CN101311294B - Method for preparing aluminium borate whisker preform - Google Patents
Method for preparing aluminium borate whisker preform Download PDFInfo
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- CN101311294B CN101311294B CN2008100179923A CN200810017992A CN101311294B CN 101311294 B CN101311294 B CN 101311294B CN 2008100179923 A CN2008100179923 A CN 2008100179923A CN 200810017992 A CN200810017992 A CN 200810017992A CN 101311294 B CN101311294 B CN 101311294B
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- whisker
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- preform
- aluminium borate
- borate whisker
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Abstract
The invention discloses a preparation method for an aluminum borate whisker preform which is characterized by comprising the following steps: according to the proportion, aluminum borate whisker, aluminum phosphate, water and sodium polyacrylate are placed in an agitator, the rotating speed of which is adjusted to be 180 to 220 revolutions per second; the mixture is stirred and dispersed for a plurality of times in a time-shared way, and then mixed slurry is obtained; 80 percent of water in the mixed slurry is filtered and the rest is placed in a concave mould for pressure maintaining for five to eight minutes; the mould is taken off to gain a bisque of the preform; the dried bisque of the preform is sintered at the temperature of 800 to 900 DEG C in a muffle furnace for two to three hours; the bisque is cooled with the furnace and the whisker preform is obtained. In the method, the sodium polyacrylate with concentration of 0.3 to 0.5 percent is taken as dispersant, the aluminum borate whisker is stirred and dispersed for a plurality of times in the time-shared way, and meanwhile the aluminum phosphate is added as adhesives, so that the whisker is guaranteed to be fully soaked and then dispersed, and meantime, the adhesives is totally fused into the slurry. Compared with the present ultrasonic dispersion technique, the method shortens the original dispersion time of one to two hours to 3.5 to 5.5 minutes, thus reducing the cost.
Description
Technical field
The present invention relates to a kind of preparation method of aluminium borate whisker preform.
Background technology
The main at present technology of preparing that adopts of whisker reinforced metal matrix composites has extrusion casting and pressure infiltration etc., all needs earlier whisker to be made precast body, under pressure molten metal liquid is infiltrated up in the precast body again.This just requires the existing certain porosity of whisker preform, guarantees that metal liquid can be infiltrated up in the precast body fully, has enough ultimate compression strength again, to bear metal liquid infiltration time institute's plus-pressure.In addition, whether being uniformly dispersed of whisker in the precast body directly affects the mechanical property of matrix material.Therefore, make the metal-base composites of excellent performance, whisker preform must satisfy three conditions, and whisker is uniformly dispersed, porosity, ultimate compression strength.But, because the whisker specific surface energy is big, mat under the state usually, adopt mechanical process to disperse after, again can be rapidly mat again.
Document 1 " number of patent application is 93117478.3 Chinese patents " discloses a kind of making method that is used for the prefabricated section of metal-base composites.Disperse whisker by water logging and ultra-sonic oscillation, and add an amount of water-soluble organic gel, to guarantee prefabricated section intensity as caking agent.Drying, sintering after mold pressing obtain precast body again.
Document 2 " number of patent application is 200410043979.7 Chinese patents " discloses the method that a kind of preparation mixes whisker and nano particle precast body.With the Sodium dodecylbenzene sulfonate of 2% mass concentration or sodium polyacrylate anion surfactant as dispersion agent, after whisker and water mix, carried out ultrasonic dispersing 30～60 minutes, under the ultrasonic wave effect, carry out 30～60 minutes mechanical stirring then again, drying, sintering obtain precast body after filtration, the mold pressing.
All there is length consuming time in aforesaid method, the shortcoming that energy consumption is high.The method ultrasonic dispersing of document 1 needs 8～12 hours, though the method ultrasonic dispersing of document 2 is consuming time less, ultrasonic dispersing and stirring still need 1～2 hour.And two kinds of methods all need to disperse by ultra-sonic oscillation, need to be equipped with ultrasonic equipment, have increased preparation cost.
Summary of the invention
The technical problem to be solved in the present invention is the long deficiency of ultrasonic dispersing time that overcomes the prior art whisker, and a kind of preparation method of aluminium borate whisker preform is provided, and by adding dispersion agent, cooperative mechanical stirs prepares whisker preform at short notice.
The technical solution adopted for the present invention to solve the technical problems: a kind of preparation method of aluminium borate whisker preform is characterized in that comprising the steps:
(a) according to the volume fraction formula:
Calculate the quality m of required aluminium borate whisker, then according to aluminium borate whisker: aluminum phosphate: water: sodium polyacrylate=500: 25: 5000: after 3 the ratio difference weighing, put into agitator in the lump, it is 3～5 ‰ solution that sodium polyacrylate need be mixed with mass concentration earlier, and above ratio is mass ratio;
(b) rotating speed of agitator is transferred to 180～220 revolutions per seconds and was stirred 30 seconds, paused 60～120 seconds, stirred once more 30 seconds, paused again 60～120 seconds, stirred once more 30 seconds, obtain mixed slurry;
(c) 80% moisture in the filtration removal mixed slurry;
(d) mixed slurry after will filtering is put into die, and volume fraction and size Selection compacting height according to whisker preform are forced into desired height, and pressurize is after 5～8 minutes, and the demoulding obtains the precast body biscuit;
(e) the precast body biscuit dried by the fire 6～8 hours in 100～120 ℃ in baking oven;
(f) the precast body biscuit after the oven dry in 800～900 ℃ of sintering 2～3 hours, takes out behind the furnace cooling in retort furnace, obtains whisker preform.
The invention has the beneficial effects as follows: adopt the sodium polyacrylate solution of 3～5 ‰ concentration whisker to be carried out repeatedly timesharing dispersed with stirring as the whisker dispersion agent, stir and to add binding agent simultaneously, guaranteed that whisker is soaked into fully and makes caking agent to be fused in the slurry fully when spreading out under the effect of dispersion agent and moisture.Compare with existing ultrasonic dispersing technology, jitter time shortened to 3.5～5.5 minutes by 1～2 hour, had reduced preparation cost.
Below in conjunction with embodiment the present invention is elaborated.
Embodiment
Embodiment 1: the preparation volume is
The aluminium borate whisker volume fraction is 30% aluminium borate whisker cylinder precast body.
(1) according to the volume fraction formula:
Calculate the quality m of required aluminium borate whisker, vol% is the whisker volume fraction in the formula, and v is the whisker volume, and ρ is a whisker density.Take by weighing aluminium borate whisker 44.7g, take by weighing aluminum phosphate 2.3g, put into agitator respectively, add the sodium polyacrylate of 448ml water and 90ml mass concentration 3 ‰ as dispersion agent at agitator as caking agent.
(2) transfer the road to stir 30 seconds for 180 revolutions per seconds the rotating speed of agitator, paused 60 seconds, stirred once more 30 seconds, paused again 60 seconds, stirred once more 30 seconds, obtain mixed slurry.
(3) 80% moisture in the filtration removal mixed slurry.
(4) mixed slurry after will filtering is put into die, is depressed into preset height 32mm, and pressurize is after 5 minutes, and the demoulding obtains the precast body biscuit.
(5) the precast body biscuit dried by the fire 6 hours in 120 ℃ in baking oven.
(6) the precast body biscuit after the oven dry in 800 ℃ of sintering 3 hours, takes out behind the furnace cooling in retort furnace, obtains whisker preform.
Embodiment 2: the preparation volume is
The aluminium borate whisker volume fraction is 25% aluminium borate whisker cylinder precast body.
(1) according to the volume fraction formula:
Calculate the quality m of required aluminium borate whisker, vol% is the whisker volume fraction in the formula, and v is the whisker volume, and ρ is a whisker density.Take by weighing aluminium borate whisker 37.3g, take by weighing aluminum phosphate 1.9g, put into agitator respectively, add the sodium polyacrylate of 373ml water and 75ml mass concentration 4 ‰ as dispersion agent at agitator as caking agent.
(2) transfer the road to stir 30 seconds for 200 revolutions per seconds the rotating speed of agitator, paused 90 seconds, stirred once more 30 seconds, paused again 90 seconds, stirred once more 30 seconds, obtain mixed slurry.
(3) 80% moisture in the filtration removal mixed slurry.
(4) mixed slurry after will filtering is put into die, is depressed into preset height 32mm, and pressurize is after 6 minutes, and the demoulding obtains the precast body biscuit.
(5) the precast body biscuit dried by the fire 7 hours in 110 ℃ in baking oven.
(6) the precast body biscuit after the oven dry in 850 ℃ of sintering 2.5 hours, takes out behind the furnace cooling in retort furnace, obtains whisker preform.
Embodiment 3: the preparation volume is
The aluminium borate whisker volume fraction is 20% aluminium borate whisker cylinder precast body.
(1) according to the volume fraction formula:
Calculate the quality m of required aluminium borate whisker, vol% is the whisker volume fraction in the formula, and v is the whisker volume, and ρ is a whisker density.Take by weighing aluminium borate whisker 29.8g, take by weighing aluminum phosphate 1.5g, put into agitator respectively, add the sodium polyacrylate of 298ml water and 60ml mass concentration 5 ‰ as dispersion agent at agitator as caking agent.
(2) transfer the road to stir 30 seconds for 210 revolutions per seconds the rotating speed of agitator, paused 120 seconds, stirred once more 30 seconds, paused again 120 seconds, stirred once more 30 seconds, obtain mixed slurry.
(3) 80% moisture in the filtration removal mixed slurry.
(4) mixed slurry after will filtering is put into die, is depressed into preset height 32mm, and pressurize is after 7 minutes, and the demoulding obtains the precast body biscuit.
(5) the precast body biscuit dried by the fire 8 hours in 100 ℃ in baking oven.
(6) the precast body biscuit after the oven dry in 900 ℃ of sintering 2 hours, takes out behind the furnace cooling in retort furnace, obtains whisker preform.
Embodiment 4: the preparation volume is
The aluminium borate whisker volume fraction is 15% aluminium borate whisker cylinder precast body.
(1) according to the volume fraction formula:
Calculate the quality m of required aluminium borate whisker, vol% is the whisker volume fraction in the formula, and v is the whisker volume, and ρ is a whisker density.Take by weighing aluminium borate whisker 22.4g, take by weighing aluminum phosphate 1.1g, put into agitator respectively, add the sodium polyacrylate of 225ml water and 45ml mass concentration 3 ‰ as dispersion agent at agitator as caking agent.
(2) transfer the road to stir 30 seconds for 180 revolutions per seconds the rotating speed of agitator, paused 60 seconds, stirred once more 30 seconds, paused again 60 seconds, stirred once more 30 seconds, obtain mixed slurry.
(3) 80% moisture in the filtration removal mixed slurry.
(4) mixed slurry after will filtering is put into die, is depressed into preset height 32mm, and pressurize is after 8 minutes, and the demoulding obtains the precast body biscuit.
(5) the precast body biscuit dried by the fire 7 hours in 105 ℃ in baking oven.
(6) the precast body biscuit after the oven dry in 850 ℃ of sintering 2 hours, takes out behind the furnace cooling in retort furnace, obtains whisker preform.
Claims (1)
1. the preparation method of an aluminium borate whisker preform is characterized in that comprising the steps:
(a) according to the volume fraction formula:
Calculate the quality m of required aluminium borate whisker, vol% is the whisker volume fraction in the formula, and v is the whisker volume, and ρ is a whisker density; Then according to aluminium borate whisker: aluminum phosphate: water: sodium polyacrylate=500: 25: 5000: 3 ratio after the weighing, is put into agitator respectively in the lump, and it is 3～5 ‰ solution that sodium polyacrylate need be mixed with mass concentration earlier; Above ratio is mass ratio;
(b) rotating speed of agitator is transferred to 180～220 revolutions per seconds and was stirred 30 seconds, paused 60～120 seconds, stirred once more 30 seconds, paused again 60～120 seconds, stirred once more 30 seconds, obtain mixed slurry;
(c) 80% moisture in the filtration removal mixed slurry;
(d) mixed slurry after will filtering is put into die, and volume fraction and size Selection compacting height according to whisker preform are forced into desired height, and pressurize is after 5～8 minutes, and the demoulding obtains the precast body biscuit;
(e) the precast body biscuit dried by the fire 6～8 hours in 100～120 ℃ in baking oven;
(f) the precast body biscuit after the oven dry in 800～900 ℃ of sintering 2～3 hours, takes out behind the furnace cooling in retort furnace, obtains whisker preform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100179923A CN101311294B (en) | 2008-04-17 | 2008-04-17 | Method for preparing aluminium borate whisker preform |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100179923A CN101311294B (en) | 2008-04-17 | 2008-04-17 | Method for preparing aluminium borate whisker preform |
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| CN101311294A CN101311294A (en) | 2008-11-26 |
| CN101311294B true CN101311294B (en) | 2010-06-09 |
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| CN2008100179923A Expired - Fee Related CN101311294B (en) | 2008-04-17 | 2008-04-17 | Method for preparing aluminium borate whisker preform |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106119949B (en) * | 2016-06-23 | 2018-08-17 | 南通奥新电子科技有限公司 | A kind of preparation method and its magnetic modification application of high intensity potassium titanate crystal whisker |
| CN106119950B (en) * | 2016-06-23 | 2018-08-17 | 南通奥新电子科技有限公司 | A kind of preparation method and applications of high intensity potassium titanate crystal whisker |
| CN106702487B (en) * | 2016-12-19 | 2018-01-30 | 滨州渤海活塞有限公司 | A kind of ferrophosphorus aluminium borate whisker preform manufacture method |
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