CN104128556A - Easily removable and collapsible inorganic ceramic core - Google Patents
Easily removable and collapsible inorganic ceramic core Download PDFInfo
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- CN104128556A CN104128556A CN201410224747.5A CN201410224747A CN104128556A CN 104128556 A CN104128556 A CN 104128556A CN 201410224747 A CN201410224747 A CN 201410224747A CN 104128556 A CN104128556 A CN 104128556A
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Abstract
The invention discloses an easily removable and collapsible inorganic ceramic core, which is characterized by being composed of the following raw materials by weight: 7-12wt% of a mineralizing agent, 12-20wt% of a plasticizer, 3-4wt% of calcium chloride, and the balance rare earth coated silicon oxide powder. By adding calcium chloride and rare earth to the core provided by the invention for treatment, the high temperature deflection and strength of a shell can be improved so as to control deformation of the shell under high temperature, thus ensuring acquisition of dimensionally qualified products. Calcium chloride can release heat after encountering water, and is easy to collapse, thus accelerating core removal.
Description
Technical field
The present invention relates generally to hot investment casting field, relates in particular to the defeated and dispersed ceramic core of a kind of inorganic easy depoling.
Background technology
The complicated inner cavity of alloy-steel casting is mainly by carrying out moulding with prefabricated ceramic core, and after foundry goods is cast, manages to remove.Its technological process is as follows: Tao Xin prepares, contains wax-pattern preparation, shell processed, shell dewaxing and roasting, alloy casting, the depoling of Tao Xin.As everyone knows, along with the startup of China's development large aircraft project and various new work engine research and development program elements, the body of titanium alloy precision casting, structure and performance thereof are had higher requirement.
At present, research is silica, silica-based ceramic core comparatively widely, because core material does not possess, the good chemical reaction inertia of molten titanium alloy and depoling complex process is not difficult to be applied to titanium alloy fine casting field.Because boron nitride and molten titanium alloy at high temperature have higher chemical reaction inertia, and the good high-temperature creep resistance of tool, boron nitride is a kind of aggregate of ceramic core for titanium alloy fine casting that is well suited for being used as.Caused in recent years related scientific research personnel's concern, as the Chinese invention patent application of publication number 200610028168.9 discloses a kind of preparation method of the boron nitride ceramic shell for titanium or titanium alloy hot investment casting, in this invention, adopting boron nitride powder and acetic acid zirconium thereof or Ludox is that binding agent is made painting slip.Because the shape of titanium alloy becomes increasingly complex, present titanium alloy casting is often with complicated inner cavity, and this integrality that requires core to possess good high-temperature creep resistance and then assurance shape in titanium alloy casting process is also had higher requirement to the performance that removes to core simultaneously.But boron nitride stable chemical performance removes and has brought certain difficulty especially for complex-shaped core, to be difficult to remove with mechanical means to core.In order to improve the depoling performance of core, type silicon oxide core material also receives related scientific research personnel's concern, as the Chinese invention patent application of CN 102531648 A discloses silica matrices ceramic core and preparation method for a kind of Ti alloy casting, due to comparatively complicated in titanium alloy precision casting technique, the duration of pouring that is prepared into alloy from the wax-pattern containing Tao Xin 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.
Summary of the invention
The object of the invention is just to provide the defeated and dispersed ceramic core of a kind of inorganic easy depoling.
The present invention is achieved by the following technical solutions:
The defeated and dispersed ceramic core of inorganic easy depoling, is characterized in that what it was comprised of the raw material of following weight percentage:
Mineralizer 7-12wt%, plasticizer 12-20 wt%, calcium chloride 3-4 wt %, surplus are the coated silica powder of rare earth;
Described mineralizer be a kind of in zirconium English powder, mullite powder, magnesia or two kinds and more than, with any mass ratio, mixes and form, and fineness is 50-200 μ m;
Described plasticizer is comprised of the raw material of following weight parts:
Paraffin 80-90, propolis 3-4, terpene resin 4-5, PEO 1-2, Silane coupling agent KH550 0.1-0.2;
By above-mentioned terpene resin thermoplastic, add PEO, after stirring, add each raw material of residue, 600-800 rev/min of dispersed with stirring 4-6 minute, cooling discharging, obtains described plasticizer;
The preparation method of the described coated silica of rare earth comprises the following steps:
(1) select the silica powder of 60-150 μ m granularity;
(2) sodium chloride, calcium chloride are mixed with silica powder, add the water of compound weight 30-40%, the even post-drying of ball milling, obtains basic powder;
(3) inorganic zirconates and inorganic yttrium salts are usingd to any ratio and mix as rare earth oxide presoma, take inorganic zirconates and inorganic yttrium salts and put into the container that fills deionized water and stir and heat and make precursor solution;
(4) above-mentioned basic powder is added in precursor solution, the pH value of regulator solution, to 8-10, obtains mixed liquor;
(5) above-mentioned mixed liquor is dried, obtain drying powder, oven dry powder is carried out to sintering and obtain the coated silica powder of rare earth, sintering temperature is 1200-1400 ℃, and the time is 0.5-20h.
The defeated and dispersed ceramic core of inorganic easy depoling, in the preparation of the described coated silica of rare earth, the described mixing quality of rare earth oxide presoma and the mass ratio of silica powder are 1:14-20.
The defeated and dispersed ceramic core of inorganic easy depoling, in the preparation of the described coated silica of rare earth, described inorganic zirconates is zirconium chloride or zirconium nitrate, described inorganic yttrium salts is yttrium chloride or yttrium nitrate.
The defeated and dispersed ceramic core of inorganic easy depoling, in the preparation of the described coated silica of rare earth, described rare earth oxide precursor solution, its concentration is 0.01-0.3mol/L.
The defeated and dispersed ceramic core of inorganic easy depoling, in the preparation of the described coated silica of rare earth, the mass ratio of described silica powder, sodium chloride, calcium chloride is 100:1:10-14.
A preparation method for the ceramic core that inorganic easy depoling is defeated and dispersed, comprises the following steps:
(1) take the coated 10-15% of silica powder body weight of above-mentioned rare earth, 3-5% and the calcium chloride of plasticizer weight mix, at 120-130 ℃, heating is uniformly mixed 10-20 minute, must expect a;
(2) batch mixer is heated to 120-140 ℃, add residue plasticizer, under stirring condition, add successively mineralizer, material a and remain each raw material, after adding, continue to be uniformly mixed 10-12 hour, carry out as requested moulding, sintering obtains the defeated and dispersed ceramic core of described inorganic easy depoling, and described sintering temperature is 1200-1500 ℃, and the time is 0.5-20h.
Advantage of the present invention is:
Core of the present invention, by adding calcium chloride and RE-treated, can improve high temperature amount of deflection and the intensity of shell, to control shell distortion at high temperature, guarantee to obtain the qualified product of size, and calcium chloride is met water can heat release, and easily defeated and dispersed, thereby accelerates depoling.
The specific embodiment
Embodiment 1
The defeated and dispersed ceramic core of inorganic easy depoling, is characterized in that what it was comprised of the raw material of following weight percentage:
Mineralizer 12wt%, plasticizer 20 wt%, calcium chloride 3 wt %, surplus are the coated silica powder of rare earth;
Described mineralizer is mullite powder, and fineness is 50-200 μ m;
Described plasticizer is comprised of the raw material of following weight parts:
Paraffin 90, propolis 3, terpene resin 4, PEO 1, Silane coupling agent KH550 0.2;
By above-mentioned terpene resin thermoplastic, add PEO, after stirring, add each raw material of residue, 800 revs/min of dispersed with stirring 4 minutes, cooling discharging, obtains described plasticizer;
The preparation method of the described coated silica of rare earth comprises the following steps:
(1) select the silica powder of 150 μ m granularities;
(2) sodium chloride, calcium chloride are mixed with silica powder, add the water of compound weight 40%, the even post-drying of ball milling, obtains basic powder;
(3) inorganic zirconates and inorganic yttrium salts are usingd to any ratio and mix as rare earth oxide presoma, take inorganic zirconates and inorganic yttrium salts and put into the container that fills deionized water and stir and heat and make precursor solution;
(4) above-mentioned basic powder is added in precursor solution, the pH value to 10 of regulator solution, obtains mixed liquor;
(5) above-mentioned mixed liquor is dried, obtain drying powder, oven dry powder is carried out to sintering and obtain the coated silica powder of rare earth, sintering temperature is 1400 ℃, and the time is 9h.
The defeated and dispersed ceramic core of inorganic easy depoling, in the preparation of the described coated silica of rare earth, the described mixing quality of rare earth oxide presoma and the mass ratio of silica powder are 1:14-20.
The defeated and dispersed ceramic core of inorganic easy depoling, in the preparation of the described coated silica of rare earth, described inorganic zirconates is zirconium chloride or zirconium nitrate, described inorganic yttrium salts is yttrium chloride or yttrium nitrate.
The defeated and dispersed ceramic core of inorganic easy depoling, in the preparation of the described coated silica of rare earth, described rare earth oxide precursor solution, its concentration is 0.3mol/L.
The defeated and dispersed ceramic core of inorganic easy depoling, in the preparation of the described coated silica of rare earth, the mass ratio of described silica powder, sodium chloride, calcium chloride is 100:1:14.
A preparation method for the ceramic core that inorganic easy depoling is defeated and dispersed, comprises the following steps:
(1) take the coated silica powder body weight of above-mentioned rare earth 15%, 3% and calcium chloride of plasticizer weight, mix, at 130 ℃, heating is uniformly mixed 20 minutes, must expect a;
(2) batch mixer is heated to 140 ℃, add residue plasticizer, under stirring condition, add successively mineralizer, material a and remain each raw material, after adding, continue to be uniformly mixed 12 hours, carry out as requested moulding, sintering obtains the defeated and dispersed ceramic core of described inorganic easy depoling, and described sintering temperature is 1500 ℃, and the time is 10h.
Performance test:
Room temperature bending strength 58MPa, high temperature amount of deflection (being incubated 30min at 1550 ℃) 0.48mm, percent of firing shrinkage 0.57%.
Claims (6)
1. the defeated and dispersed ceramic core of inorganic easy depoling, is characterized in that what it was comprised of the raw material of following weight percentage:
Mineralizer 7-12wt%, plasticizer 12-20 wt%, calcium chloride 3-4 wt %, surplus are the coated silica powder of rare earth;
Described mineralizer be a kind of in zirconium English powder, mullite powder, magnesia or two kinds and more than, with any mass ratio, mixes and form, and fineness is 50-200 μ m;
Described plasticizer is comprised of the raw material of following weight parts:
Paraffin 80-90, propolis 3-4, terpene resin 4-5, PEO 1-2, Silane coupling agent KH550 0.1-0.2;
By above-mentioned terpene resin thermoplastic, add PEO, after stirring, add each raw material of residue, 600-800 rev/min of dispersed with stirring 4-6 minute, cooling discharging, obtains described plasticizer;
The preparation method of the described coated silica powder of rare earth comprises the following steps:
(1) select the silica powder of 60-150 μ m granularity;
(2) sodium chloride, calcium chloride are mixed with silica powder, add the water of compound weight 30-40%, the even post-drying of ball milling, obtains basic powder;
(3) inorganic zirconates and inorganic yttrium salts are usingd to any ratio and mix as rare earth oxide presoma, take inorganic zirconates and inorganic yttrium salts and put into the container that fills deionized water and stir and heat and make precursor solution;
(4) above-mentioned basic powder is added in precursor solution, the pH value of regulator solution, to 8-10, obtains mixed liquor;
(5) above-mentioned mixed liquor is dried, obtain drying powder, oven dry powder is carried out to sintering and obtain the coated silica powder of rare earth, sintering temperature is 1200-1400 ℃, and the time is 0.5-20h.
2. the defeated and dispersed ceramic core of a kind of inorganic easy depoling according to claim 1, is characterized in that, in the preparation of the described coated silica powder of rare earth, the described mixing quality of rare earth oxide presoma and the mass ratio of silica powder are 1:14-20.
3. the defeated and dispersed ceramic core of a kind of inorganic easy depoling according to claim 1, is characterized in that, in the preparation of the described coated silica powder of rare earth, described inorganic zirconates is zirconium chloride or zirconium nitrate, and described inorganic yttrium salts is yttrium chloride or yttrium nitrate.
4. the defeated and dispersed ceramic core of a kind of inorganic easy depoling according to claim 1, is characterized in that, in the preparation of the described coated silica of rare earth, and described rare earth oxide precursor solution, its concentration is 0.01-0.3mol/L.
5. the defeated and dispersed ceramic core of a kind of inorganic easy depoling according to claim 1, is characterized in that, in the preparation of the described coated silica powder of rare earth, the mass ratio of described silica powder, sodium chloride, calcium chloride is 100:1:10-14.
6. a preparation method for the defeated and dispersed ceramic core of inorganic easy depoling as claimed in claim 1, is characterized in that comprising the following steps:
(1) take the coated 10-15% of silica powder body weight of above-mentioned rare earth, 3-5% and the calcium chloride of plasticizer weight mix, at 120-130 ℃, heating is uniformly mixed 10-20 minute, must expect a;
(2) batch mixer is heated to 120-140 ℃, add residue plasticizer, under stirring condition, add successively mineralizer, material a and remain each raw material, after adding, continue to be uniformly mixed 10-12 hour, carry out as requested moulding, sintering obtains the defeated and dispersed ceramic core of described inorganic easy depoling, and described sintering temperature is 1200-1500 ℃, and the time is 0.5-20h.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105499505A (en) * | 2016-02-17 | 2016-04-20 | 屏山县天成精密铸造有限责任公司 | Manufacturing method for precision casting mould |
| CN105693254A (en) * | 2016-02-03 | 2016-06-22 | 中国航空工业集团公司北京航空材料研究院 | Water-soluble ceramic core material and preparation method thereof |
| CN109678535A (en) * | 2019-01-03 | 2019-04-26 | 安徽应流久源核能新材料科技有限公司 | It is a kind of using powder as Water-soluble ceramic core of raw material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2723149B2 (en) * | 1987-03-13 | 1998-03-09 | マツダ株式会社 | Core for pressure casting |
| JPH01148438A (en) * | 1987-12-01 | 1989-06-09 | Mazda Motor Corp | Core for precision casting |
| KR20000006623A (en) * | 1999-07-06 | 2000-02-07 | 이인호 | A method for manufacturing a disintegrative core for a high pressure casting, a core and a method for extracting the core |
| CN102924062B (en) * | 2012-10-25 | 2014-04-16 | 北京航空航天大学 | Preparation method of calcium-oxide-based ceramic core |
| CN103159461A (en) * | 2013-03-15 | 2013-06-19 | 中国航空工业集团公司北京航空材料研究院 | Method for preparing calcium-oxide base ceramic core |
| CN103693976A (en) * | 2013-12-09 | 2014-04-02 | 中国航空工业集团公司北京航空材料研究院 | Method for preparing silicon oxide-based ceramic core for titanium and titanium alloy casting |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105693254A (en) * | 2016-02-03 | 2016-06-22 | 中国航空工业集团公司北京航空材料研究院 | Water-soluble ceramic core material and preparation method thereof |
| CN105693254B (en) * | 2016-02-03 | 2018-03-09 | 中国航空工业集团公司北京航空材料研究院 | A kind of Water-soluble ceramic core material and the method for preparing Water-soluble ceramic core |
| CN105499505A (en) * | 2016-02-17 | 2016-04-20 | 屏山县天成精密铸造有限责任公司 | Manufacturing method for precision casting mould |
| CN109678535A (en) * | 2019-01-03 | 2019-04-26 | 安徽应流久源核能新材料科技有限公司 | It is a kind of using powder as Water-soluble ceramic core of raw material and preparation method thereof |
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Effective date of registration: 20191212 Address after: 313000 Zhejiang province Huzhou city Wuxing district town homes Sheng Street Road No. 158 -1 Patentee after: Zhejiang Zhenxing Axiang Group Co., Ltd. Address before: 241000, No. 37 workshop of small and medium-sized enterprise park, South Zone, hi tech Industrial Development Zone, Yijiang District, Anhui, Wuhu Patentee before: Wuhu Zhexin New Energy Co., Ltd. |
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