, cristobalite powder, fused silica, antifoam agent, dispersant agent, high temperature stabilizing agent and coagulant agent. The weight percentages of these crude materials as follows: quartz powder takes up 43.9-93.7 percent, cristobalite powder 2-10 percent, fused silica 3-40 percent, antifoam agent 0.1-1percent, dispersant agent 0.05-0.1 percent, high temperature stabilizing agent 1-4 percent, and coagulant agent 0.1-1 percent. In order to use the precision casting powder, water and liquid-containing binder are added into the precision casting powder, the weight of the added water is 36-42 percent of that of the precision casting powder. The proportion between the liquid-containing binder addition and the water addition is 1:18-20. The invention has the advantages of stable performance and lower cost, and is suitable for high-melting metal or alloy like platino and non-rust steel.
Description
Technical field
The invention belongs to the hot investment casting field, relate generally to a kind of lost-wax casting material that is used for refractory metals such as noble metal jewelry, handicraft and stainless steel parts, alloy.
Background technology
Accurate casting powder is a kind of special investment mo(u)ld material, originally is mainly used in the casting of noble metal jewelries such as Ya Mo and platinum, karat gold, silver, artwork Ornament, also expands to the casting of stainless steel and various alloy precision parts afterwards.Because the particularity of its purposes has determined the accurate casting powder quality requirement very high.
Accurate casting powder is different according to composition and purposes, can be divided into gypsum casting powder and platinum casting powder usually.Gypsum casting powder is owing to contain a certain amount of gypsum, and gypsum thermal decomposition will take place and lost strength between 1200～1300 ℃, thereby can only be used for the casting of low-melting-point metal such as karat gold, silver, copper or alloy; The main component of platinum casting powder is SiO
2So its intensity is good, can be high temperature resistant, be applicable to the hot investment casting of refractory metals such as platinum, iridium, stainless steel or alloy.Because the value of noble metal itself is very expensive, this just requires to cast used accurate casting powder must be perfect as much as possible, and high yield rate, accuracy to size and extremely low product defects be arranged, and reduces the refining losses of subsequent handling as far as possible.
Because the product quality of accurate casting powder requires very harsh, its technology of preparing is monopolized by major company of external several family always, and the medium-to-high grade accurate casting powder on the domestic market almost all comes from foreign producer.And from domestic disclosed at present data, about accurate casting powder research report (document and patent) particularly also seldom, what can see all is very simply to introduce, and does not see complete report clearly.Below be the report of relevant casting powder in the Chinese invention patent:
Chinese patent 94107410.2 is mentioned a kind of land plaster prescription: semi-hydrated gypsum 20～24%, cristobalite 12.3～29.2%, quartz 46.71～65.4%, set retarder or coagulant 0.05～0.15%, surfactant 0.01～0.03%, defoamer 0.01～0.05%.Be applicable to handicrafts such as casting gold silver jewellery.
Chinese patent 00119619.7 is mentioned a kind of intumescent gypsum casting powder and paste-making method by using water thereof, its set of dispense than (mass fraction) is: alpha gypsum powder 28%～38%, cristobalite powder 0～29%, silica flour 30%～70%, additive A 0.3%～0.8%, additive B 0.8%～1.2%, addition of C 0.9%～1.1%, wherein additive A is a kind of high-molecular organic material, for example hydroxyethylcellulose, modification dextrin, polyvinyl alcohol etc.; Additive B is a kind of inorganic material, for example various silicate, aluminosilicate, calcium aluminate etc., and addition of C is the gelling time controlling agent.Can be used for casting karat gold and alloy.To cast cast(ing) surface bright and clean, do not have joint flash, splashings substantially.
Chinese patent 97108121.2 is mentioned a kind of precision investment casting powder: semi-hydrated gypsum 15～25%, quartzy 70～90%.Can be applicable to the casting of metal, alloy and Precision Machinery Elements.
Chinese patent 95106974.8 has been introduced the expansion gypsum type material and the manufacture craft of the modelling of a kind of casting and pressure processing, and its material fundamental component is a gypsum 35～45%, alumina cement 15～25%, the quartzy and wollastonite 30～50% of additive; Adding water during allotment is 40～60% of fundamental component, and the swelling agent gelatin is 0.1～6% of a fundamental component.
All used gypsum in the main material of these patents, belonged to gypsum mould casting powder, can only be used for the casting of low-melting-point metal or alloy, and described method all compare roughly, also do not reach the required precision of casting noble metal jewelry and precision parts.
That mentions the accurate casting powder technology of preparing that is used to cast refractory metal in the Chinese patent has only patent 99100268.7,200510088358.5 and 200510019444.0.
Wherein patent 99100268.7 is mentioned a kind of model casting mold material: refractory material (comprises Al
2O
3, SiO
2, MgO, mullite, SiC, SiN) 50～80%, solubility inorganic matter (barium hydroxide, sodium chloride, sodium phosphate, calcium monohydrogen phosphate, aluminum phosphate, potash, sodium carbonate, sodium aluminate, magnesium sulfate) or organic matter (polyvinyl alcohol, starch, dextrin, cellulose and alginate) 1～5%, water 19～45% can be used for the noble metal casting.But through evidence, this patent formulation is too extensive, fuzzy, can't reach the hot investment casting requirement.
Patent 200510088358.5 is mentioned a kind of preparation method of quartz cast powder for precision casting, its prescription consists of: silica flour and high quartz powder mixture account for 50.9%～99.9%, solid binder (phosphoric acid salt) accounts for 0.1%～17%, high-temperature stabiliser accounts for 0～18%, defoamer accounts for 0～5%, coagulating agent accounts for 0～13%, can be used for the casting of refractory metals such as noble metal, stainless steel or alloy.But also there is the general excessively problem of raw material range of choice in this patent, and does not offer some clarification on the kind and the calcinating system of high quartz, does not also have to indicate the ratio of it and silica flour, describes accurately inadequately, and the reader is difficult to realize the casting effect described in the patent.
Patent 200510019444.0 has been mentioned a kind of casting powder and using method thereof that is used for casting high melting point metal.Casting powder in the patent is made up of pressed powder and liquid quick dry agent two parts, and pressed powder comprises silica flour and high quartz powder (3～30%), and the liquid quick dry agent comprises binding agent (23～92.3%), surfactant (0～38.5%) and water (0～77%).Liquid quick dry agent in this patent needs formulated, uses inconvenient.And surfactant (silane, glycerine) stays stain at cast(ing) surface easily, influences attractive in appearance.
Summary of the invention
The object of the present invention is to provide a kind of stable performance, cost lower, be suitable for dystectic accurate casting powder.
To achieve these goals, technical scheme of the present invention is: a kind of accurate casting powder, it is characterized in that it mixes accurate casting powder (mixed powder) by silica flour, cristobalite powder, vitreous silica, defoamer, dispersant, high-temperature stabiliser and coagulant raw material, the shared percentage by weight of each raw material is: silica flour 43.9～93.75%, cristobalite powder 2～10%, vitreous silica 3～40%, defoamer 0.1～1%, dispersant 0.05～0.1%, high-temperature stabiliser 1～4%, coagulant 0.1～1%; During use, add water, liquid-containing binder, the addition of water is 36～42% of an accurate casting powder weight, and liquid-containing binder addition and amount of water ratio are 1: 18～20.
Composition is as follows in detail:
(1) material of main part: silica flour, cristobalite powder and fused quartz powder are material of main parts of the present invention, and they constitute the skeleton of shell, are main refractory materials.Wherein, silica flour is that natural siliceous sand or silicalite obtain behind sorting, purification, dry ball milling, granularity 400～600 orders; Cristobalite powder is that quartz raw material ball milling after 1 500 ℃ of high-temperature calcinations is obtained, and granularity requirements is at 600～800 orders; Vitreous silica be with quartz raw material cooling fast after 1750 ℃ of high-temperature fusion, ball milling obtains, granularity requirements is at 800～1000 orders.All require for silica flour, cristobalite powder, fused quartz powder: SiO
2Mass content is greater than 99.5%; Psephicity is good, and particle is near circular.
(2) defoamer: the SN-DEFOAMER 14HP that defoamer of the present invention adopts Japanese SANNOPCO company to produce.
(3) dispersant: dispersant of the present invention adopts tannic acid.
(4) high-temperature stabiliser: high-temperature stabiliser of the present invention adopts zirconia.
(5) coagulant: coagulant of the present invention adopts potassium sulfate.
Defoamer, dispersant, high-temperature stabiliser, coagulant all are Powdered, cross 100 mesh sieves.
(6) liquid-containing binder: the used liquid-containing binder of the present invention is the liquid phosphoric acid aluminum dihydrogen, and is bottled separately, is used with accurate casting powder (mixed powder).The amount of water of its addition during according to practical operation decided, and ratio general and amount of water is 1: 18～20.
The using method of above-mentioned a kind of accurate casting powder:
1) be by weight percentage: silica flour 43.9～93.75%, cristobalite powder 2～10%, vitreous silica 3～40%, defoamer 0.1～1%, dispersant 0.05～0.1%, high-temperature stabiliser 1～4%, coagulant 0.1～1% are chosen silica flour, cristobalite powder, vitreous silica, defoamer, dispersant, high-temperature stabiliser and coagulant, mixing and stirring gets accurate casting powder (mixed powder);
2) addition by water is 36～42% (relevant with humidity with air themperature) of accurate casting powder weight, and liquid-containing binder addition and amount of water ratio are 1: 18～20, choose water, liquid-containing binder;
3) accurate casting powder adds the water stirring, adds the liquid binding agent again; Follow-up specific operation process is consistent with existing factory routine operation.
Main component of the present invention is common silica flour, cristobalite powder and fused quartz powder, and raw material is cheap, be easy to get; And processing is simple, need not complicated technology and equipment, and cost is lower.Simultaneously, added zirconia among the present invention, it can significantly increase the elevated temperature strength and the high temperature shock resistance of shell, has improved the yield rate of product.In addition, the present invention adopts quartz, does not add gypsum, thereby applicable to the casting of refractory metal and alloy.
Beneficial effect of the present invention is: stable performance, cost are lower, are particularly suitable for casting refractory metal or alloys such as platinum, stainless steel, and be easy to use.The foundry goods of producing is smooth, smooth, attractive in appearance, the accuracy to size height, and defective is few, and yield rate is greater than 95% (and the similar products at home and abroad yield rate only is 45～75%).
The specific embodiment
In order to understand the present invention better, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to the following examples.
Embodiment 1:
A kind of accurate casting powder, the component prescription is as follows: silica flour 467 grams, cristobalite powder 70g, fused quartz powder 140g; 14HP3.5g, tannic acid 0.5g, zirconia 14g, potassium sulfate 5g with above-mentioned pressed powder mixing and stirring, gets accurate casting powder.
Silica flour is that natural siliceous sand or silicalite obtain behind sorting, purification, dry ball milling, granularity 400～600 orders; Cristobalite powder is that quartz raw material ball milling after 1500 ℃ of high-temperature calcinations is obtained, and granularity requirements is at 600～800 orders; Vitreous silica be with quartz raw material cooling fast after 1750 ℃ of high-temperature fusion, ball milling obtains, granularity requirements is at 800～1000 orders.All require for silica flour, cristobalite powder, fused quartz powder: SiO
2Mass content is greater than 99.5%; Psephicity is good, and particle is near circular.(annotating: identical) about silica flour, cristobalite powder, fused quartz powder following examples.
SN-DEFOAMER 14HP, tannic acid, zirconia and potassium sulfate that Japan SANNOPCO company produces all are Powdered, cross 100 mesh sieves.(annotate: following examples are identical).
During use, be 40% of accurate casting powder weight by the addition of water, liquid-containing binder addition and amount of water ratio are 1: 19, choose water, liquid-containing binder, and used liquid-containing binder is liquid phosphoric acid aluminum dihydrogen (following examples is identical); Accurate casting powder adds water and stirs, and adds the liquid binding agent again; Follow-up specific operation process is consistent with existing factory routine operation.
Embodiment 2:
A kind of accurate casting powder, the component prescription is as follows: silica flour 325.3 grams, cristobalite powder 70g, fused quartz powder 280g; 14HP7g, tannic acid 0.7g, zirconia 10g, potassium sulfate 7g with above-mentioned pressed powder mixing and stirring, gets accurate casting powder.
During use, be 40% of accurate casting powder weight by the addition of water, liquid-containing binder addition and amount of water ratio are 1: 19, choose water, liquid-containing binder; Accurate casting powder adds water and stirs, and adds the liquid binding agent again; Follow-up specific operation process is consistent with existing factory routine operation.
Embodiment 3:
A kind of accurate casting powder, the component prescription is as follows: silica flour 626.8 grams, cristobalite powder 15g, fused quartz powder 22g; 14HP3.5g, tannic acid 0.7g, zirconia 25g, potassium sulfate 7g with above-mentioned pressed powder mixing and stirring, gets accurate casting powder.
During use, be 40% of accurate casting powder weight by the addition of water, liquid-containing binder addition and amount of water ratio are 1: 19, choose water, liquid-containing binder; Accurate casting powder adds water and stirs, and adds the liquid binding agent again; Follow-up specific operation process is consistent with existing factory routine operation.
Embodiment 4:
A kind of accurate casting powder, the component prescription is as follows: silica flour 475.6 grams, cristobalite powder 50g, fused quartz powder 150g; 14HP1g, tannic acid 0.4g, zirconia 20g, potassium sulfate 3g with above-mentioned pressed powder mixing and stirring, gets accurate casting powder.
During use, be 36% of accurate casting powder weight by the addition of water, liquid-containing binder addition and amount of water ratio are 1: 18, choose water, liquid-containing binder; Accurate casting powder adds water and stirs, and adds the liquid binding agent again; Follow-up specific operation process is consistent with existing factory routine operation.
Embodiment 5:
A kind of accurate casting powder, the component prescription is as follows: silica flour 542.8 grams, cristobalite powder 70g, fused quartz powder 70g; 14HP0.8g, tannic acid 0.4g, zirconia 15g, potassium sulfate 1g with above-mentioned pressed powder mixing and stirring, gets accurate casting powder.
During use, be 42% of accurate casting powder weight by the addition of water, liquid-containing binder addition and amount of water ratio are 1: 20, choose water, liquid-containing binder; Accurate casting powder adds water and stirs, and adds the liquid binding agent again; Follow-up specific operation process is consistent with existing factory routine operation.
Embodiment 6:
1) be by weight percentage: silica flour 93.75%, cristobalite powder 2%, vitreous silica 3%, defoamer 0.1%, dispersant 0.05%, high-temperature stabiliser 1%, coagulant 0.1% are chosen silica flour, cristobalite powder, vitreous silica, defoamer, dispersant, high-temperature stabiliser and coagulant, mixing and stirring gets accurate casting powder (mixed powder); The SN-DEFOAMER 14HP that defoamer adopts Japanese SANNOPCO company to produce, dispersant adopts tannic acid, and high-temperature stabiliser adopts zirconia, and coagulant adopts potassium sulfate; Defoamer, dispersant, high-temperature stabiliser, coagulant are Powdered, cross 100 mesh sieves.
2) addition by water is 36% of an accurate casting powder weight, and liquid-containing binder addition and amount of water ratio are 1: 18, choose water, liquid-containing binder.
3) accurate casting powder adds the water stirring, adds the liquid binding agent again; Follow-up specific operation process is consistent with existing factory routine operation.
Embodiment 7:
1) be by weight percentage: silica flour 43.9%, cristobalite powder 10%, vitreous silica 40%, defoamer 1% powder 0.1%, high-temperature stabiliser 4%, coagulant 1% are chosen silica flour, cristobalite powder, vitreous silica, defoamer, dispersant, high-temperature stabiliser and coagulant, mixing and stirring gets accurate casting powder (mixed powder); The SN-DEFOAMER 14HP that defoamer adopts Japanese SANNOPCO company to produce, dispersant adopts tannic acid, and high-temperature stabiliser adopts zirconia, and coagulant adopts potassium sulfate; Defoamer, dispersant, high-temperature stabiliser, coagulant are Powdered, cross 100 mesh sieves.
2) addition by water is 42% of an accurate casting powder weight, and liquid-containing binder addition and amount of water ratio are 1: 20, choose water, liquid-containing binder.
3) accurate casting powder adds the water stirring, adds the liquid binding agent again; Follow-up specific operation process is consistent with existing factory routine operation.
Claims (3)
1. accurate casting powder, it is characterized in that it mixes accurate casting powder by silica flour, cristobalite powder, vitreous silica, defoamer, dispersant, high-temperature stabiliser and coagulant raw material, the shared percentage by weight of each raw material is: silica flour 43.9～93.75%, cristobalite powder 2～10%, vitreous silica 3～40%, defoamer 0.1～1%, dispersant 0.05～0.1%, high-temperature stabiliser 1～4%, coagulant 0.1～1%; During use, add water, liquid-containing binder, the addition of water is 36～42% of an accurate casting powder weight, and liquid-containing binder addition and amount of water ratio are 1: 18～20.
2. a kind of accurate casting powder according to claim 1 is characterized in that: described silica flour is that natural siliceous sand or silicalite obtain behind sorting, purification, dry ball milling, granularity 400～600 orders; Cristobalite powder is that quartz raw material ball milling after 1500 ℃ of high-temperature calcinations is obtained, and granularity requirements is at 600～800 orders; Vitreous silica be with quartz raw material cooling fast after 1750 ℃ of high-temperature fusion, ball milling obtains, granularity requirements is at 800～1000 orders; All require for silica flour, cristobalite powder, vitreous silica: SiO
2Mass content is greater than 99.5%.
3. a kind of accurate casting powder according to claim 1 is characterized in that: the SN-DEFOAMER14HP that defoamer adopts Japanese SAN NOPCO company to produce, and dispersant adopts tannic acid, and high-temperature stabiliser adopts zirconia, and coagulant adopts potassium sulfate; Defoamer, dispersant, high-temperature stabiliser, coagulant are Powdered, cross 100 mesh sieves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100523786A CN100469489C (en) | 2007-06-04 | 2007-06-04 | Accurate casting powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100523786A CN100469489C (en) | 2007-06-04 | 2007-06-04 | Accurate casting powder |
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| Publication Number | Publication Date |
|---|---|
| CN101116893A true CN101116893A (en) | 2008-02-06 |
| CN100469489C CN100469489C (en) | 2009-03-18 |
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ID=39053239
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100523786A Expired - Fee Related CN100469489C (en) | 2007-06-04 | 2007-06-04 | Accurate casting powder |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102773406A (en) * | 2012-07-26 | 2012-11-14 | 汉川市石金科技有限公司 | Refractory aggregate of casting coating recycled from old shell powder through investment casting |
| CN103586398A (en) * | 2013-11-27 | 2014-02-19 | 吴江市液铸液压件铸造有限公司 | Casting technology of stainless steel casting |
| CN105710287A (en) * | 2016-05-10 | 2016-06-29 | 天津泽希矿产加工有限公司 | Investment casting shell coating and method for manufacturing shell surface with same |
| CN109822040A (en) * | 2017-11-23 | 2019-05-31 | 宁夏共享化工有限公司 | A kind of two-component water hardening temperature core box binder |
| CN113929473A (en) * | 2021-10-29 | 2022-01-14 | 康硕(德阳)智能制造有限公司 | Preparation process of 3D printing quartz sand |
-
2007
- 2007-06-04 CN CNB2007100523786A patent/CN100469489C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102773406A (en) * | 2012-07-26 | 2012-11-14 | 汉川市石金科技有限公司 | Refractory aggregate of casting coating recycled from old shell powder through investment casting |
| CN103586398A (en) * | 2013-11-27 | 2014-02-19 | 吴江市液铸液压件铸造有限公司 | Casting technology of stainless steel casting |
| CN105710287A (en) * | 2016-05-10 | 2016-06-29 | 天津泽希矿产加工有限公司 | Investment casting shell coating and method for manufacturing shell surface with same |
| CN109822040A (en) * | 2017-11-23 | 2019-05-31 | 宁夏共享化工有限公司 | A kind of two-component water hardening temperature core box binder |
| CN109822040B (en) * | 2017-11-23 | 2020-10-16 | 宁夏共享化工有限公司 | Two-component water hardening warm core box binder |
| CN113929473A (en) * | 2021-10-29 | 2022-01-14 | 康硕(德阳)智能制造有限公司 | Preparation process of 3D printing quartz sand |
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| Publication number | Publication date |
|---|---|
| CN100469489C (en) | 2009-03-18 |
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