CN103183501B - Micro-nano spherical SG corundum abrasive and preparation method thereof - Google Patents
Micro-nano spherical SG corundum abrasive and preparation method thereof Download PDFInfo
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- CN103183501B CN103183501B CN201310079898.1A CN201310079898A CN103183501B CN 103183501 B CN103183501 B CN 103183501B CN 201310079898 A CN201310079898 A CN 201310079898A CN 103183501 B CN103183501 B CN 103183501B
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Abstract
The invention relates to a micro-nano spherical SG corundum abrasive and a preparation method thereof. The technical main point is that industrial grade pseudo-boehmite and deionized water are made into uniformly distributed suspension at a certain mass ratio under the action of mechanical stirring; a certain amount of nitric acid solution is added into the suspension dropwise under a certain temperature condition and continuous stirring; and the pseudo-boehmite sol is obtained. The micro-nano spherical SG corundum abrasive prepared by the preparation method is good in toughness, self-sharpening and abrasive resistance, and is less prone to scratch workpiece surfaces when used as an abrasive for high-precision grinding or polishing, so that machining precision and surface quality of machined workpieces are increased, and the effect of precise grinding and polishing is achieved.
Description
Technical field
The present invention relates to grinding technique field in material engineering, be related specifically to high-accuracy grinding Micro-nano spherical SG corundum abrasive and preparation method thereof.
Background technology
Since 19th century, aloxite was succeeded in developing, achieve the development that is exceedingly fast and applied widely, having become the indispensable Industrial products of a class.Because corundum abrasive has good mechanical property and high-temperature stability, it is made to play irreplaceable effect in fields such as automobile, Aeronautics and Astronautics, machinofacture.Tradition corundum abrasive product adopts electric energy to add aluminum oxide in thermic arc mostly, makes temperature reach more than the fusing point of aluminum oxide, then through techniques such as overcooling, fragmentation, classifications, finally obtained corundum abrasive.The abrasive material prepared in this way, the crystal contained in each abrasive particle is less, and coarse grains, easily produces tiny crack, and during grinding, abrasive particle easily comes off from grinding tool.Simultaneously due to the irregularity of some abrasive particle shape, the abrasive material that the method is produced mainly is applicable to the higher grinding of working (machining) efficiency, adds the surface that man-hour easily scratches processing work, be difficult to the processing reaching high surface finish for polishing etc.
Along with the development of modern science and technology, to mechanical component working accuracy, the requirement of surfaceness and integrity is more and more higher, therefore also more and more higher to the requirement of the abrasive material being suitable for accurate grinding or polishing purposes.At present, the domestic abrasive material for high-accuracy grinding or polishing mainly still depends on import, and expensive.
Summary of the invention
The present invention is a kind of Micro-nano spherical SG corundum abrasive for high-accuracy grinding or polishing and preparation method thereof.Toughness, the self-sharpening of the Micro-nano spherical SG corundum abrasive prepared with this invention are good, and when can reduce grinding or polishing, abrasive material is to the scuffing degree on processing work surface simultaneously, effectively can improve the surface quality of working accuracy and workpiece.
The technology of the present invention solution is as follows:
A preparation method for Micro-nano spherical SG corundum abrasive, comprises the following steps successively:
1) preparation of sol solutions: take pseudo-boehmite as raw material, nitric acid is that pseudo-boehmite sol solutions prepared by peptizing agent;
2) granulation: adopt the mode of mist projection granulating to sol solutions mist projection granulating;
3) calcine: by the particle calcining after granulation, can Micro-nano spherical SG corundum abrasive be obtained.
During the preparation of the sol solutions described in step 1), first technical grade pseudo-boehmite (its purity is not less than 80%) and deionized water are mixed according to the ratio of mass ratio 10 ~ 40:90 ~ 60, make finely dispersed suspension.
During the preparation of the sol solutions described in step 1), in the process constantly stirred, in suspension, add the HNO that mass concentration is 4% ~ 11%
3solution; Until form even, milky colloidal sol.
During the preparation of the sol solutions described in step 1), add HNO
3shi Wendu is 40-60 DEG C.
Step 2) described in mist projection granulating time spray pressure be 0.2-0.6MPa, drying temperature is 180-220 DEG C, and the size of granulation is 4 ~ 10 μm.
Calcining process described in step 3) is: with the speed of 3-4 DEG C/min, rise to 1100-1300 DEG C from room temperature, arrives after stablizing and is incubated 80-100min, finally naturally cool to room temperature.
The calcining that heats up is front by the dry 1-3h at 80-100 DEG C of the particle after spraying dry.
A kind of Micro-nano spherical SG corundum abrasive is prepared from by above-mentioned method.
Advantage of the present invention
The preparation method of Micro-nano spherical SG corundum abrasive of the present invention is compared with the preparation method of traditional corundum abrasive product, and reaction process is easy to control.And take sol solutions as the good uniformity of presoma, system, make the product homogeneous microstructure of gained, purity is high.Adopt mist projection granulating, make the abrasive grain that obtains tiny, and adjustable, and specific surface area is large, and surface energy is high, has high activity, so temperature is low in calcination process.The abrasive material prepared by this method all can be converted into a-Al at 1100-1200 DEG C
2o
3(Fig. 1).Further, adopt mist projection granulating and certain calcining process can prepare the abrasive material (Fig. 2) of spherical nanometer-diameter, not easily scratch workpiece surface when this abrasive material is used for high-accuracy grinding or polishing, thus improve the surface quality of working accuracy and processing work.
Accompanying drawing explanation
Fig. 1 is 1100 DEG C and 1200 DEG C of rear sample XRD figure spectrums of sintering;
Fig. 2 is micro-nano spherical SG abrasive surface pattern electronic scanning figure;
Fig. 3 is the preparation technology figure of micro-nano spherical SG abrasive material;
Fig. 4 is micro-nano spherical SG abrasive polishing design sketch;
Fig. 5 is the effect contrast figure of the sol solutions that different condition prepares.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further details, and can not the present invention be limited.
Embodiment 1
First mix according to the mass ratio of 10:90 with technical grade pseudo-boehmite and deionized water.Then be placed in constant temperature blender with magnetic force and stir, make it to form uniform suspension.When the temperature of above-mentioned suspension rises to 50 ± 5 DEG C, in suspension, evenly add the HNO that concentration is 6%
3solution, and constantly stir, pseudo-boehmite colloidal sol can be obtained.
By above-mentioned colloidal sol by spray-dryer mist projection granulating.In the process, during mist projection granulating, spray pressure is 0.3MPa, and in moisture eliminator, temperature is 200 ± 5 DEG C.
Then after first the powder particle after above-mentioned granulation being placed in baking oven 80 DEG C of dry 3h, then being placed in retort furnace and calcining.After having calcined, with stove naturally cooling, Micro-nano spherical SG corundum abrasive can be obtained.
The sintering process of above-mentioned Micro-nano spherical SG corundum abrasive is: with the speed of 3-4 DEG C/min, rises to 1100 DEG C from room temperature, arrives after stablizing and is incubated 80-100min, finally naturally cool to room temperature.The particle diameter of obtained micro-nano spherical SG abrasive material is 5 ~ 7 μm.
Embodiment 2
First mix according to the mass ratio of 20:80 with technical grade pseudo-boehmite and deionized water.Then be placed in constant temperature blender with magnetic force and stir, make it to form uniform suspension.When the temperature of above-mentioned suspension rises to 45 ± 5 DEG C, in suspension, evenly add the HNO that concentration is 8%
3solution, constantly stirs obtained pseudo-boehmite colloidal sol.
By above-mentioned colloidal sol by spray-dryer mist projection granulating.In the process, during mist projection granulating, spray pressure is 0.4MPa, and in moisture eliminator, temperature is 185 ± 5 DEG C.
Then after first the powder particle after above-mentioned granulation being placed in baking oven 80 DEG C of dry 3h, then being placed in retort furnace and calcining.After having calcined, with stove naturally cooling, Micro-nano spherical SG corundum abrasive can be obtained.
The sintering process of above-mentioned micro-nano spherical SG abrasive material is: with the speed of 3-4 DEG C of min, rise to 1300 DEG C from room temperature, arrives after stablizing and is incubated 80-100min, finally naturally cool to room temperature.The particle diameter of obtained micro-nano spherical SG abrasive material is 6 ~ 10 μm.
Embodiment 3
First mix according to the mass ratio of 40:60 with technical grade pseudo-boehmite and deionized water.Then be placed in constant temperature blender with magnetic force and stir, make it to form uniform suspension.When the temperature of above-mentioned suspension rises to 55 ± 5 DEG C, in suspension, evenly add the HNO that concentration is 10%
3solution, continues to stir, the pseudo-boehmite colloidal sol that can make.
By above-mentioned colloidal sol by spray-dryer mist projection granulating.In the process, during mist projection granulating, spray pressure is 0.6MPa, and air inlet/outlet temperature is 200 ± 5 DEG C.
Then after first the powder particle after above-mentioned granulation being placed in baking oven 80 DEG C of dry 3h, then being placed in retort furnace and calcining.After having sintered, with stove naturally cooling.Micro-nano spherical SG corundum abrasive can be obtained.
The sintering process of above-mentioned micro-nano spherical SG abrasive material is: with the speed of 3-4 DEG C/min, rise to 900 DEG C from room temperature, and insulation 30min, then rises to 1300 DEG C with the speed of 3-4 DEG C/min, arrives after stablizing and is incubated 80-100min, finally naturally cool to room temperature.The particle diameter of obtained micro-nano spherical SG alumina grain is 4 ~ 5 μm.As Fig. 4 (a) and (b), (c) are respectively the effect schematic diagram of the steel plate without polishing, the steel plate through conventional abrasive material polishing and the steel plate through the micro-nano spherical SG abrasive polishing of the present invention.As can be seen from the figure, the sample board surface change through conventional abrasive material polishing is not little, and surface is more coarse; Through the sample board of micro-nano spherical SG abrasive polishing, cut is less, and cut is also more shallow, and sample board is close to minute surface.
Embodiment 4
The preparation of pseudo-boehmite sol solutions presoma
(1) preparation of the different sol solutions of solid content
Solid content has important impact to the stability of colloidal sol and gelation time, and it determines the stability that whether can form colloidal sol and form colloidal sol.Fixing glue solvent HNO
3add-on (concentration 10%) and envrionment temperature (50 DEG C) two conditions, technical grade pseudo-boehmite and deionized water are mixed according to the ratio of mass ratio 10 ~ 50:90 ~ 50, then be placed in constant temperature blender with magnetic force and stir, make it to form uniform suspension.Treat that the temperature of above-mentioned suspension rises to 50 DEG C, in its suspension, evenly drip quantitative HNO
3peptizing agent, thus the sol solutions that obtained solid content is different.The jelly time of the different sol solutions of Fig. 5 (a) solid content, viscosity profile figure.
(2) preparation of the different sol solutions of peptizing agent add-on
The peptization course of peptizing agent on pseudo-boehmite has larger impact, major cause is because the shape of the sol particles adopting different peptizing agents to obtain, size and character are all different. when preparing high phase oxidative Alumina gel, usual employing nitric acid or hydrochloric acid are used as peptizing agent, but go in order to avoid being incorporated in colloidal sol by unnecessary negative ion, so adopt nitric acid as peptizing agent.Fixed environment temperature (60 DEG C), mixes technical grade pseudo-boehmite and deionized water according to the ratio of mass ratio 20:80 respectively, is then placed in constant temperature blender with magnetic force and stirs, make it to form uniform suspension.Treating that the temperature of above-mentioned suspension rises to 60 DEG C, respectively to dripping peptizing agent (its concentration is 8%) 11 ~ 16ml in its suspension, both can obtain the different sol solutions of peptizing agent content.The jelly time of the sol solutions that Fig. 5 (b) peptizing agent add-on is different, viscosity inspection trend map.
(3) preparation of sol solutions under differing temps
Different temperature also has important impact to the colloidal property of prepared colloidal sol.Fixing glue solvent HNO
3add-on (concentration 10%), mixes technical grade pseudo-boehmite and deionized water according to the ratio of mass ratio 10:90 respectively, is then placed in constant temperature blender with magnetic force and stirs, make it to form uniform suspension.When the temperature of above-mentioned suspension rises to 40 ~ 90 DEG C, evenly drip quantitative HNO respectively in its suspension
3peptizing agent, thus the sol solutions under differing temps processed.The jelly time that Fig. 5 (c) is sol solutions under differing temps, viscosity measurements trend map.From figure known sol solutions best preparation temperature be 40 ~ 60 DEG C.
Claims (2)
1. a preparation method for Micro-nano spherical SG corundum abrasive, is characterized in that, comprises the following steps successively:
1) preparation of sol solutions: first technical grade pseudo-boehmite and deionized water are mixed according to the ratio of mass ratio 10 ~ 40:90 ~ 60, make finely dispersed suspension; Under 40-60 DEG C of condition, in the process constantly stirred, in suspension, add the HNO that mass concentration is 4% ~ 11%
3solution, until form even, milky colloidal sol;
2) granulation: adopt the mode of mist projection granulating to sol solutions mist projection granulating; Spray pressure during mist projection granulating is 0.2-0.6MPa, and drying temperature is 180-220 DEG C, and the size of granulation is 4 ~ 10 μm;
3) calcine: by the dry 1-3h at 80-100 DEG C of the particle after spraying dry before the calcining that heats up, then calcine, calcining process is: with the speed of 3-4 DEG C/min, rise to 1100-1300 DEG C from room temperature, arrive after stablizing and be incubated 80-100min, finally naturally cool to room temperature; Can obtain Micro-nano spherical SG corundum abrasive, described Micro-nano spherical SG corundum abrasive is α-Al
2o
3.
2. a Micro-nano spherical SG corundum abrasive, is characterized in that, is the Micro-nano spherical SG corundum abrasive be prepared from by method according to claim 1.
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| CN111019605A (en) * | 2019-12-05 | 2020-04-17 | 青岛瑞克尔新材料科技有限公司 | Ceramic microcrystalline abrasive material with low bulk density and preparation method of abrasive tool product thereof |
| CN111500198B (en) * | 2020-04-28 | 2021-06-11 | 青岛福禄泰科表面材料科技有限公司 | Composite polishing solution for blue glass optical filter and preparation method thereof |
| CN113979735A (en) * | 2021-11-26 | 2022-01-28 | 河南建筑材料研究设计院有限责任公司 | Method for preparing columnar and filiform ceramic abrasive by using amorphous granular microcrystalline ceramic abrasive precursor xerogel fine powder |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1631787A (en) * | 2004-11-26 | 2005-06-29 | 山东铝业股份有限公司 | Process for producing gama-alumina microsphere |
| CN101928029A (en) * | 2010-09-08 | 2010-12-29 | 苏州创元投资发展(集团)有限公司 | Method for preparing aluminum oxide sol |
| CN102295304A (en) * | 2011-06-14 | 2011-12-28 | 山东大学 | Preparation method of pseudo-boehmite and microcrystalline corundum abrasive |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1631787A (en) * | 2004-11-26 | 2005-06-29 | 山东铝业股份有限公司 | Process for producing gama-alumina microsphere |
| CN101928029A (en) * | 2010-09-08 | 2010-12-29 | 苏州创元投资发展(集团)有限公司 | Method for preparing aluminum oxide sol |
| CN102295304A (en) * | 2011-06-14 | 2011-12-28 | 山东大学 | Preparation method of pseudo-boehmite and microcrystalline corundum abrasive |
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Effective date of registration: 20160516 Address after: Zhongyuan District 450000 Henan city of Zhengzhou province sanshilipu Zheng Road northbound No. 168 Patentee after: ZHENGZHOU HONGJI ABRASIVE TECH CO., LTD. Address before: Yuelu District City, Hunan province 410082 Changsha Lushan Road No. 2 Patentee before: Hunan University |