CN104129975A - Rare earth coated calcium oxide based ceramic core - Google Patents
Rare earth coated calcium oxide based ceramic core Download PDFInfo
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- CN104129975A CN104129975A CN201410224746.0A CN201410224746A CN104129975A CN 104129975 A CN104129975 A CN 104129975A CN 201410224746 A CN201410224746 A CN 201410224746A CN 104129975 A CN104129975 A CN 104129975A
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Abstract
The invention discloses a rare earth coated calcium oxide based ceramic core, which is characterized by being composed of the following raw materials by weight: 6-12wt% a mineralization agent, 10-17wt% of a plasticizer, 1-1.4wt% of oleic acid, and the balance rare earth coated calcium oxide powder. The product has enough room temperature, high temperature strength, good chemical stability, low firing shrinkage and linear expansion rate, adopts rare earth coated calcium oxide as aggregate and has very good core removal ability, thus reducing the use cost.
Description
Technical field
The present invention relates generally to precision casting field, relates in particular to the coated calcium oxide-based ceramic core of a kind of rare earth.
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 technical 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 calcium oxide, 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 precision casting, in this invention, adopting boron nitride powder and acetic acid zirconium thereof or silicon sol 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 integrity 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, calcium oxide core material also receives related scientific research personnel's concern, as the Chinese invention patent application of CN 102531648 A discloses calcium oxide matrix 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 coated calcium oxide-based ceramic core of a kind of rare earth.
The present invention is achieved by the following technical solutions:
Rare earth is coated a calcium oxide-based ceramic core, it is characterized in that what it was comprised of the raw material of following weight per-cent:
Mineralizer 6-12wt%, softening agent 10-17 wt%, oleic acid 1-1.4 wt %, surplus are the coated calcium oxide powder of rare earth;
Described mineralizer be a kind of in silicon-dioxide, magnesium oxide, aluminum oxide or two kinds and more than, with any mass ratio, mix and form;
Described softening agent is comprised of the raw material of following weight parts:
Paraffin 80-90, propolis 3-4, terpine resin 4-5, polyethylene oxide 1-2, Silane coupling agent KH550 0.1-0.2;
By above-mentioned terpine resin thermoplastic, add polyethylene oxide, after stirring, add each raw material of residue, 600-800 rev/min of dispersed with stirring 4-6 minute, cooling discharging, obtains described softening agent;
The preparation method of the described coated calcium oxide of rare earth comprises the following steps:
(1) calcium oxide and titanium dioxide are mixed, ball milling sub-sieve, obtaining particle diameter is 50-70 μ m, obtains basic powder;
(2) Union carbide A-162 is joined in 150-200 dehydrated alcohol doubly, stirring and dissolving, adds above-mentioned basic powder, and 1000-1700 rev/min of dispersed with stirring 10-20 minute, obtains dispersion liquid;
(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 dispersion liquid is added in precursor solution, the pH value of regulator solution, to 8-10, obtains mixed solution;
(5) above-mentioned mixed solution is dried, obtain drying powder, oven dry powder is carried out to sintering and obtain the coated calcium oxide powder of rare earth, sintering temperature is 1200-1500 ℃, and the time is 0.5-20h.
Rare earth is coated a calcium oxide-based ceramic core, and in the preparation of the described coated calcium oxide of rare earth, the described mixing quality of rare earth oxide presoma and the mass ratio of basic powder are 1:16-20.
Rare earth is coated a calcium oxide-based ceramic core, and in the preparation of the described coated calcium oxide of rare earth, described inorganic zirconates is zirconium chloride or zirconium nitrate, and described inorganic yttrium salts is Yttrium trichloride or Yttrium trinitrate.
Rare earth is coated a calcium oxide-based ceramic core, in the preparation of the described coated calcium oxide of rare earth, and described rare earth oxide precursor solution, its concentration is 0.01-0.5mol/L.
Rare earth is coated a calcium oxide-based ceramic core, and in the preparation of the described coated calcium oxide of rare earth, the mass ratio of described calcium oxide, titanium dioxide, Union carbide A-162 is 100:7-14:1-2.
A preparation method for the coated calcium oxide-based ceramic core of rare earth, comprises the following steps:
Oleic acid is joined in the coated calcium oxide powder of rare earth, at 50-60 ℃, be uniformly mixed 10-15 minute, obtain Preblend, mixer is heated to 120-140 ℃, add above-mentioned softening agent, under agitation condition, add successively Preblend, mineralizer, after adding, continue to be uniformly mixed 10-12 hour, carry out as requested moulding, sintering obtains the coated calcium oxide-based ceramic core of described rare earth, described sintering temperature is 1200-1500 ℃, and the time is 0.5-20h.
Advantage of the present invention is:
These goods have enough room temperatures, hot strength, good chemical stability, and low burning till shunk and linear expansivity, with the coated calcium oxide of rare earth, as aggregate, has again good depoling ability, reduced use cost.
Embodiment
Embodiment 1
Rare earth is coated a calcium oxide-based ceramic core, it is characterized in that what it was comprised of the raw material of following weight per-cent:
Mineralizer 12wt%, softening agent 17 wt%, oleic acid 1.4 wt %, surplus are the coated calcium oxide powder of rare earth;
Described mineralizer is silicon-dioxide;
Described softening agent is comprised of the raw material of following weight parts:
Paraffin 90, propolis 34, terpine resin 4, polyethylene oxide 2, Silane coupling agent KH550 0.1;
By above-mentioned terpine resin thermoplastic, add polyethylene oxide, after stirring, add each raw material of residue, 800 revs/min of dispersed with stirring 4 minutes, cooling discharging, obtains described softening agent;
The preparation method of the described coated calcium oxide of rare earth comprises the following steps:
(1) calcium oxide and titanium dioxide are mixed, ball milling sub-sieve, obtaining particle diameter is 70 μ m, obtains basic powder;
(2) Union carbide A-162 is joined in the dehydrated alcohol of 200 times, stirring and dissolving, adds above-mentioned basic powder, and 1700 revs/min of dispersed with stirring 20 minutes, obtain dispersion liquid;
(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 dispersion liquid is added in precursor solution, the pH value to 10 of regulator solution, obtains mixed solution;
(5) above-mentioned mixed solution is dried, obtain drying powder, oven dry powder is carried out to sintering and obtain the coated calcium oxide powder of rare earth, sintering temperature is 1200 ℃, and the time is 20h.
Rare earth is coated a calcium oxide-based ceramic core, and in the preparation of the described coated calcium oxide of rare earth, the described mixing quality of rare earth oxide presoma and the mass ratio of basic powder are 1:20.
Rare earth is coated a calcium oxide-based ceramic core, and in the preparation of the described coated calcium oxide of rare earth, described inorganic zirconates is zirconium chloride or zirconium nitrate, and described inorganic yttrium salts is Yttrium trichloride or Yttrium trinitrate.
Rare earth is coated a calcium oxide-based ceramic core, in the preparation of the described coated calcium oxide of rare earth, and described rare earth oxide precursor solution, its concentration is 0.5mol/L.
Rare earth is coated a calcium oxide-based ceramic core, and in the preparation of the described coated calcium oxide of rare earth, the mass ratio of described calcium oxide, titanium dioxide, Union carbide A-162 is 100:14:1.
A preparation method for the coated calcium oxide-based ceramic core of rare earth, comprises the following steps:
Oleic acid is joined in the coated calcium oxide powder of rare earth, at 60 ℃, be uniformly mixed 15 minutes, obtain Preblend, mixer is heated to 140 ℃, add above-mentioned softening agent, under agitation condition, add successively Preblend, mineralizer, after adding, continue to be uniformly mixed 12 hours, carry out as requested moulding, sintering obtains the coated calcium oxide-based ceramic core of described rare earth, described sintering temperature is 1500 ℃, and the time is 8h.
Performance test:
Ceramic core of the present invention weight rate of body weight gain after the aquation experiment of 20 days is only 0.09%, has good water resistant effect, can meet the demand of titanium alloy precision casting;
Room temperature bending strength is that 34MPa, high-temperature bending strength are 10MPa;
Percent of firing shrinkage is 0.45%.
Claims (6)
1. the coated calcium oxide-based ceramic core of rare earth, is characterized in that what it was comprised of the raw material of following weight per-cent:
Mineralizer 6-12wt%, softening agent 10-17 wt%, oleic acid 1-1.4 wt %, surplus are the coated calcium oxide powder of rare earth;
Described mineralizer be a kind of in silicon-dioxide, magnesium oxide, aluminum oxide or two kinds and more than, with any mass ratio, mix and form;
Described softening agent is comprised of the raw material of following weight parts:
Paraffin 80-90, propolis 3-4, terpine resin 4-5, polyethylene oxide 1-2, Silane coupling agent KH550 0.1-0.2;
By above-mentioned terpine resin thermoplastic, add polyethylene oxide, after stirring, add each raw material of residue, 600-800 rev/min of dispersed with stirring 4-6 minute, cooling discharging, obtains described softening agent;
The preparation method of the described coated calcium oxide powder of rare earth comprises the following steps:
(1) calcium oxide and titanium dioxide are mixed, ball milling sub-sieve, obtaining particle diameter is 50-70 μ m, obtains basic powder;
(2) Union carbide A-162 is joined in 150-200 dehydrated alcohol doubly, stirring and dissolving, adds above-mentioned basic powder, and 1000-1700 rev/min of dispersed with stirring 10-20 minute, obtains dispersion liquid;
(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 dispersion liquid is added in precursor solution, the pH value of regulator solution, to 8-10, obtains mixed solution;
(5) above-mentioned mixed solution is dried, obtain drying powder, oven dry powder is carried out to sintering and obtain the coated calcium oxide powder of rare earth, sintering temperature is 1200-1500 ℃, and the time is 0.5-20h.
2. the coated calcium oxide-based ceramic core of a kind of rare earth according to claim 1, is characterized in that, in the preparation of the described coated calcium oxide of rare earth, the described mixing quality of rare earth oxide presoma and the mass ratio of basic powder are 1:16-20.
3. the coated calcium oxide-based ceramic core of a kind of rare earth according to claim 1, is characterized in that, in the preparation of the described coated calcium oxide powder of rare earth, described inorganic zirconates is zirconium chloride or zirconium nitrate, and described inorganic yttrium salts is Yttrium trichloride or Yttrium trinitrate.
4. the coated calcium oxide-based ceramic core of a kind of rare earth according to claim 1, is characterized in that, in the preparation of the described coated calcium oxide powder of rare earth, and described rare earth oxide precursor solution, its concentration is 0.01-0.5mol/L.
5. the coated calcium oxide-based ceramic core of a kind of rare earth according to claim 1, is characterized in that, in the preparation of the described coated calcium oxide powder of rare earth, the mass ratio of described calcium oxide, titanium dioxide, Union carbide A-162 is 100:7-14:1-2.
6. rare earth as claimed in claim 1 is coated a preparation method for calcium oxide-based ceramic core, it is characterized in that comprising the following steps:
Oleic acid is joined in the coated calcium oxide powder of rare earth, at 50-60 ℃, be uniformly mixed 10-15 minute, obtain Preblend, mixer is heated to 120-140 ℃, add above-mentioned softening agent, under agitation condition, add successively Preblend, mineralizer, after adding, continue to be uniformly mixed 10-12 hour, carry out as requested moulding, sintering obtains the coated calcium oxide-based ceramic core of described rare earth, 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 |
|---|---|---|---|---|
| CN106977133A (en) * | 2017-03-02 | 2017-07-25 | 佛山市锋东复合材料有限公司 | A kind of ceramic core and its preparation method and application |
| CN111992674A (en) * | 2020-07-30 | 2020-11-27 | 东营诚扬精密机械有限公司 | Preparation process of high-strength, high-toughness and easy-removal composite ceramic core for light alloy casting |
| CN112264575A (en) * | 2020-10-20 | 2021-01-26 | 西安工程大学 | Hollow ceramic core adopting die swinging method and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102531648A (en) * | 2011-12-26 | 2012-07-04 | 北京航空航天大学 | Calcium oxide-based ceramic core for casting titanium alloy and manufacturing method thereof |
| CN102924062A (en) * | 2012-10-25 | 2013-02-13 | 北京航空航天大学 | Preparation method of calcium-oxide-based ceramic core |
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2014
- 2014-05-24 CN CN201410224746.0A patent/CN104129975B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102531648A (en) * | 2011-12-26 | 2012-07-04 | 北京航空航天大学 | Calcium oxide-based ceramic core for casting titanium alloy and manufacturing method thereof |
| CN102924062A (en) * | 2012-10-25 | 2013-02-13 | 北京航空航天大学 | Preparation method of calcium-oxide-based ceramic core |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106977133A (en) * | 2017-03-02 | 2017-07-25 | 佛山市锋东复合材料有限公司 | A kind of ceramic core and its preparation method and application |
| CN106977133B (en) * | 2017-03-02 | 2021-04-23 | 佛山市恒之芯复合材料有限公司 | Ceramic core and preparation method and application thereof |
| CN111992674A (en) * | 2020-07-30 | 2020-11-27 | 东营诚扬精密机械有限公司 | Preparation process of high-strength, high-toughness and easy-removal composite ceramic core for light alloy casting |
| CN112264575A (en) * | 2020-10-20 | 2021-01-26 | 西安工程大学 | Hollow ceramic core adopting die swinging method and preparation method thereof |
| CN112264575B (en) * | 2020-10-20 | 2021-11-19 | 西安工程大学 | Hollow ceramic core adopting die swinging method and preparation method thereof |
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