WO2014061898A1 - 탄화규소 분말 및 그의 제조 방법 - Google Patents
탄화규소 분말 및 그의 제조 방법 Download PDFInfo
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- WO2014061898A1 WO2014061898A1 PCT/KR2013/006163 KR2013006163W WO2014061898A1 WO 2014061898 A1 WO2014061898 A1 WO 2014061898A1 KR 2013006163 W KR2013006163 W KR 2013006163W WO 2014061898 A1 WO2014061898 A1 WO 2014061898A1
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- C04B35/56—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides
- C04B35/565—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide
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Definitions
- the present invention relates to a silicon carbide powder and a method for producing the same, and more particularly, to a method for producing granular silicon carbide powder using fine silicon carbide powder.
- Silicon carbide has high temperature strength, and is excellent in wear resistance, oxidation resistance, corrosion resistance, creep resistance, and the like. Silicon carbide has a ⁇ phase having a cubic crystal structure and an ⁇ phase having a hexagonal crystal structure. The ⁇ phase is stable at a temperature range of 1400-1800 ° C., and the ⁇ phase is stable at 2000 ° C. or higher.
- Silicon carbide is widely used as an industrial structural material, and has recently been applied to the semiconductor industry. For this purpose, silicon carbide powder of high purity stable at high temperature is required.
- Silicon carbide powder can be produced by, for example, the Acheson method, carbon heat reduction method, CVD (Chemical Vapor Deposition) method and the like.
- the silicon carbide powder can be obtained by thermal carbon reduction of the silicon source and the carbon source at a high temperature (for example, 2200 ° C to 2400 ° C).
- the silicon carbide powder prepared according to this is low in purity and requires a separate high purity treatment.
- the ⁇ -phase silicon carbide has a lower vapor pressure than the ⁇ -phase silicon carbide. Therefore, when the ⁇ phase silicon carbide powder is heat-treated at a high temperature, the ⁇ phase silicon carbide evaporates and condenses into the ⁇ phase silicon carbide powder. At this time, if the heat treatment time is short, there is a problem that the ⁇ phase and ⁇ phase is mixed, and if the heat treatment time is long, high purity silicon carbide powder of ⁇ phase can be obtained, but there is a problem of overgrowth to a particle size of several hundred ⁇ m or more.
- the technical problem to be achieved by the present invention is to provide a high-purity silicon carbide powder stable at high temperatures and a method for producing the same.
- Another object of the present invention is to provide a method for producing silicon carbide powder of various particle sizes.
- Silicon carbide powder production method includes the step of adding a seed to the beta-phase silicon carbide powder, and the step of heat-treating the beta-phase silicon carbide powder to form an alpha-phase silicon carbide powder.
- the heat treatment may be performed at 2000 ° C. to 2200 ° C. for at least 4 hours.
- the particle size of the alpha phase silicon carbide powder can be adjusted according to the amount of seed added.
- the amount of seed added may be 1wt% to 7wt% with respect to the beta-phase silicon carbide powder.
- the seed added may be alpha phase silicon carbide.
- the silicon carbide powder according to another embodiment of the present invention includes an alpha phase silicon carbide powder having a particle size (D50) of 45 ⁇ m to 110 ⁇ m and containing impurities of 10 ppm or less.
- the silicon carbide powder according to another embodiment of the present invention includes an alpha phase silicon carbide powder having a particle size (D50) of greater than 0 ⁇ m and less than or equal to 45 ⁇ m, and includes a first group containing impurities of 10 ppm or less, and having a particle size of greater than 45 ⁇ m and greater than 75
- a second group containing alpha-phase silicon carbide powder having a particle size of less than or equal to ⁇ m, including a second group containing impurities of 10 ppm or less, and a third group containing an alpha phase silicon carbide powder having a particle size of greater than 75 ⁇ m and less than 110 ⁇ m, and containing impurities of 10 ppm or less At least one group selected from:
- the first group, the second group, and the third group may be divided according to the amount of seeds added in the preparation of the alpha-phase silicon carbide powder.
- high purity silicon carbide powder stable at high temperature can be obtained.
- the particle size of the silicon carbide powder obtained can be adjusted by adjusting the heat treatment conditions and the ratio of seeds.
- FIG. 1 is a flowchart illustrating a method of manufacturing silicon carbide powder according to an embodiment of the present invention.
- FIG. 2 shows the results of Comparative Example 1
- FIG. 3 shows the results of Comparative Example 2
- FIG. 4 shows the results of Comparative Example 3
- FIG. 5 is a graph showing the particle size distribution according to Comparative Example 3.
- FIG. 6 shows the results of Example 1
- FIG. 7 shows the results of Example 2
- FIG. 8 shows the results of Example 3
- FIG. 9 shows the results of Example 4.
- FIG. 10 is a graph showing a particle size distribution of Example 1
- FIG. 11 is a graph showing a particle size distribution of Example 2
- FIG. 12 is a graph showing a particle size distribution of Example 3
- FIG. 13 is a particle size of Example 4 Graph showing the distribution.
- ordinal numbers such as second and first
- first and second components may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
- second component may be referred to as the first component, and similarly, the first component may also be referred to as the second component.
- high purity ⁇ phase silicon carbide powder When the high purity ⁇ phase silicon carbide powder is heat-treated at high temperature, high purity ⁇ phase silicon carbide powder can be obtained.
- the process of evaporating silicon carbide of the ⁇ phase and condensation into the silicon carbide of the ⁇ phase there is a section in which the silicon carbide of the ⁇ phase and the silicon carbide of the ⁇ phase are mixed. Therefore, in order to obtain high purity ⁇ -phase silicon carbide powder, it is necessary to maintain the heat treatment for a predetermined time. By the way, if heat treatment is maintained for a predetermined time, ⁇ phase silicon carbide of excessive granules (eg, 150 ⁇ m or more) is obtained.
- excessive granules eg, 150 ⁇ m or more
- the ⁇ -phase silicon carbide powder is heat-treated at a high temperature to obtain stable ⁇ -phase silicon carbide powder at high temperature.
- a seed is added to the silicon carbide of the ⁇ -phase.
- FIG. 1 is a flowchart showing a method for producing the silicon carbide powder of the present invention.
- the silicon carbide powder on ⁇ may be obtained by mixing a silicon source and a carbon source, and then heat treating the mixed powder.
- Silicon sources are one of various materials that can provide silicon.
- the silicon source may be, for example, one or more selected from the group consisting of fumed silica, fine silica, silica sol, silica gel, quartz powder and mixtures thereof.
- the carbon source may be a solid carbon source or an organic carbon compound.
- the solid carbon source may be, for example, one or more selected from the group consisting of graphite, carbon black, carbon nanotubes (CNTs), fullerenes, and mixtures thereof.
- the organic carbon compound is phenol resin, franc resin, xylene resin, polyimide, polyurethane, polyvinyl alcohol, polyacrylonitrile It may be at least one selected from the group consisting of polyvinyl acetate, cellulose and mixtures thereof.
- the silicon source and the carbon source may be mixed wet or dry.
- the silicon source and the carbon source may be mixed using, for example, a ball mill, an attention mill, a 3 roll mill, or the like.
- the mixed powder can be recovered, for example, using a sieve.
- the heat treatment of the mixed powder may be divided into a carbonization process and a synthesis process.
- the carbonization process is performed, for example, under the conditions of 600 ° C. to 1000 ° C.
- the synthesis process may be performed for a predetermined time (eg, 3 hours) under the conditions of 1300 ° C. to 1700 ° C., for example.
- the process of preparing the ⁇ -phase silicon carbide powder described above is merely an example, and the ⁇ -phase silicon carbide powder may be manufactured according to various methods.
- the silicon carbide powder of ⁇ phase is added to the silicon carbide powder of ⁇ phase as a seed (S110), and then heat-treated to form a silicon carbide powder of granules (S120).
- the heat treatment may be performed at a high temperature of 2000 ° C. or higher (eg, 2000 ° C. to 2200 ° C.).
- a high temperature of 2000 ° C. or higher (eg, 2000 ° C. to 2200 ° C.).
- evaporation-condensation may occur due to the high vapor pressure difference between silicon carbide of ⁇ phase and silicon carbide of ⁇ phase, and particles may grow rapidly by recrystallization.
- the silicon carbide phase transition of the ⁇ phase silicon carbide there is a section in which the ⁇ carbide silicon phase and the ⁇ phase silicon carbide are mixed. In order to obtain only the ⁇ phase silicon carbide, the heat treatment can be maintained for 4 hours or more.
- the silicon carbide powder of ⁇ phase added as a seed plays a role of nucleation. That is, silicon carbide on ⁇ evaporates at a high temperature and condenses on the surface of the silicon carbide powder on ⁇ added as a seed.
- the size of the particles of silicon carbide powder formed may vary. For example, the larger the amount of the silicon carbide powder on ⁇ added to the seed, the smaller the size of the formed particles. Therefore, the amount of the silicon carbide powder in the ⁇ phase added to the seed can be adjusted according to the desired particle size.
- the first group includes an alpha phase silicon carbide powder having a particle size (D50) of greater than 0 ⁇ m and less than or equal to 45 ⁇ m, and an agent comprising an alpha phase silicon carbide powder having a particle size of more than 45 ⁇ m and less than 75 ⁇ m.
- Silicon carbide powder comprising at least one group selected from two groups and a third group containing alpha-phase silicon carbide powder having a particle size larger than 75 ⁇ m and not larger than 110 ⁇ m can be obtained.
- the particle size can be adjusted without the grinding process, it is possible to obtain an alpha phase silicon carbide powder having impurities of 10 ppm or less (purity of 99.999%).
- the impurity may mean oxygen or nitrogen contained in the alpha phase silicon carbide powder.
- ⁇ -phase silicon carbide powder having an average particle size of 1.7 ⁇ m was placed in a graphite crucible, raised to 1450 ° C. in a vacuum atmosphere, raised to 2150 ° C. in an argon atmosphere, maintained for 1 hour, and naturally cooled.
- ⁇ -phase silicon carbide powder having an average particle size of 1.7 ⁇ m was placed in a graphite crucible, raised to 1450 ° C. in a vacuum atmosphere, raised to 2150 ° C. in an argon atmosphere, maintained for 3 hours, and naturally cooled.
- ⁇ -phase silicon carbide powder having an average particle size of 1.7 ⁇ m was placed in a graphite crucible, raised to 1450 ° C. in a vacuum atmosphere, raised to 2150 ° C. in an argon atmosphere, maintained for 5 hours, and naturally cooled.
- FIG. 2 shows the results of Comparative Example 1
- FIG. 3 shows the results of Comparative Example 2
- FIG. 4 shows the results of Comparative Example 3
- FIG. 5 is a graph showing the particle size distribution according to Comparative Example 3.
- ⁇ -phase silicon carbide powder 1wt% was added to ⁇ -phase silicon carbide powder having an average particle size of 1.7 ⁇ m and placed in a graphite crucible, which was heated up to 1450 ° C. in a vacuum atmosphere, raised to 2150 ° C. in an argon atmosphere, and maintained for 5 hours. And naturally cooled.
- 3wt% of ⁇ -phase silicon carbide powder was added to ⁇ -phase silicon carbide powder having an average particle size of 1.7 ⁇ m, placed in a graphite crucible, heated to 1450 ° C. in a vacuum atmosphere, and raised to 2150 ° C. in an argon atmosphere, and then maintained for 5 hours. And naturally cooled.
- ⁇ -phase silicon carbide powder 5wt% was added to ⁇ -phase silicon carbide powder having an average particle size of 1.7 ⁇ m, placed in a graphite crucible, heated to 1450 ° C. in a vacuum atmosphere, raised to 2150 ° C. in an argon atmosphere, and maintained for 5 hours. And naturally cooled.
- ⁇ -phase silicon carbide powder 7 wt% of ⁇ -phase silicon carbide powder was added to ⁇ -phase silicon carbide powder having an average particle size of 1.7 ⁇ m, put in a graphite crucible, and heated to 1450 ° C. in a vacuum atmosphere, and raised to 2150 ° C. in an argon atmosphere, and then maintained for 5 hours. And naturally cooled.
- FIG. 6 shows the results of Example 1
- FIG. 7 shows the results of Example 2
- FIG. 8 shows the results of Example 3
- FIG. 9 shows the results of Example 4.
- FIG. 10 is a graph showing a particle size distribution of Example 1
- FIG. 11 is a graph showing a particle size distribution of Example 2
- FIG. 12 is a graph showing a particle size distribution of Example 3
- FIG. 13 is a fourth example It is a graph showing the particle size distribution of.
- the ratio of the powder having a particle size of 45 ⁇ m to 75 ⁇ m in the final powder was the highest.
- the proportion of the powder having a particle size of 45 ⁇ m or less in the final powder was the highest. This is because the grain size decreases as the size of the seed used for nucleation increases.
- the high purity ⁇ -phase silicon carbide powder may be heat-treated at a high temperature to obtain high purity ⁇ -phase silicon carbide powder.
- the quality of the alpha phase silicon carbide powder obtained by lengthening the heat processing time can be improved.
- the particle size of the ⁇ -phase silicon carbide powder obtained can be adjusted using the amount of the seed added. Accordingly, the market demand for ⁇ -phase silicon carbide powder having various particle sizes can be satisfied, and since the grinding process is not performed to control the particle size, the purity of the material can be increased.
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Abstract
Description
Seed 양(wt%) | 열처리 온도(℃) | 열처리 시간(시간) | 입도(D50) | 결정상 | |
비교예 1 | 0 | 2150 | 1 | - | β+α |
비교예 2 | 0 | 2150 | 3 | - | β+α |
비교예 3 | 0 | 2150 | 5 | 150㎛ | α |
실시예 1 | 1 | 2150 | 5 | 110㎛ | α |
실시예 2 | 3 | 2150 | 5 | 60㎛ | α |
실시예 3 | 5 | 2150 | 5 | 45㎛ | α |
실시예 4 | 7 | 2150 | 5 | 45㎛ | α |
Claims (2)
- 입도(D50)가 0㎛보다 크고 45㎛이하인 알파상의 탄화규소 분체를 포함하며, 불순물이 10ppm이하로 함유된 제1 그룹, 입도가 45㎛보다 크고 75㎛이하인 알파상의 탄화규소 분체를 포함하며, 불순물이 10ppm이하로 함유된 제2 그룹 및 입도가 75㎛보다 크고 110㎛이하인 알파상의 탄화규소 분체를 포함하며, 불순물이 10ppm이하로 함유된 제3 그룹으로부터 선택된 적어도 하나의 그룹을 포함하는 탄화규소 분말.
- 제1항에 있어서,상기 제1 그룹, 상기 제2 그룹 및 상기 제3 그룹은 알파상의 탄화규소 분체 제조 시에 첨가되는 시드의 양에 따라 구분되는 탄화규소 분말.
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CN201380054592.9A CN104755421A (zh) | 2012-10-18 | 2013-07-10 | 碳化硅粉末和其制备方法 |
US14/408,151 US9440859B2 (en) | 2012-10-18 | 2013-07-10 | Silicon carbide powder comprising alpha phase silicon carbide granules of trimodal particle size distribution and low impurities |
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KR1020120115736A KR102024190B1 (ko) | 2012-10-18 | 2012-10-18 | 탄화규소 분말의 제조 방법 |
KR10-2012-0115736 | 2012-10-18 |
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US10106423B2 (en) | 2015-09-14 | 2018-10-23 | Korea Institute Of Science And Technology | Method for preparing ultrahigh-purity silicon carbide powder |
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CN112725895B (zh) * | 2021-01-29 | 2022-09-30 | 北京利宝生科技有限公司 | 一种碳化硅单晶体的生长方法 |
CN114032607B (zh) * | 2021-11-02 | 2024-01-09 | 西北工业大学 | 一种采用碳化锆籽晶制备碳化锆晶须的方法 |
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US20150218005A1 (en) | 2015-08-06 |
KR20140049663A (ko) | 2014-04-28 |
CN104755421A (zh) | 2015-07-01 |
KR102024190B1 (ko) | 2019-09-23 |
US9440859B2 (en) | 2016-09-13 |
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