CN102992776A - Preparation method of h-BN/VC machinable ceramic - Google Patents
Preparation method of h-BN/VC machinable ceramic Download PDFInfo
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- CN102992776A CN102992776A CN2012105355523A CN201210535552A CN102992776A CN 102992776 A CN102992776 A CN 102992776A CN 2012105355523 A CN2012105355523 A CN 2012105355523A CN 201210535552 A CN201210535552 A CN 201210535552A CN 102992776 A CN102992776 A CN 102992776A
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Abstract
The invention relates to a preparation method of an h-BN/VC machinable ceramic. The method is characterized in that the h-BN/VC machinable ceramic is obtained via hot-pressing and sintering after a cold isostatic pressing process by using h-BN coated VC ceramic powder. The method comprises the steps of mixing boric acid, urea and ethanol in a sealed container according to a proportion to form an esterification solution; adding VC ceramic powder in the esterification solution to form ceramic slurry; making the ceramic slurry into coated VC powder by using a spray granulator; nitriding the coated VC powder to obtain the h-BN coated VC ceramic powder; pressing the h-BN coated VC ceramic powder into sheet green bodies via an isostatic pressing process; hot-pressing the sheet green bodies under a nitrogen atmosphere; and sintering into the h-BN/VC machinable ceramic. The machinable ceramic obtained by the method has uniform h-BN phase distribution, controllable content, good machinable property, good mechanical properties and excellent thermal properties.
Description
Technical field
The present invention relates to a kind of h-BN/VC processable ceramic, belong to the ceramics processing field.
Background technology
Stupalith has many good performances, still, because stupalith hardness is large, during preparation precise measure ceramic component, only has by the diamond abrasive wheel grinding, and manufacturing cost is very high.So people are seeking a kind of method always, namely can satisfy the basic mechanical performance requirement and can carry out again the method that mechanical workout obtains the precise measure ceramic component.The nineties in 20th century, the people such as Japanese scholars Niihara adopt Si
3N
4Particle coats h-BN and prepares the high processable ceramic parts of intensity, for a new way has been opened up in the preparation of high-performance processable ceramic parts; 2002, Li Yongli etc. were at " the Al that nanometer BN coats
2O
3The preparation of composite powder and sintering character research thereof " the middle analytical reagent CO (N that adopts
2)
2And H
3BO
3Mix with mol ratio 1:4, after in mortar, fully grinding, with high-purity Al
2O
3Powder (median size 03 μ m) is put into plastic tank together take dehydrated alcohol as medium, uses the aluminum oxide abrading-ball, the wet-milling batch mixing, and then oven dry (stirring simultaneously), ball milling is made Al under hydrogen atmosphere again
2O
3-h-BN processable ceramic; The Dong Yan tinkling of pieces of jade in 2004 etc. are at " TiB
2The preparation technology of one BN complex phase ceramic and performance study " in TiB
2, BN and the by a certain percentage weighing of Ni powder, respectively with different mixing method batch mixings, with the mixed slurry dried and screened, and uniform compound packed into scribble in the graphite jig of BN, place the plasma discharge hot pressing furnace to carry out sintering in the protection of Ar gas and prepare TiB
2-h-BN processable ceramic parts; 2009, Zhang Juxian adopted boric acid and urea and AlN powder to be blended in to fire under the nitrogen atmosphere in " low-dielectric loss AIN pottery and the research of BN-AIN base ceramic material " and makes the AlN-h-BN processable ceramic.In above-mentioned system except Si
3N
4The bending strength of-h-BN processable ceramic can reach beyond the 950MPa., such as TiB
2-h-BN, the anti-intensity of the processable ceramics such as AlN-h-BN also only has about 154 MPa..Therefore adopt the bending strength of processable ceramics material of common mixing, the preparation of chemical method h-BN coating technology lower.
Summary of the invention
The object of the present invention is to provide and a kind ofly can overcome defects, realize preparing the more preparation method of high strength h-BN/VC processable ceramic.Its technical scheme is:
A kind of preparation method of h-BN/VC processable ceramic adopts h-BN to coat the hot pressing behind cold isostatic compaction of VC ceramic powder and burns till the h-BN/VC processable ceramic, and concrete grammar may further comprise the steps:
The first step: with boric acid: the ratio of urea take weight ratio as 2:1 evenly mixed, add 30 ~ 60% ethanol in encloses container 50 ~ 90 ℃ of heat treated after 10 ~ 24 hours restir made esterification solution in 10 ~ 30 minutes;
Second step: be that the VC ceramic powder 40 ~ 70% of 0.1 ~ 2 μ m joins in 30 ~ 60% the above-mentioned esterification solution ball milling and makes ceramic size with granularity; then by sponging granulator above-mentioned ceramic size is made the coating VC powder that diameter is 0.01 ~ 0.5mm; be that nitrogen atmosphere nitrogenize in 600 ~ 1000 ℃ * 30 ~ 60 minutes obtains h-BN and coats the VC ceramic powder with above-mentioned coating VC powder in temperature; h-BN is coated the VC ceramic powder make 60 * 10 ~ 20mm flake shaped base substrate through isostatic cool pressing under the pressure of 100 ~ 200MPa., then hot pressing 5 ~ 100MPa. is fired into the h-BN/VC processable ceramic under 1700 ~ 1850 ℃ * 30 ~ 180 minutes nitrogen atmospheres.
The present invention compared with prior art, its advantage is:
1, the present invention produces h-BN/VC processable ceramic uniform microstructure, and intensity is high, and global reliability is high;
2, can form at the VC grain surface h-BN layer of even thickness by this cladding process, and the thickness of h-BN layer is controlled, the bending strength of prepared h-BN/VC processable ceramic is compared with mixing, chemical method and is improved 1.5 times;
3, the h-BN/VC processable ceramic has good antioxidant property, mechanical property and thermal property.
Embodiment
Embodiment 1
The first step: with boric acid: the ratio of urea take weight ratio as 2:1 evenly mixed, add 30% ethanol in encloses container 50 ℃ of heat treated after 24 hours restir made esterification solution in 30 minutes;
Second step: be that the VC ceramic powder 70% of 0.1 μ m joins in 30% the esterification solution and makes ceramic size with granularity; then by sponging granulator above-mentioned ceramic size is made the coating VC powder that diameter is 0.5mm; be that nitrogen atmosphere nitrogenize in 600 ℃ * 30 minutes obtains h-BN and coats the VC ceramic powder with above-mentioned coating VC powder in temperature; h-BN is coated the VC ceramic powder be pressed into 60 * 10 ~ 20mm flake shaped base substrate at the inferior static pressure of the pressure of 100MPa., then hot pressing 5MPa. is fired into the h-BN/VC processable ceramic under 1700 ℃ * 30 minutes nitrogen atmospheres.
The purity of testing used proportion material is technical pure, and the bending strength of the h-BN/ VC processable ceramic that obtains is 491MPa..
Embodiment 2
The first step: with boric acid: the ratio of urea take weight ratio as 2:1 evenly mix add 45% ethanol in encloses container 70 ℃ of heat treated after 16 hours restir made esterification solution in 20 minutes;
Second step: be that the VC ceramic powder 55% of 1 μ m joins in 45% the esterification solution and makes ceramic size with granularity; then by sponging granulator above-mentioned ceramic size is made the coating VC powder that diameter is 0.2mm; be that nitrogen atmosphere nitrogenize in 800 ℃ * 45 minutes obtains h-BN and coats the VC ceramic powder with above-mentioned coating VC powder in temperature; h-BN is coated the VC ceramic powder be pressed into 60 * 10 ~ 20mm flake shaped base substrate at the inferior static pressure of the pressure of 150MPa., then hot pressing 50MPa. is fired into the h-BN/VC processable ceramic under 1800 ℃ * 105 minutes nitrogen atmospheres.
The purity of testing used proportion material is technical pure, and the bending strength of the h-BN/ VC processable ceramic that obtains is 426MPa..
Embodiment 3
The first step: with boric acid: the ratio of urea take weight ratio as 2:1 evenly mixed, add 60% ethanol in encloses container 90 ℃ of heat treated after 10 hours restir made esterification solution in 10 minutes;
Second step: be that the VC ceramic powder 40% of 2 μ m joins in 60% the esterification solution and makes ceramic size with granularity; then by sponging granulator above-mentioned ceramic size is made the coating VC powder that diameter is 0.01mm; be that nitrogen atmosphere nitrogenize in 1000 ℃ * 60 minutes obtains h-BN and coats the VC ceramic powder with above-mentioned coating VC powder in temperature; h-BN is coated the VC ceramic powder be pressed into 60 * 10 ~ 20mm flake shaped base substrate at the inferior static pressure of the pressure of 200MPa., then hot pressing 100MPa. is fired into the h-BN/VC processable ceramic under 1850 ℃ * 180 minutes nitrogen atmospheres.
The purity of testing used proportion material is technical pure, and the bending strength of the h-BN/ VC processable ceramic that obtains is 386MPa..
Claims (1)
1. the preparation method of a h-BN/VC processable ceramic is characterized in that: adopt h-BN to coat the hot pressing behind cold isostatic compaction of VC ceramic powder and burn till the h-BN/VC processable ceramic, concrete grammar may further comprise the steps:
The first step: with boric acid: the ratio of urea take weight ratio as 2:1 evenly mixed, add 30 ~ 60% ethanol in encloses container 50 ~ 90 ℃ of heat treated after 10 ~ 24 hours restir made esterification solution in 10 ~ 30 minutes;
Second step: be that the VC ceramic powder 40 ~ 70% of 0.1 ~ 2 μ m joins in 30 ~ 60% the above-mentioned esterification solution ball milling and makes ceramic size with granularity; then by sponging granulator above-mentioned ceramic size is made the coating VC powder that diameter is 0.01 ~ 0.5mm; be that nitrogen atmosphere nitrogenize in 600 ~ 1000 ℃ * 30 ~ 60 minutes obtains h-BN and coats the VC ceramic powder with above-mentioned coating VC powder in temperature; h-BN is coated the VC ceramic powder make 60 * 10 ~ 20mm flake shaped base substrate through isostatic cool pressing under the pressure of 100 ~ 200MPa., then hot pressing 5 ~ 100MPa. is fired into the h-BN/VC processable ceramic under 1700 ~ 1850 ℃ * 30 ~ 180 minutes nitrogen atmospheres.
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| CN102992776B CN102992776B (en) | 2013-12-04 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103964855A (en) * | 2014-04-02 | 2014-08-06 | 芜湖浙鑫新能源有限公司 | Coated zirconium boride based core and preparation method thereof |
| CN103964857A (en) * | 2014-04-02 | 2014-08-06 | 芜湖浙鑫新能源有限公司 | Coated boron nitride based core and preparation method thereof |
| CN107382325A (en) * | 2017-06-12 | 2017-11-24 | 金华中烨超硬材料有限公司 | A kind of high-end cutter polycrystalline cubic boron nitride compound sheets and its production method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1562885A (en) * | 2004-04-14 | 2005-01-12 | 哈尔滨工业大学 | Method preparing BN/SiO2 composite ceramics through dipping, and cracking precursor body |
| CN1752049A (en) * | 2005-08-08 | 2006-03-29 | 河南莱盟特磨料磨具有限公司 | Cubic boron nitride ceramic binder parallel abrasion wheel and its production method |
| CN1778768A (en) * | 2004-11-22 | 2006-05-31 | 刘书锋 | Ultra-pressure sintered dense solid knife from polycrystalline integrated cubic boron nitride and production thereof |
-
2012
- 2012-12-13 CN CN2012105355523A patent/CN102992776B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1562885A (en) * | 2004-04-14 | 2005-01-12 | 哈尔滨工业大学 | Method preparing BN/SiO2 composite ceramics through dipping, and cracking precursor body |
| CN1778768A (en) * | 2004-11-22 | 2006-05-31 | 刘书锋 | Ultra-pressure sintered dense solid knife from polycrystalline integrated cubic boron nitride and production thereof |
| CN1752049A (en) * | 2005-08-08 | 2006-03-29 | 河南莱盟特磨料磨具有限公司 | Cubic boron nitride ceramic binder parallel abrasion wheel and its production method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103964855A (en) * | 2014-04-02 | 2014-08-06 | 芜湖浙鑫新能源有限公司 | Coated zirconium boride based core and preparation method thereof |
| CN103964857A (en) * | 2014-04-02 | 2014-08-06 | 芜湖浙鑫新能源有限公司 | Coated boron nitride based core and preparation method thereof |
| CN103964857B (en) * | 2014-04-02 | 2016-05-18 | 芜湖浙鑫新能源有限公司 | A kind of cladded type boron nitride-base core and preparation method thereof |
| CN107382325A (en) * | 2017-06-12 | 2017-11-24 | 金华中烨超硬材料有限公司 | A kind of high-end cutter polycrystalline cubic boron nitride compound sheets and its production method |
| CN107382325B (en) * | 2017-06-12 | 2020-04-21 | 金华中烨超硬材料有限公司 | Polycrystalline cubic boron nitride composite sheet for high-end cutter and production method thereof |
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