KR980009490A - High Strength Hydrogen Nitride-Boron Based Composite Sintered Body and Manufacturing Method Thereof - Google Patents
High Strength Hydrogen Nitride-Boron Based Composite Sintered Body and Manufacturing Method Thereof Download PDFInfo
- Publication number
- KR980009490A KR980009490A KR1019960031006A KR19960031006A KR980009490A KR 980009490 A KR980009490 A KR 980009490A KR 1019960031006 A KR1019960031006 A KR 1019960031006A KR 19960031006 A KR19960031006 A KR 19960031006A KR 980009490 A KR980009490 A KR 980009490A
- Authority
- KR
- South Korea
- Prior art keywords
- sintered body
- weight
- parts
- mixture
- manufacturing
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—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
- C04B35/58—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 borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
- C04B35/584—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 borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon nitride
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Ceramic Products (AREA)
Abstract
본 발명은 사이알론기(SIALON基)의 복합소결체에 관한 것으로, 특히 용강(熔鋼)을 주조하는 연속 주조설비에서 용강의 흐름을지지 및 안내하는 브레이크링(Brakering), 터빈브레이드와 같은 부분에 대한 우수한 내마모성, 고내열 충격성, 내침 식성을 갖는데 사용되는 소결체 및 그 제조에 관한 것으로, Si₃N₄ 55∼75중량부, 질화붕소 20∼40중량부, Al₂O₃와 Y₂O₃를 1:1중량비로 혼합된 혼합물이 4∼6중량부 조성되는 소결체로 구성되고, 그 제조방법으로서는 상기와 같이 조성된 혼합물을 성형한 후, 가압질소분위기하에서 1800∼1900℃온도로 질화반응 처리하여서된 기술로 이루어진다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite sintered body of a sialon group (SIALON group), and particularly to a continuous casting facility for casting molten steel, such as a braking for supporting and guiding the flow of molten steel, A mixture of 55 to 75 parts by weight of Si 3 N 4, 20 to 40 parts by weight of boron nitride, and a mixed mixture of Al 2 O 3 and Y 2 O 3 in a weight ratio of 1: 1, is used as the sintered body. The sintered body has excellent abrasion resistance, high thermal shock resistance, And 4 to 6 parts by weight of a sintered body. The manufacturing method is a method of forming a mixture as described above and nitriding the mixture at a temperature of 1800 to 1900 占 폚 under a pressurized nitrogen atmosphere.
Description
[발명의 명칭][Title of the Invention]
고강도 질화규소-질화붕소계 복합소결체 및 그 제조방법High-strength silicon nitride-boron nitride composite sintered body and manufacturing method thereof
[발명의 상세한 설명]DETAILED DESCRIPTION OF THE INVENTION [
(1) 발명이 속하는 기술분야 및 그 분야의 종래기술(1) Description of the Prior Art
본 발명은 사이알론기(SIALON基)의 복합 소결체에 관한 것으로, 보다 상세하게는 용강(熔鋼)을 주조하는 연속 주조설비에서 용강의 흐름을 지지 및 안내하는 브레이크링(Brake ring), 터빈브레이드와 같은 부분에 대해 우수한 내마모성, 고내열 충격성 등을 갖는데 사용되는 소결체 및 그 제조방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite sintered body of a sialon group, and more particularly, to a sintered body of a sintered body of a sintered body, such as a brake ring, which supports and guides the flow of molten steel in a continuous casting facility for casting molten steel, And a high thermal shock resistance, and a method for producing the sintered body.
일반적으로, 용강의 연속 주조 법에서는 턴디쉬(tundish) 하부로부터 주편을 인발하여 주조하는데, 턴디쉬와 모올드(mold)와의 접속 부위에는 턴디쉬 하부에는 후론트 노즐이, 후론트 노즐과 모올드(mold)와의 접속 부위에는 턴디쉬 하부에는 후론트 노즐이, 후론트 노즐과 모올드 사이에는 파이드 노즐이 설치되며, 피이드 노즐과 모올드와의 접속 부에는 브레이크링이 끼워져 있는 구조로 되어 있다.Generally, in the continuous casting method of molten steel, casting is performed from the bottom of a tundish to cast the casting. In the connecting portion between the tundish and the mold, a fronting nozzle is provided at the lower portion of the tundish, A fountain nozzle is provided at the bottom of the tundish, a fount nozzle is provided between the front nozzle and the oven, and a brake ring is fitted to the connection portion between the feed nozzle and the oven.
브레이크링은 모올드 내에서 주편의 응고셀(shell) 형성을 촉진시키기 위하여 설치되어 있는 것으로서, 모올드와의 접한 면측은 모올드의 냉각에 따라 저온으로 유지되는 한편, 용강과의 접촉면은 고온으로 되는 등 내부의 온도구배에 따라 열응력과 열충격을 받으며 용강의 흐름에도 노출과 연속적인 캐스트 스트랜드의 충격을 받는 등 극히 가혹한 작업 환경에 놓이게 된다.The brake ring is provided to promote the formation of a solidifying shell in the mold. The contact surface of the brake ring is maintained at a low temperature in accordance with the cooling of the mold, while the contact surface with the molten steel is maintained at a high temperature And under the influence of thermal stress and thermal shock due to the internal temperature gradient, it is exposed to the flow of molten steel and subjected to continuous cast strand impact.
따라서, 브레이크링 재질은 내열충격성, 내침식성, 내마모성 등이 우수하여야 하며 모올드에 정교하게 부착하기 위하여 정밀가공성이 요구된다.Therefore, the brake ring material should be excellent in heat shock resistance, erosion resistance, abrasion resistance, etc., and precise workability is required for precisely attaching to the mold.
기존의 브레이크링 소재로서는 알루미나질제나 지르코니아질제의 것이 있으나 이는 열응력을 일으키기 쉽고, 석영제의 브레이크링은 내열충격 저항은 좋으나 표면이 글라스상으로 용융되는 결점이 있다.Conventional brake ring materials include alumina zirconia and zirconia zirconia, but they tend to cause thermal stress, and quartz brake rings have a drawback in that they have good heat resistance and impact resistance, but their surfaces are melted in glass form.
또한 BN계 복합체가 여러 가지 개발되어 있으며 대표적인 예로서는 SiC/BN, TiB₂/BN, Si₃N₄/BN, AiN/BN, ZrO/BN, Al₂O₃/BN 등이 있으며, 물리적 성질 즉, 마찰계수, 내열충격성 및 열전도성 등의 고온특성을 향상시키고 있다.In addition, various BN-based composites have been developed. Typical examples are SiC / BN, TiB2 / BN, Si3N4 / BN, AiN / BN, ZrO / BN, and Al2O3 / BN. Physical properties such as friction coefficient, Thereby improving the high-temperature characteristics such as conductivity.
이중 일본국 공개특허공보 (소) 56-120575호에 Si₃N₄/BN, 복합소결재가 알려지고 있으나, 질화규소에 질화붕소만을 분산상으로 배합한 복합소결재의 소결성은 분산상이 증가할수록 크게 떨어지며 이에 따른 제품의 특성이 또한 크게 열화 된다.Although Si3N4 / BN and sintering agent are known in Japanese Laid-Open Patent Publication (Kokoku) No. 56-120575, the sinterability of the composite sintered material containing only boron nitride in a dispersed phase in silicon nitride is greatly decreased as the dispersed phase increases. The characteristics of the semiconductor device also deteriorate greatly.
한편 본 발명자는 상기한 문제점을 개선하기 위해 출원번호96-2766호(이하 '선발명'이라함)로 국내특허출원 한바 있다.Meanwhile, the inventor of the present invention filed a domestic patent application with application No. 96-2766 (hereinafter referred to as a "selection name") in order to solve the above problems.
복합재료의 성능과 가격은 이들의 소결방법에 따라 크게 달라진다.The performance and cost of composites vary greatly depending on their sintering method.
종전의 방법은 주로 상압소결(Pressureless Sintering) 혹은 고온가압성형(Hot press)법으로 제조하고 있으나 제품의 물리적 성질 및 형상의 제약이 있으며, 특히 복잡형상이나 대형제품의 제조는 불가능하다.The conventional method is mainly manufactured by pressureless sintering or hot press molding, but the physical properties and shape of the product are limited, and it is impossible to manufacture complex shapes or large products.
상압소결에서는 복합체 제조시 고밀도 제품을 얻을 수가 없음에 따라 내마모성이 급격하게 떨어지며, 쇳물에 대한 내침식성 및 내산화성이 크게 저하된다.In the pressureless sintering, since the high density product can not be obtained in the production of the composite, abrasion resistance is drastically decreased, and the erosion resistance and oxidation resistance of the sludge are greatly deteriorated.
반면에 고온가압성형법은 소결밀도를 높이는 것은 가능하지만 대형 제품이나 복잡하고 정밀한 제품은 제조가 불가능하다.On the other hand, the hot press forming method can increase the sintering density, but it is impossible to manufacture large products or complex and precise products.
[발명이 이루고자하는 기술적 과제][Technical Problem]
본 발명은 상기한 선발명과 사용 용도는 유사하나 제품의 조성이나 그 제조방법을 달리함과 함께 상기한 종래의 문제점을 해결하기 위해 안출한 것으로, 가압질소분위기하에서 소결함에 따라 적은 량의 소결조제를 첨가하고도 소결성의 향상을 얻을 수 있고, 또한 BN의 함량이 증가해도 일정한 강도를 갖는 합금을 얻는데 그 목적이 있다.The present invention has been accomplished in order to solve the above-described problems of the prior art and to provide a method of manufacturing a sintering auxiliary agent, And an object of obtaining an alloy having a constant strength even when the content of BN is increased.
[발명의 구성 및 작용][Structure and operation of the invention]
이와 같은 목적 달성을 위한 본 발명은 Si₃N₄가 45∼75중량부, BN가 20∼50중량부, Al2O3와 Y2O3를 1:1 1∼1.5중량 비로 혼합한 혼합물이 4∼6중량부로 조성된 복합소결체로 이루어진다.The present invention for achieving the object of the Si₃N₄ is 45-75 parts by weight, BN is 20 to 50 parts by weight, Al 2 O 3 and Y 2 O 3 to 1: 1 weight ratio mixture of 1~1.5 4-6 Based on the total weight of the sintered body.
또한 본 발명은 상기와 같이 조성된 복합물을 성형한 후 가압질소분위기하에서 1800∼1900℃온도로 질화반응 처리하는 방법으로 이루어진다.Further, the present invention comprises a method of forming a composite material as described above and subjecting it to a nitriding reaction at a temperature of 1800 to 1900 ° C under a pressurized nitrogen atmosphere.
Si3N4-BN계 합금에 소결조제로 Al2O3와 Y2O3를 함께 첨가하면 Al2O3와 Y2O3가 결합하여 결정 질이 입계면상에 생성되므로 해서 고온강도, 내크리프성, 열전도도 및 내산화도가 향상되는 것은 알려져 있으나,본 발명은 상기와 같이 Si3N4와 BN을 그리고 Al2O3와 Y2O3를 혼합함으로써 고온 물성의 향상을 얻기 위하는데 있다.Si 3 N 4 -BN to so based alloy if the addition of Al 2 O 3 and Y 2 O 3 with a sintering aid in the Al 2 O 3 and Y 2 O 3 are combined to produce the crystalline grain boundaries in the high-temperature strength, It is known that the creep resistance, thermal conductivity and oxidation resistance are improved. However, the present invention is not limited to the above-mentioned examples in which Si 3 N 4 and BN are mixed and Al 2 O 3 and Y 2 O 3 are mixed to obtain high- .
이때 소결조제가 4중량부 이하일 경우는 소결조제로서의 첨가효과를 기대할 수 없으며 6중량부 이상일때는 고온물성의 향상을 기대할 수 없다.At this time, when the sintering aid is 4 parts by weight or less, the effect of addition as a sintering aid can not be expected. When the amount is 6 parts by weight or more, improvement of high temperature properties can not be expected.
뿐만 아니라 기존의 SIALON-BN계 복합소결체의 경우는 BN함량이 20중량부 넘으면 소결성이 현격 떨어지는데 반해, 본 발명은 가압질소분위기하에서 소결하므로 BN함량을 20중량부 이상 첨가하여도 이론 밀도의 70%이상의 소결체를 얻을 수가 있었으며, 또한 소결조제의 량을 거의 반 정도로 감소시킴에 따라 고온물성의 감소를 가져오는 제2차상의 형성이 억제되어 고온에서의 강도 및 수명에 현격한 향상을 가져올 수 있었다.In addition, in the case of the conventional SIALON-BN composite sintered body, when the BN content is more than 20 parts by weight, the sinterability is significantly lowered, whereas the present invention is sintered under a pressurized nitrogen atmosphere. Sintered body can be obtained. Further, since the amount of the sintering assistant agent is reduced to about half, the formation of the secondary phase, which leads to a decrease in physical properties at high temperature, is suppressed, and the strength and life at high temperature can be remarkably improved.
다음은 실시예에 따라 설명한다.The following description will be made with reference to examples.
[실시예 1][Example 1]
질화규소 량을 60∼65중량부, 질화붕소 량을 30중량부로 조합한 화합물에 소결조제로 Al2O3와 Y2O3를 혼합비를 (표 1)와 같이 각각 달리하여 혼합한 후, 건조하고 CIP성형을 통해 시편을 제작하여 1800℃에서 가압소결한 제품의 특성을 기존 제품과 비교한 결과 (표 1)에 나타내었다.60 to 65 parts by weight of silicon nitride, and 30 parts by weight of boron nitride was mixed with Al 2 O 3 and Y 2 O 3 as sintering auxiliary agents in different mixing ratios as shown in Table 1, followed by drying The properties of the specimens produced by CIP molding and pressure sintering at 1800 ℃ were compared with those of existing products (Table 1).
[표 1][Table 1]
※ BN 함량 30 중량% 기준※ Based on BN content 30 wt%
실시예 2Example 2
실시예 1과 동일한 방법으로 성형된 시편들을 BN 함량 각각 20, 30, 40중량%에 대해 1700℃에서 1900℃에 걸쳐 질소분위기하에서 가압소결합 제품의 각 소성온도별 불성치를 (표 2)에 나타내었다.The specimens molded in the same manner as in Example 1 were tested for the respective BN contents of 20, 30 and 40% by weight, respectively, at 1700 ° C to 1900 ° C in a nitrogen atmosphere, .
[표 2][Table 2]
[발명의 효과][Effects of the Invention]
본 발명은 Si₃N₄-BN계 합금에서 BN함량을 높여도 이론 밀도의 70%이상의 소결체를 얻을 수 있어 소결 특성이 우수함과 함께 소결조제의 량을 감소시킴에 따라 고온물성의 감소를 가져오는 제2차상의 형성이 억제되어 고온에서의 강도 및 수명에 현격한 향상을 가져올 수 있다.The present invention can provide a sintered body having more than 70% of the theoretical density even when the BN content in the Si 3 N 4 -BN based alloy is increased, and the sintering property is excellent. In addition, Can be suppressed and the strength and life at high temperature can be remarkably improved.
따라서 연속 주조설비에서의 용강의 흐름을지지 및 안내하는 브레이크링을 비롯한 터빈브레이드와 같은 부분에 대한 우수한 내마모성, 고내열충격성, 내침투 등을 갖게 할 수 있다.Therefore, it is possible to provide excellent abrasion resistance, high thermal shock resistance, penetration resistance, etc. for a portion such as a turbine blade including a brake ring for supporting and guiding the flow of molten steel in a continuous casting facility.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019960031006A KR100191282B1 (en) | 1996-07-29 | 1996-07-29 | METHOD FOR MANUFACTURING SiN-BN COMPOSITE SINTERING MATERIAL AND THE SAME PRODUCT |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019960031006A KR100191282B1 (en) | 1996-07-29 | 1996-07-29 | METHOD FOR MANUFACTURING SiN-BN COMPOSITE SINTERING MATERIAL AND THE SAME PRODUCT |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR980009490A true KR980009490A (en) | 1998-04-30 |
| KR100191282B1 KR100191282B1 (en) | 1999-06-15 |
Family
ID=19467908
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019960031006A KR100191282B1 (en) | 1996-07-29 | 1996-07-29 | METHOD FOR MANUFACTURING SiN-BN COMPOSITE SINTERING MATERIAL AND THE SAME PRODUCT |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR100191282B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7758962B2 (en) | 2004-09-10 | 2010-07-20 | Nissin Kogyo Co., Ltd. | Composite metal material and method of producing the same, caliper body, bracket, disk rotor, drum, and knuckle |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101047911B1 (en) * | 2008-06-12 | 2011-07-08 | 임광현 | Silicon nitride ceramic composite material for temperature sensor protection tube for temperature measurement of molten steel and protection tube for temperature sensor using the same |
-
1996
- 1996-07-29 KR KR1019960031006A patent/KR100191282B1/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7758962B2 (en) | 2004-09-10 | 2010-07-20 | Nissin Kogyo Co., Ltd. | Composite metal material and method of producing the same, caliper body, bracket, disk rotor, drum, and knuckle |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100191282B1 (en) | 1999-06-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4885264A (en) | Pressure-sintered polycpystalline mixed materials with a base of hexagonal boron nitride, oxides and carbides | |
| EP0107349B1 (en) | Manufacturing method for fiber reinforced silicon ceramics sintered body | |
| Lu et al. | The mechanical properties of co-continuous Si3N4/Al composites manufactured by squeeze casting | |
| Zhang et al. | In situ reaction synthesis of silicon carbide–boron nitride composites | |
| US4777155A (en) | Sintered member of aluminum nitride base reinforced composite material | |
| US5464583A (en) | Method for manufacturing whisker preforms and composites | |
| KR980009490A (en) | High Strength Hydrogen Nitride-Boron Based Composite Sintered Body and Manufacturing Method Thereof | |
| Komeya et al. | High-strength silicon nitride ceramics obtained by grain-boundary crystallization | |
| CN104446513A (en) | Composite sintering aids for BN-ZrO2-SiC composite material | |
| EP0331460B1 (en) | Fiber-reinforced ceramic green body | |
| Briggs | Pressureless sintering of sialon ceramics | |
| JPS5950074A (en) | Continuous casting refractories | |
| JPH085720B2 (en) | Whisker-reinforced composite sintered body | |
| EP0396779A1 (en) | Boron nitride ceramic having excellent resistance against fusing damage | |
| Zhang et al. | Liquid-phase hot-pressing and WC-particle reinforcement of SiC-Si composites | |
| US5134098A (en) | Method of producing mullite/yttria stabilized zirconia/boron nitride composites | |
| JPS5957964A (en) | Manufacture of fiber reinforced silicon nitride sintered bo-dy | |
| JP2820710B2 (en) | Break ring for horizontal continuous casting | |
| Kitaoka et al. | Fabrication of Continuous‐SiC‐Fiber‐Reinforced SiAlON‐Based Ceramic Composites by Reactive Melt Infiltration | |
| KR950001672B1 (en) | Process for the preparation of siliconoxynitride using break ring | |
| JPH07315937A (en) | Normal pressure sintered compact of boron nitride and its production | |
| SU1139719A1 (en) | High-temperature ceramic material | |
| RU2243955C2 (en) | Composite | |
| JP2706302B2 (en) | Method for producing high-density silicon nitride sintered body | |
| JPH04342468A (en) | Refractory for continuous casting and its production |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| E902 | Notification of reason for refusal | ||
| E701 | Decision to grant or registration of patent right | ||
| GRNT | Written decision to grant | ||
| LAPS | Lapse due to unpaid annual fee |