CN103864430A - h-BN/Cr3C2 machinable ceramic preparation method - Google Patents

h-BN/Cr3C2 machinable ceramic preparation method Download PDF

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CN103864430A
CN103864430A CN201210535950.5A CN201210535950A CN103864430A CN 103864430 A CN103864430 A CN 103864430A CN 201210535950 A CN201210535950 A CN 201210535950A CN 103864430 A CN103864430 A CN 103864430A
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ceramic
cr3c2
coated
powder
processable
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CN103864430B (en
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唐竹兴
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Shandong University of Technology
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Shandong University of Technology
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Abstract

The invention relates to a h-BN/Cr3C2 machinable ceramic preparation method, which is characterized in that h-BN is adopted to coat Cr3C2 ceramic powder, cold isostatic pressing molding and hot pressing firing are sequentially performed to obtain the h-BN/Cr3C2 machinable ceramic, wherein boric acid, urea and ethanol are mixed in a sealed container according to a certain ratio to prepare an esterified solution, Cr3C2 ceramic powder is added to the esterified solution to prepare a ceramic slurry, the ceramic slurry is prepared into coated Cr3C2 powder through a spray granulator, the coated Cr3C2 powder is subjected to nitrogenization to obtain the h-BN-coated Cr3C2 ceramic powder, the h-BN-coated Cr3C2 ceramic powder is subjected to isostatic pressing to prepare a sheet blank, and the sheet blank is subjected to hot pressing under a nitrogen atmosphere and firing to obtain the h-BN/Cr3C2 machinable ceramic. The h-BN machinable ceramic has characteristics uniform phase distribution, controllable content, excellent workability, excellent mechanical property and excellent thermal property.

Description

A kind of h-BN/Cr 3c 2the preparation method of processable ceramic
Technical field
The present invention relates to a kind of h-BN/Cr 3c 2processable ceramic, belongs to ceramics processing field.
Background technology
Stupalith has many good performances, still, because stupalith hardness is large, while preparing precise measure ceramic component, only has by diamond abrasive wheel grinding, and manufacturing cost is very high.So people are finding a kind of method always, can meet basic mechanical performance requirement and can carry out again mechanical workout and obtain the method for precise measure ceramic component.The nineties in 20th century, the people such as Japanese scholars Niihara adopt Si 3n 4the coated h-BN of particle 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 is coated 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 fully grinding in mortar, with high-purity Al 2o 3(median size 03 μ m) puts into plastic tank take dehydrated alcohol as medium to powder together, uses aluminum oxide abrading-ball, and then wet-milling batch mixing dries (stirring) simultaneously, then ball milling, under hydrogen atmosphere, makes Al 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 by TiB 2, BN and Ni powder weigh by a certain percentage, respectively with different mixing method batch mixings, by mixed slurry dried and screened, and uniform compound packed in the graphite jig that scribbles BN, be placed in plasma discharge hot pressing furnace and 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 under nitrogen atmosphere and fires and make AlN-h-BN processable ceramic in " low-dielectric loss AIN pottery and the research of BN-AIN base ceramic material ".In above-mentioned system except Si 3n 4the bending strength of-h-BN processable ceramic can reach beyond 950MPa., as TiB 2-h-BN, the anti-intensity of the processable ceramics such as AlN-h-BN also only has 154 MPa. left and right.Therefore adopt the bending strength of processable ceramics material prepared by common mixing, chemical method h-BN coating technology lower.
Summary of the invention
The object of the present invention is to provide one can overcome above-mentioned defect, realize and prepare more high strength h-BN/Cr 3c 2the preparation method of processable ceramic.Its technical scheme is:
A kind of h-BN/Cr 3c 2the preparation method of processable ceramic, adopts the coated Cr of h-BN 3c 2h-BN/Cr is burnt till in ceramic powder hot pressing after cold isostatic compaction 3c 2processable ceramic, concrete grammar comprises the following steps:
The first step: by boric acid: the ratio of urea take weight ratio as 2:1 evenly mixed, and additional 30 ~ 60% ethanol 50 ~ 90 ℃ of heat treated in encloses container stir after 10 ~ 24 hours again makes esterification solution for 10 ~ 30 minutes;
Second step: be the Cr of 0.1 ~ 2 μ m by granularity 3c 2ceramic powder 40 ~ 70% joins ball milling in 30 ~ 60% above-mentioned esterification solution and makes ceramic size, then by sponging granulator, above-mentioned ceramic size is made to the coated Cr that diameter is 0.01 ~ 0.5mm 3c 2powder, by above-mentioned coated Cr 3c 2powder is that nitrogen atmosphere nitrogenize in 600 ~ 1000 ℃ × 30 ~ 60 minutes obtains the coated Cr of h-BN in temperature 3c 2ceramic powder, by coated h-BN Cr 3c 2ceramic powder is made 60 × 10 ~ 20mm flake shaped base substrate through isostatic cool pressing under the pressure of 100 ~ 200MPa., and then under 1700 ~ 1850 ℃ × 30 ~ 180 minutes nitrogen atmospheres, hot pressing 5 ~ 100MPa. is fired into h-BN/Cr 3c 2processable ceramic.
Compared with prior art, its advantage is in the present invention:
1, the present invention produces h-BN/Cr 3c 2processable ceramic uniform microstructure, intensity is high, and global reliability is high;
2, can form at Cr3C2 grain surface the h-BN layer of even thickness by this cladding process, and the thickness of h-BN layer is controlled, prepared h-BN/Cr 3c 2the bending strength of processable ceramic improves 1 times compared with mixing, chemical method;
3, h-BN/Cr 3c 2processable ceramic has good antioxidant property, mechanical property and thermal property.
Embodiment
embodiment 1
The first step: by boric acid: the ratio of urea take weight ratio as 2:1 evenly mixed, and additional 30% ethanol 50 ℃ of heat treated in encloses container stir after 24 hours again makes esterification solution for 30 minutes;
Second step: be the Cr of 0.1 μ m by granularity 3c 2ceramic powder 70% joins in 30% esterification solution and makes ceramic size, then by sponging granulator, above-mentioned ceramic size is made to the coated Cr that diameter is 0.5mm 3c 2powder, by above-mentioned coated Cr 3c 2powder is that nitrogen atmosphere nitrogenize in 600 ℃ × 30 minutes obtains the coated Cr of h-BN in temperature 3c 2ceramic powder, by coated h-BN Cr 3c 2ceramic powder is pressed into 60 × 10mm flake shaped base substrate at the inferior static pressure of pressure of 100MPa., and then under 1700 ℃ × 30 minutes nitrogen atmospheres, hot pressing 5MPa. is fired into h-BN/Cr 3c 2processable ceramic.
The purity of testing proportion material used is technical pure, the h-BN/ Cr obtaining 3c 2the bending strength of processable ceramic is 422MPa..
embodiment 2
The first step: by boric acid: the ratio of urea take weight ratio as 2:1 evenly mixed, and additional 45% ethanol 70 ℃ of heat treated in encloses container stir after 16 hours again makes esterification solution for 20 minutes;
Second step: be the Cr of 1 μ m by granularity 3c 2ceramic powder 55% joins in 45% esterification solution and makes ceramic size, then by sponging granulator, above-mentioned ceramic size is made to the coated Cr that diameter is 0.2mm 3c 2powder, by above-mentioned coated Cr 3c 2powder is that nitrogen atmosphere nitrogenize in 800 ℃ × 45 minutes obtains the coated Cr of h-BN in temperature 3c 2ceramic powder, by coated h-BN Cr 3c 2ceramic powder is pressed into 60 × 15mm flake shaped base substrate at the inferior static pressure of pressure of 150MPa., and then under 1800 ℃ × 105 minutes nitrogen atmospheres, hot pressing 50MPa. is fired into h-BN/Cr 3c 2processable ceramic.
The purity of testing proportion material used is technical pure, and the bending strength of the h-BN/Cr3C2 processable ceramic obtaining is 399MPa..
embodiment 3
The first step: by boric acid: the ratio of urea take weight ratio as 2:1 evenly mixed, and additional 60% ethanol 90 ℃ of heat treated in encloses container stir after 10 hours again makes esterification solution for 10 minutes;
Second step: be the Cr of 2 μ m by granularity 3c 2ceramic powder 40% joins in 60% esterification solution and makes ceramic size, then by sponging granulator, above-mentioned ceramic size is made to the coated Cr that diameter is 0.01mm 3c 2powder, by above-mentioned coated Cr 3c 2powder is that nitrogen atmosphere nitrogenize in 1000 ℃ × 60 minutes obtains the coated Cr of h-BN in temperature 3c 2ceramic powder, by coated h-BN Cr 3c 2ceramic powder is pressed into 60 × 20mm flake shaped base substrate at the inferior static pressure of pressure of 200MPa., and then under 1850 ℃ × 180 minutes nitrogen atmospheres, hot pressing 100MPa. is fired into h-BN/Cr 3c 2processable ceramic.
The purity of testing proportion material used is technical pure, the h-BN/Cr obtaining 3c 2the bending strength of processable ceramic is 360MPa..

Claims (1)

1. a h-BN/Cr 3c 2the preparation method of processable ceramic, is characterized in that: adopt the coated Cr of h-BN 3c 2h-BN/ Cr is burnt till in ceramic powder hot pressing after cold isostatic compaction 3c 2processable ceramic, concrete grammar comprises the following steps:
The first step: by boric acid: the ratio of urea take weight ratio as 2:1 evenly mixed, and additional 30 ~ 60% ethanol 50 ~ 90 ℃ of heat treated in encloses container stir after 10 ~ 24 hours again makes esterification solution for 10 ~ 30 minutes;
Second step: be the Cr of 0.1 ~ 2 μ m by granularity 3c 2ceramic powder 40 ~ 70% joins ball milling in 30 ~ 60% above-mentioned esterification solution and makes ceramic size, then by sponging granulator, above-mentioned ceramic size is made to the coated Cr that diameter is 0.01 ~ 0.5mm 3c 2powder, by above-mentioned coated Cr 3c 2powder is that nitrogen atmosphere nitrogenize in 600 ~ 1000 ℃ × 30 ~ 60 minutes obtains the coated Cr3C2 ceramic powder of h-BN in temperature, by coated h-BN Cr 3c 2ceramic powder is made 60 × 10 ~ 20mm flake shaped base substrate through isostatic cool pressing under the pressure of 100 ~ 200MPa., and then under 1700 ~ 1850 ℃ × 30 ~ 180 minutes nitrogen atmospheres, hot pressing 5 ~ 100MPa. is fired into h-BN/ Cr 3c 2processable ceramic.
CN201210535950.5A 2012-12-13 2012-12-13 h-BN/Cr3C2 machinable ceramic preparation method Expired - Fee Related CN103864430B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110371978A (en) * 2019-07-01 2019-10-25 武汉科技大学 Chromium carbide based on chromium aluminium carbon-aluminium nitride composite granule and preparation method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101862825A (en) * 2009-04-17 2010-10-20 上海宝钢设备检修有限公司 Metal ceramic powder for thermal spraying and preparation method thereof
CN102964126A (en) * 2012-12-13 2013-03-13 山东理工大学 Preparation method of h-BN/VB2 processable ceramic
CN102976761A (en) * 2012-12-13 2013-03-20 山东理工大学 Preparation method of h-BN (hexagonal boron nitride)/ZrC machinable ceramics
CN102992768A (en) * 2012-12-13 2013-03-27 山东理工大学 Preparation method of h-BN / HfC machinable ceramic
CN103011826A (en) * 2012-12-13 2013-04-03 山东理工大学 Preparation method of h-BN/ZrB2 machinable ceramics

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101862825A (en) * 2009-04-17 2010-10-20 上海宝钢设备检修有限公司 Metal ceramic powder for thermal spraying and preparation method thereof
CN102964126A (en) * 2012-12-13 2013-03-13 山东理工大学 Preparation method of h-BN/VB2 processable ceramic
CN102976761A (en) * 2012-12-13 2013-03-20 山东理工大学 Preparation method of h-BN (hexagonal boron nitride)/ZrC machinable ceramics
CN102992768A (en) * 2012-12-13 2013-03-27 山东理工大学 Preparation method of h-BN / HfC machinable ceramic
CN103011826A (en) * 2012-12-13 2013-04-03 山东理工大学 Preparation method of h-BN/ZrB2 machinable ceramics

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110371978A (en) * 2019-07-01 2019-10-25 武汉科技大学 Chromium carbide based on chromium aluminium carbon-aluminium nitride composite granule and preparation method thereof
CN110371978B (en) * 2019-07-01 2022-10-11 武汉科技大学 Chromium carbide-aluminum nitride composite powder based on chromium-aluminum-carbon and preparation method thereof

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