CN101503301B - Cooling toughening sintering aid for sintering boron carbide and preparation - Google Patents
Cooling toughening sintering aid for sintering boron carbide and preparation Download PDFInfo
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- CN101503301B CN101503301B CN2009100715766A CN200910071576A CN101503301B CN 101503301 B CN101503301 B CN 101503301B CN 2009100715766 A CN2009100715766 A CN 2009100715766A CN 200910071576 A CN200910071576 A CN 200910071576A CN 101503301 B CN101503301 B CN 101503301B
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- boron carbide
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Abstract
The invention provides a cooling toughening sintering aid for sintering boron carbide. The sintering aid is prepared by 8.1 to 8.2 portions of Al powder, 5.8 to 6 portions of carbon black and 1 to 1.2 portions of B4C by mol portion. The sintering aid is prepared by the following steps: mixing boron carbide powder, the carbon black, aluminium powder and absolute ethanol, and carrying out ball milling and drying on the mixture; then, manufacturing the dried powder into a preformed blank in a graphite mold; placing the preformed blank in a vacuum hot-pressing furnace to be subjected to a multi-mechanism sintering reaction; cooling the sample to room temperature with the furnace after the sintering reaction is finished so as to obtain a porous block material; and grinding the porous material into powder to obtain the required sintering aid containing boron-aluminum-carbon. The boron-aluminum-carbon taken as the sintering aid and reinforcing phase of boron carbine solves the problems of high sintering temperature and poor mechanical performance of the product in the process of preparing the boron carbide product.
Description
One, technical field
What the present invention relates to is the cooling toughening sintering aid that a kind of sintering boron carbide is used.The invention still further relates to the preparation method of this sintering aid.
Two, background technology
Boron carbide material has excellent abrasive, oxidation-resistance, chemical stability and neutron absorptive character.It is widely used in fields such as machinery, chemical industry, aerospace and nuclear defence.The sintering temperature (2200-2240 ℃) that the arts demand of traditional preparation process norbide is higher, but the density of acquisition goods is low, intensity is low, fracture toughness property is low.Therefore influenced the application of boron carbide material.
Three, summary of the invention
The object of the present invention is to provide a kind of sintering temperature that can reduce norbide, strengthen the cooling toughening sintering aid that the flexible sintering boron carbide of boron carbide product is used.The object of the invention also is to provide the preparation method of the cooling toughening sintering aid that a kind of sintering boron carbide uses.
The object of the present invention is achieved like this:
The cooling toughening sintering aid that sintering boron carbide of the present invention is used is to be the Al powder of 8.1-8.2 part, the carbon black of 5.8-6 part and the B of 1-1.2 part by molfraction
4C makes.
The preparation method of the cooling toughening sintering aid that sintering boron carbide of the present invention is used is as follows:
1), with the Al powder of 8.1-8.2 molar part, the carbon black of 5.8-6 molar part and the B of 1-1.2 molar part
4C mixes, and is immersed in then in the dehydrated alcohol, and dehydrated alcohol liquid level height is 4/3～3/2 times of mixed powder height, dries powder after ball milling 12-24 hour again;
2), the powder after will drying puts into the graphite jig that diameter is 10-55mm, at room temperature, pressure be to make preform under the condition of 4MPa-5MPa;
3), preform put into vacuum hotpressing stove in company with graphite jig vacuumize processing, sintering subsequently heats up;
4), sinter machine is made as: the heat-up rate of room temperature-100 ℃ is 5 ℃/min, and 100-1500 ℃ heat-up rate is 15 ℃/min, and 550 ℃ of insulations 30 minutes, again 1500 ℃ of insulations after 60 minutes, furnace cooling promptly got the sintering aid material to room temperature during sintering.
Sintering aid material of the present invention is a principal crystalline phase with boron aluminium carbon, and it has high-melting-point, high strength, low density, low thermal coefficient of expansion and excellent antioxidant property.Boron aluminium carbon exists with liquid form in the time of more than 1800 ℃, just because of the appearance of liquid phase, has reduced the sintering temperature of norbide, has promoted the densification of norbide, and the effect that also has highly malleablized of the boron aluminium carbon of disperse in matrix.It should be noted that and adopt the sintering aid of patent preparation of the present invention in toughness reinforcing cooling, can when sintering boron carbide, not introduce any impurity element.
It is sintering aid and the wild phase of the double carbide of boron aluminium carbon as norbide that the present invention has adopted principal crystalline phase, has solved the problem for preparing boron carbide product sintering temperature height, goods poor mechanical property.
Four, embodiment
For example the present invention is further described below, technical solution of the present invention is not limited to following cited embodiment, also comprises the arbitrary combination between each embodiment.
Embodiment one: the sintering aid material is pressed the mole umber by the Al powder of 8.1-8.2 part, the carbon black of 5.8-6 part, the B of 1-1.2 part in the present embodiment
4C makes.
Embodiment two: present embodiment and embodiment one are different be the sintering aid material by the mole umber by the Al powder of 8.1-8.2 part, the carbon black of 5.9-6 part, the B of 1-1.1 part
4C makes.
Embodiment three: present embodiment and embodiment one are different be the sintering aid material by the mole umber by 8.2 parts Al powder, 6 parts carbon black, 1 part B
4C makes.
Embodiment four: present embodiment and embodiment one are different be the sintering aid material by the mole umber by 8.1 parts Al powder, 5.9 parts carbon black, 1.1 parts B
4C makes.
Embodiment five: the sintering aid preparation methods is as follows in the present embodiment: one, with the Al powder of 8.1-8.2 molar part, the carbon black of 5.8-6 molar part, the B of 1-1.2 molar part
4C mixes, and is immersed in then in the dehydrated alcohol, and dehydrated alcohol liquid level height is 4/3～3/2 times of mixed powder height, dries powder after ball milling 12-24 hour again; Two, the powder after will drying is put into the graphite jig that diameter is 10-55, in room temperature pressure is to make preform under the condition of 4MPa-5MPa; Three, preform is put into vacuum hotpressing stove in company with graphite jig and vacuumize processing, sintering subsequently heats up; Four, sinter machine is made as: the heat-up rate of room temperature-100 ℃ is 5 ℃/min, and 100-1500 ℃ heat-up rate is 15 ℃/min, and 550 ℃ of insulations 30 minutes, again 1500 ℃ of insulations after 60 minutes, furnace cooling promptly got the sintering aid material to room temperature during sintering.
Embodiment six: what present embodiment and embodiment five were different is with the Al powder of 8.1-8.2 molar part, the carbon black of 5.8-6 molar part, the B of 1-1.2 molar part in the step 1
4C mixes.Other is identical with embodiment five.
Embodiment seven: what present embodiment and embodiment five were different is with the Al powder of 8.2 molar part, the carbon black of 6 molar part, the B of 1 molar part in the step 1
4C mixes.Other is identical with embodiment five.
Embodiment eight: what present embodiment and embodiment five were different is with the Al powder of 8.1 molar part, the carbon black of 5.9 molar part, the B of 1.1 molar part in the step 1
4C mixes.Other is identical with embodiment five.
Embodiment nine: what present embodiment and embodiment five were different is that preparation precast billet pressure is 5MPa in the step 2.Other is identical with embodiment five.
Claims (5)
1. the preparation method of the cooling toughening sintering aid used of a sintering boron carbide is characterized in that:
1), with the Al powder of 8.1-8.2 molar part, the carbon black of 5.8-6 molar part and the B of 1-1.2 molar part
4C mixes, and is immersed in then in the dehydrated alcohol, and dehydrated alcohol liquid level height is 4/3～3/2 times of mixed powder height, dries powder after ball milling 12-24 hour again;
2), the powder after will drying puts into the graphite jig that diameter is 10-55mm, at room temperature, pressure be to make preform under the condition of 4MPa-5MPa;
3), preform put into vacuum hotpressing stove in company with graphite jig vacuumize processing, sintering subsequently heats up;
4), sinter machine is made as: the heat-up rate of room temperature-100 ℃ is 5 ℃/min, and 100-1500 ℃ heat-up rate is 15 ℃/min, and 550 ℃ of insulations 30 minutes, again 1500 ℃ of insulations after 60 minutes, furnace cooling promptly got the sintering aid material to room temperature during sintering.
2. the preparation method of the cooling toughening sintering aid that sintering boron carbide according to claim 1 is used is characterized in that in the step 1) the Al powder of 8.1-8.2 molar part, the carbon black of 5.9-6 molar part, the B of 1-1.1 molar part
4C mixes.
3. the preparation method of the cooling toughening sintering aid that sintering boron carbide according to claim 1 is used is characterized in that in the step 1) the Al powder of 8.2 molar part, the carbon black of 6 molar part, the B of 1 molar part
4C mixes.
4. the preparation method of the cooling toughening sintering aid that sintering boron carbide according to claim 1 is used is characterized in that in the step 1) the Al powder of 8.1 molar part, the carbon black of 5.9 molar part, the B of 1.1 molar part
4C mixes.
5. the preparation method of the cooling toughening sintering aid of using according to any one described sintering boron carbide of claim 1-4 is characterized in that step 2) in pressure be 5MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2009100715766A CN101503301B (en) | 2009-03-19 | 2009-03-19 | Cooling toughening sintering aid for sintering boron carbide and preparation |
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| CN2009100715766A CN101503301B (en) | 2009-03-19 | 2009-03-19 | Cooling toughening sintering aid for sintering boron carbide and preparation |
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| CN101503301A CN101503301A (en) | 2009-08-12 |
| CN101503301B true CN101503301B (en) | 2011-08-03 |
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| CN2009100715766A Expired - Fee Related CN101503301B (en) | 2009-03-19 | 2009-03-19 | Cooling toughening sintering aid for sintering boron carbide and preparation |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102320836B (en) * | 2011-08-10 | 2013-03-20 | 武汉钢铁(集团)公司 | Blast furnace tuyere boron carbide ceramic liner and preparation method thereof |
| CN103613389B (en) * | 2013-11-29 | 2015-11-25 | 宁波伏尔肯机械密封件制造有限公司 | Sinter of Boron Carbide Ceramics preparation method |
| CN104030687B (en) * | 2014-04-28 | 2015-12-09 | 宁波东联密封件有限公司 | A kind of silicon carbide ceramics and low-temperature sintering method thereof |
| CN107840661A (en) * | 2017-10-27 | 2018-03-27 | 浙江立泰复合材料股份有限公司 | A kind of preparation method of boron carbide ceramics piece |
| CN107973608A (en) * | 2017-11-22 | 2018-05-01 | 中国兵器科学研究院宁波分院 | A kind of toughening sintering aid of sintering boron carbide ceramic under constant pressure and preparation method thereof |
| CN108285337A (en) * | 2018-04-04 | 2018-07-17 | 宜兴市国强炉业有限公司 | A kind of cooling activeness and quietness corundum wear-resistant material and preparation method thereof |
| CN109467446A (en) * | 2018-10-17 | 2019-03-15 | 中国兵器科学研究院宁波分院 | A kind of toughening sintering aid and preparation method thereof of hot pressed sintering boron carbide ceramics |
| CN110204337B (en) * | 2019-06-04 | 2021-04-30 | 中南大学 | Preparation method of boron carbide ceramic material for aerospace gyroscope bearing and boron carbide ceramic material |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1098708A (en) * | 1993-05-27 | 1995-02-15 | 贾开印 | Electrically conductive high strength dense ceramic |
| US6245439B1 (en) * | 1994-08-09 | 2001-06-12 | Kabushiki Kaisha Toyoyta Chuo Kenkyusho | composite material and method for the manufacture |
| US20060188348A1 (en) * | 2005-02-23 | 2006-08-24 | Kennametal Inc. | Alumina-boron carbide ceramics and methods of making and using the same |
-
2009
- 2009-03-19 CN CN2009100715766A patent/CN101503301B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1098708A (en) * | 1993-05-27 | 1995-02-15 | 贾开印 | Electrically conductive high strength dense ceramic |
| US6245439B1 (en) * | 1994-08-09 | 2001-06-12 | Kabushiki Kaisha Toyoyta Chuo Kenkyusho | composite material and method for the manufacture |
| US20060188348A1 (en) * | 2005-02-23 | 2006-08-24 | Kennametal Inc. | Alumina-boron carbide ceramics and methods of making and using the same |
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