CN103031476A - Rare-earth ceramic alloy and preparation method thereof - Google Patents
Rare-earth ceramic alloy and preparation method thereof Download PDFInfo
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- CN103031476A CN103031476A CN2012105398020A CN201210539802A CN103031476A CN 103031476 A CN103031476 A CN 103031476A CN 2012105398020 A CN2012105398020 A CN 2012105398020A CN 201210539802 A CN201210539802 A CN 201210539802A CN 103031476 A CN103031476 A CN 103031476A
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Abstract
The invention discloses a rare-earth ceramic alloy and a preparation method thereof. The rare-earth ceramic alloy is formed by the following components in parts by weight: 2-6 parts of silicon oxide, 3-5 parts of aluminum oxide, 0.6-2.2 parts of lanthanum oxide, 0.4-2 parts of yttrium oxide and 60-80 parts of molybdenum.
Description
Technical field
The present invention relates to the rare-earth ceramic Alloy And Preparation Method.
Background technology
The characteristic such as the metal Mo and Mo alloys has the fusing point height, hot strength is large, high temperature creep rate is low, the coefficient of expansion is little, heat-conductivity conducting and thermal shock resistance are excellent, resistance to wear and corrosion resistance is strong is widely used in the numerous areas such as metallurgy, machinery, oil, chemical industry, national defence, Aeronautics and Astronautics, electronics, nuclear industry as high performance material.Yet metal molybdenum at high temperature intensity, toughness, hardness is relatively poor, and recrystallization temperature is low, easily brittle failure behind the recrystallize.Simultaneously, the Mo and Mo alloys low temperature brittleness is large, and it is high to mould a crisp transition temperature.These disadvantages affect the processing characteristics of Mo and Mo alloys, thereby limit its range of application.
At present, rare earth molybdenum alloy has very high recrystallization temperature and good mechanics bamboo energy, be widely used under the worst hot case condition, but its inside does not contain the wear-resisting phase of high rigidity, because wear resistance is poor.Wear-resisting phase is contained in TZM alloy inside, and high temperature abrasion resistance is better than the TZM alloy, so the wear-resistant field of high temperature uses molybdenum alloy and be mainly the TZM alloy, but since the wear-resistant phasor of hard in the TZM alloy seldom, so its wear resistance is limited.Therefore, have simultaneously high recrystallization temperature, good mechanical property and wear resistance molybdenum alloy has broad application prospects in the wear-resistant field of high temperature.
Summary of the invention
For the shortcoming of prior art, the invention provides a kind of rare-earth ceramic Alloy And Preparation Method.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of rare-earth ceramic alloy, its component by following body weight content forms: 2～6 parts of silicon oxide, 3～5 parts in aluminum oxide, 0.6～2.2 part of lanthanum trioxide, 0.4～2 part of yttrium oxide, 60～80 parts of molybdenums.
A kind of preparation method of rare-earth ceramic alloy, its step is as follows:
S1: take by weighing ammonium molybdate, the oxygen acid soluble salt of lanthanum, yttrium and the oxygen acid soluble salt of aluminium are mixed with respectively solution;
S2: add citric acid in the ammonium molybdate solution and mix, then add silicon, aluminum salt solution and lanthanum, the yttrium salts solution for preparing, be incubated 6～8 hours at 80～85 ℃ and obtain wet gel;
S3: wet gel was obtained xerogel in 6～10 hours 120～140 ℃ of oven dry, then obtain mixed powder 540～580 ℃ of roastings;
S4: mixed powder was reduced 6～11 hours under 520～980 ℃ of hydrogen atmospheres;
S5: the mixed powder of reduction is made blank under 400～600MPa pressure, with blank sintering 15～18 hours under 1700～1900 ℃ of hydrogen atmospheres, make molybdenum alloy.
The mass ratio of step S2 ammonium molybdate and citric acid is 1:1.35～4.
The mass concentration of the aluminum nitrate solution of step S1 preparation is 30～35%.
The mass concentration of the lanthanum nitrate hexahydrate of step mule S1 preparation is 20～25%.
The mass concentration of the yttrium nitrate solution of step mule S1 preparation is 18～22%.
The described hydrogen atmosphere of step S4 was reduced at first under 520～560 ℃ of hydrogen atmospheres reduction reaction 3～5 hours, then reduction reaction 2～4 hours under 950～980 ℃ of hydrogen atmospheres.
Compared with prior art, the present invention adds the chemical reaction that people's rare earth oxide can promote the component such as aluminum oxide and silicon oxide in the material, be easy to form the low melting point liquid phase, and by the capillary action between the particle, the material that impels particle to ask is filled to the hole place, and the reduction of material porosity, density are improved.
Embodiment
The present invention is further illustrated below in conjunction with specific embodiment.
EXAMPLE l
A kind of rare-earth ceramic alloy, its component by following body weight content forms: 2 parts of silicon oxide, 3 parts in aluminum oxide, 0.8 part of lanthanum trioxide, 0.6 part of yttrium oxide, 65 parts of molybdenums.
Present embodiment provides a kind of preparation method of rare-earth ceramic alloy, and its step is as follows:
S1: take by weighing ammonium molybdate, the oxygen acid soluble salt of lanthanum, yttrium and the oxygen acid soluble salt of aluminium are mixed with respectively solution;
S2: add citric acid in the ammonium molybdate solution and mix, then add silicon, aluminum salt solution and lanthanum, the yttrium salts solution for preparing, be incubated 7 hours at 80 ℃ and obtain wet gel;
S3: wet gel was obtained xerogel in 8 hours 120 ℃ of oven dry, then obtain mixed powder 540 ℃ of roastings;
S4: mixed powder was reduced 8 hours under 540 ℃ of hydrogen atmospheres;
S5: the mixed powder of reduction is made blank under 400MPa pressure, with blank sintering 15 hours under 1900 ℃ of hydrogen atmospheres, make molybdenum alloy.
The mass ratio of step S2 ammonium molybdate and citric acid is 1:2.
The mass concentration of the aluminum nitrate solution of step S1 preparation is 31%.
The mass concentration of the lanthanum nitrate hexahydrate of step mule S1 preparation is 22%.
The mass concentration of the yttrium nitrate solution of step mule S1 preparation is 19%.
The described hydrogen atmosphere of step S4 was reduced at first under 520 ℃ of hydrogen atmospheres reduction reaction 4.5 hours, then reduction reaction 3.5 hours under 950 ℃ of hydrogen atmospheres.
Embodiment 2
A kind of rare-earth ceramic alloy, its component by following body weight content forms: 6 parts of silicon oxide, 5 parts in aluminum oxide, 2 parts of lanthanum trioxides, 1.8 parts of yttrium oxide, 78 parts of molybdenums.
Present embodiment provides a kind of preparation method of rare-earth ceramic alloy, and its step is as follows:
S1: take by weighing ammonium molybdate, the oxygen acid soluble salt of lanthanum, yttrium and the oxygen acid soluble salt of aluminium are mixed with respectively solution;
S2: add citric acid in the ammonium molybdate solution and mix, then add silicon, aluminum salt solution and lanthanum, the yttrium salts solution for preparing, be incubated 6 hours at 85 ℃ and obtain wet gel;
S3: wet gel was obtained xerogel in 7 hours 140 ℃ of oven dry, then obtain mixed powder 580 ℃ of roastings;
S4: mixed powder was reduced 7 hours under 900 ℃ of hydrogen atmospheres;
S5: the mixed powder of reduction is made blank under 580MPa pressure, with blank sintering 15～18 hours under 1750 ℃ of hydrogen atmospheres, make molybdenum alloy.
The mass ratio of step S2 ammonium molybdate and citric acid is 1:3.5.
The mass concentration of the aluminum nitrate solution of step S1 preparation is 35%.
The mass concentration of the lanthanum nitrate hexahydrate of step mule S1 preparation is 25%.
The mass concentration of the yttrium nitrate solution of step mule S1 preparation is 22%.
The described hydrogen atmosphere of step S4 was reduced at first under 560 ℃ of hydrogen atmospheres reduction reaction 3.2 hours, then reduction reaction 2 hours under 980 ℃ of hydrogen atmospheres.
Claims (7)
1. a rare-earth ceramic alloy is characterized in that, is comprised of the component of following body weight content: 2～6 parts of silicon oxide, 3～5 parts in aluminum oxide, 0.6～2.2 part of lanthanum trioxide, 0.4～2 part of yttrium oxide, 60～80 parts of molybdenums.
2. preparation method of described rare-earth ceramic alloy according to claim 1 is characterized in that its step is as follows:
S1: take by weighing ammonium molybdate, the oxygen acid soluble salt of lanthanum, yttrium and the oxygen acid soluble salt of aluminium are mixed with respectively solution;
S2: add citric acid in the ammonium molybdate solution and mix, then add silicon, aluminum salt solution and lanthanum, the yttrium salts solution for preparing, be incubated 6～8 hours at 80～85 ℃ and obtain wet gel;
S3: wet gel was obtained xerogel in 6～10 hours 120～140 ℃ of oven dry, then obtain mixed powder 540～580 ℃ of roastings;
S4: mixed powder was reduced 6～11 hours under 520～980 ℃ of hydrogen atmospheres;
S5: the mixed powder of reduction is made blank under 400～600MPa pressure, with blank sintering 15～18 hours under 1700～1900 ℃ of hydrogen atmospheres, make molybdenum alloy.
3. the preparation method of described rare-earth ceramic alloy according to claim 2, it is characterized in that: the mass ratio of step S2 ammonium molybdate and citric acid is 1:1.35～4.
4. the preparation method of described rare-earth ceramic alloy according to claim 2, it is characterized in that: the mass concentration of the aluminum nitrate solution of step S1 preparation is 30～35%.
5. the preparation method of described rare-earth ceramic alloy according to claim 2, it is characterized in that: the mass concentration of the lanthanum nitrate hexahydrate of step mule S1 preparation is 20～25%.
6. the preparation method of described rare-earth ceramic alloy according to claim 2, it is characterized in that: the mass concentration of the yttrium nitrate solution of step mule S1 preparation is 18～22%.
7. the preparation method of described rare-earth ceramic alloy according to claim 2, it is characterized in that: the described hydrogen atmosphere of step S4 was reduced at first under 520～560 ℃ of hydrogen atmospheres reduction reaction 3～5 hours, then reduction reaction 2～4 hours under 950～980 ℃ of hydrogen atmospheres.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104911428A (en) * | 2015-04-13 | 2015-09-16 | 北京工业大学 | Wear resistant molybdenum alloy plug and preparation method thereof |
| CN106270529A (en) * | 2016-08-11 | 2017-01-04 | 合肥毅创钣金科技有限公司 | A kind of high temperature resistant shock resistance ceramic-seal ring and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60138058A (en) * | 1983-12-27 | 1985-07-22 | Toshiba Corp | Manufacture of molybdenum material |
| US6090227A (en) * | 1997-05-09 | 2000-07-18 | Schwarzkopf Technologies Corp. | Structural units for glass melts made from a molybdenum/tungsten alloy |
| JP2001115228A (en) * | 1999-10-20 | 2001-04-24 | Nippon Tungsten Co Ltd | Tungsten-molybdenum alloy |
| CN102690984A (en) * | 2012-01-12 | 2012-09-26 | 河南科技大学 | Rare earth ceramic reinforced molybdenum alloy and preparation method thereof |
-
2012
- 2012-12-14 CN CN2012105398020A patent/CN103031476A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60138058A (en) * | 1983-12-27 | 1985-07-22 | Toshiba Corp | Manufacture of molybdenum material |
| US6090227A (en) * | 1997-05-09 | 2000-07-18 | Schwarzkopf Technologies Corp. | Structural units for glass melts made from a molybdenum/tungsten alloy |
| JP2001115228A (en) * | 1999-10-20 | 2001-04-24 | Nippon Tungsten Co Ltd | Tungsten-molybdenum alloy |
| CN102690984A (en) * | 2012-01-12 | 2012-09-26 | 河南科技大学 | Rare earth ceramic reinforced molybdenum alloy and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104911428A (en) * | 2015-04-13 | 2015-09-16 | 北京工业大学 | Wear resistant molybdenum alloy plug and preparation method thereof |
| CN104911428B (en) * | 2015-04-13 | 2017-04-05 | 北京工业大学 | A kind of wear-resistant molybdenum alloy top and preparation method thereof |
| CN106270529A (en) * | 2016-08-11 | 2017-01-04 | 合肥毅创钣金科技有限公司 | A kind of high temperature resistant shock resistance ceramic-seal ring and preparation method thereof |
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Application publication date: 20130410 |