JPH01230465A - Light-transmitting spinel sintered material and production thereof - Google Patents
Light-transmitting spinel sintered material and production thereofInfo
- Publication number
- JPH01230465A JPH01230465A JP63055844A JP5584488A JPH01230465A JP H01230465 A JPH01230465 A JP H01230465A JP 63055844 A JP63055844 A JP 63055844A JP 5584488 A JP5584488 A JP 5584488A JP H01230465 A JPH01230465 A JP H01230465A
- Authority
- JP
- Japan
- Prior art keywords
- spinel
- density
- sintered body
- sintered material
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910052596 spinel Inorganic materials 0.000 title claims abstract description 30
- 239000011029 spinel Substances 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 239000000463 material Substances 0.000 title abstract description 9
- 239000000843 powder Substances 0.000 claims abstract description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 5
- 230000003068 static effect Effects 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 14
- 238000005245 sintering Methods 0.000 claims description 14
- 238000002834 transmittance Methods 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 239000011148 porous material Substances 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 238000001272 pressureless sintering Methods 0.000 description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- 150000004703 alkoxides Chemical class 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 238000000280 densification Methods 0.000 description 3
- 229910001882 dioxygen Inorganic materials 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011163 secondary particle Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 239000011882 ultra-fine particle Substances 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
この発明は透光性にすくれた多結晶スピネル焼結体およ
びその製造方法に係り、特に波長２〜４μｍの中赤外領
域での赤外光透過窓として好適な高密度のスピネル焼結
体およびその製造方法に関づるものである。[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a translucent polycrystalline spinel sintered body and a method for manufacturing the same, particularly in the mid-infrared region with a wavelength of 2 to 4 μm. The present invention relates to a high-density spinel sintered body suitable as an external light transmission window and a method for manufacturing the same.
〈従来の技術〉
スピネル（ｒ ＡＪ ２０／、 ）は結晶型が立方晶で
あるため、粒界散乱が起こりにくく、従来各種の製法に
よって透光性焼結体を得る試みがなされている。<Prior Art> Since spinel (r AJ 20/, ) has a cubic crystal type, grain boundary scattering is less likely to occur, and attempts have been made to obtain translucent sintered bodies by various manufacturing methods.
例えば“特開昭４７−６０２８号公報に示されるように
、弗化リチウム（ＬｉＦ）を添加して真空中でホットプ
レスする方法や、特開昭５９−１２１１５８号公報に示
されるようにアルコキシドを加水分解して得られた微粉
末にり、、「を添加して所定形状に成形したのち、水素
中において焼結する方法、さ、らに高純度−Ｎ ２０／
、原石とアルコキシド法にて臂だ超微粒子〃２０ｇとの
混合物を成形した後真空または水素雰囲気中で焼成する
方法（特開昭６２−７２５５６号）などが知られている
。この、いわゆる常圧焼結法（無加圧焼結法）では、焼
結助剤を添加することが必要であり、上記のり、Ｆのほ
かに酸化カルシウム（Ｃａｂ）も有効であることが知ら
れている。For example, as shown in JP-A-47-6028, lithium fluoride (LiF) is added and hot-pressed in a vacuum, or alkoxide is added as shown in JP-A-59-121158. There is a method in which the fine powder obtained by hydrolysis is added with N20/N20/
, a method is known in which a mixture of raw stone and 20 g of ultrafine particles prepared by the alkoxide method is formed and then fired in a vacuum or hydrogen atmosphere (Japanese Patent Application Laid-open No. 72556/1983). In this so-called pressureless sintering method (pressureless sintering method), it is necessary to add a sintering aid, and in addition to the above-mentioned glue and F, calcium oxide (Cab) is also known to be effective. It is being
また常圧焼結法においては、Ｍ２Ｏ３と１０の組成比が
モル比で０．５：０．５の等モル比の焼結体のほかに、
ＭｇＯ過剰あるいはＮ２Ｏ３が僅かに過剰の組成の焼結
体がある。In addition, in the pressureless sintering method, in addition to a sintered body in which the composition ratio of M2O3 and 10 is an equimolar ratio of 0.5:0.5,
There is a sintered body having a composition with an excess of MgO or a slight excess of N2O3.
〈発明が解決しようとする課題〉
従来の真空中におけるホットプレス方法は、高温、高圧
力を要づるため、設備が大型化し、生産性が悪く、高価
となる欠点がある。また、形状的にも円板状のものは得
られるが、異形品は歩留りよく作ることができないとい
う問題があった。<Problems to be Solved by the Invention> The conventional hot pressing method in a vacuum requires high temperature and high pressure, which has the drawbacks of large-sized equipment, poor productivity, and high cost. Further, although disc-shaped products can be obtained, there is a problem in that irregularly shaped products cannot be manufactured with a high yield.
また、常圧焼結法では空孔が残留しやすいため、透光性
のレベルが低く、焼結助剤を添加したり、モル比を変化
させた場合にも第２相が出現しやすく、これらの組織的
不均一性により光が散乱され、直線透過率が低ドすると
いう欠点があった。In addition, since pores tend to remain in the pressureless sintering method, the level of transparency is low, and a second phase tends to appear even when a sintering aid is added or the molar ratio is changed. These structural non-uniformities cause light to be scattered, resulting in a disadvantage of low in-line transmittance.
従来法にＪ、る透光性スピネル焼結体の直線透過率は厚
さ１ ｍｍで７５〜８０％程度であったが、赤外光透過
窓としては厚さ３ｍｍ以上で使用される用途もあり、透
光性の向−にが必要であった。The in-line transmittance of the translucent spinel sintered body used in the conventional method was about 75 to 80% at a thickness of 1 mm, but it is also used as an infrared light transmitting window at a thickness of 3 mm or more. There was a need for translucency.
く課題を解決するための手段〉
この発明は上記従来法の課題を解決するべく検問の結果
、いったん焼結した高密度スピネル焼結体を、さらに高
温高圧で熱間静水圧（ＨＩ Ｐ＞処理することにより、
さらに高密度化を促進し、厚肉材料でも透光性に１くれ
たスピネル焼結体を製造する方法を見出したのである。In order to solve the above-mentioned problems of the conventional method, the present invention has been developed to solve the above-mentioned problems of the conventional method. By doing so,
Furthermore, they discovered a method for producing spinel sintered bodies that promote higher density and have improved translucency even when using thick-walled materials.
即ち、この発明は純度９９．９％以上、比表面積１０Ｔ
Ｉｔ、７ｇ（ＢＥＴ値）以上の高純度で、かつ微細なス
ピネル粉末を圧力１．０ｔＯｎ、／ｃｍ２以上で静圧成
形し、成形比重を２．０以上の成形体としたのち、真空
または水素またはヘリウムの雰囲気中て１４００〜１８
００°Ｃの節回て２〜２４時間多段階焼結して理論密度
の９５％以上に高密度化し、次いでこの焼結体をさらに
１４００〜１８００°Ｃ１圧力５００〜２０００ＫＮ−
Ｊの高圧の窒素ガス、アルゴンガスまたは酸素ガスの雰
囲気下でＨＩＰ５１！￥理することによりさらに高密度
で透光性にづぐれた透光性スピネル焼結体を提供するも
のである。That is, this invention has a purity of 99.9% or more and a specific surface area of 10T.
It, 7 g (BET value) or more of high purity and fine spinel powder is statically molded at a pressure of 1.0 tOn/cm2 or more to form a compact with a molded specific gravity of 2.0 or more, and then vacuum or hydrogen or 1400-18 in helium atmosphere
Multi-stage sintering is performed at 00°C for 2 to 24 hours to increase the density to 95% or more of the theoretical density, and then this sintered body is further sintered at 1400 to 1800°C and 500 to 2000 KN-pressure.
HIP51! under a high-pressure nitrogen, argon, or oxygen gas atmosphere. By processing, a translucent spinel sintered body with higher density and improved translucency can be provided.
く作用〉
この発明において、ＨＩＰ処理は焼結により９５％以上
に高密度化したスピネル焼結体の表面を１４００〜１８
００°Ｃの高温下、５００〜２０００に９Ｊの高圧で等
方的に圧縮する方向に加圧づるため、塑性変形および拡
散機構による空孔の除去が促進され、さらに高密度化が
達成される。これが透光性の向上に有効に寄与するので
ある。ＨＩＰ処理前の密度が９５％未満の場合には残留
空孔の多くがいわゆる開気孔状態となって高圧ガスが焼
結体内部に侵入してしまうため、）−１１Ｐ処理による
高密度化が十分に進行しない。In this invention, the HIP treatment reduces the surface of the spinel sintered body, which has been densified to 95% or more by sintering, to a
Since the material is isotropically compressed at a high pressure of 500 to 2000°C and 9J at a high temperature of 00°C, the removal of pores by plastic deformation and diffusion mechanisms is promoted, and further densification is achieved. . This effectively contributes to improving translucency. If the density before HIP treatment is less than 95%, most of the remaining pores become so-called open pores, allowing high pressure gas to enter the inside of the sintered body. does not proceed.
ＨＩＰ処理にお（プる高圧ガスはスピネル焼結体に対し
て等方的に働くため、従来のホットプレス法による上下
方向のみの加圧よりも均一に高密度化が進行し、透光性
の均一な焼結体が得られる。Because the high-pressure gas applied to the HIP treatment acts isotropically on the spinel sintered body, densification progresses more uniformly than when pressurizing only in the vertical direction with the conventional hot press method, resulting in improved translucency. A uniform sintered body is obtained.
また焼結時に発生した不均一相も均一化づる効果がある
。It also has the effect of homogenizing the heterogeneous phase generated during sintering.
高圧ガスの圧力は５００〜２０００Ｋｆ１４と高圧であ
るため、従来のホットプレス法（１０００Ｋｇ／ｃｍ２
が限度）Ｊ：りも空孔の除去効果が大きく、すぐれた透
光性の焼結体が得られる。Since the pressure of high-pressure gas is as high as 500 to 2000Kf14, the conventional hot press method (1000Kg/cm2
J: The effect of removing pores is large, and a sintered body with excellent translucency can be obtained.
高圧ガスの種類はアルゴンガスまたは窒素ガスまたは酸
素ガスあるいはこれらの混合ガスが望ましく、若干の酸
素ガスを混合することにより、ＨＩＰ処理時のスピネル
焼結体からの脱酸素による透光性の低下を防止できる効
果を有する。The type of high-pressure gas is preferably argon gas, nitrogen gas, oxygen gas, or a mixture of these gases. By mixing a small amount of oxygen gas, a decrease in translucency due to deoxidation from the spinel sintered body during HIP processing can be prevented. It has the effect of preventing
高圧ガス投入前の焼結は多段階で行なわれるが、スピネ
ル成形体の焼結による高密度化過程において残留空孔の
内部に窒素、アルゴン等の分子径の大きなガスが取り込
まれることは以後の高密度化を阻害覆るので、この焼結
は真空雰囲気または分子径の小さな水素やヘリウム雰囲
気が望ましい。Sintering before high-pressure gas injection is performed in multiple stages, but gases with large molecular diameters such as nitrogen and argon are trapped inside the residual pores during the densification process of the spinel compact by sintering. This sintering is preferably performed in a vacuum atmosphere or in a hydrogen or helium atmosphere with small molecular diameters, since this may inhibit high density.
そして焼結条件としては１４００〜１８００°Ｃで２〜
２４時間が好ましく、第１段階の焼結で理論密度の９５
％以」二に高密度化される。And the sintering conditions are 1400~1800°C and 2 ~
24 hours is preferred, and the first stage of sintering reduces the theoretical density to 95%.
% or more.
またＣａＯまたはしＬＰなどの焼結助剤を添加した場合
には４〜１０時間程時間短時間保持でも９５％以上の高
密度焼結を容易に達成することができる。Furthermore, when a sintering aid such as CaO or LP is added, high-density sintering of 95% or more can be easily achieved even by holding for a short time of about 4 to 10 hours.
この発明において使用するスピネル粉末は純度９９．９
％以上で比表面積が１０ＴＩｔ＃］ （Ｂ Ｅ Ｔ値）
以上であることが望ましい。The spinel powder used in this invention has a purity of 99.9
% or more, the specific surface area is 10TIt#] (BET value)
The above is desirable.
これは−次粒子の粒径がおＪ、そ０．２μｍ以下である
ことを示しており、」二記の焼結条件で緻密な焼結体を
得るためには必要な条件である。また純度を９９，９％
以上とするのは、不純物が多く含有しているとたとえ十
分な高密度化焼結体が１ηられたとしても不純物吸収に
より透光性の低下をもたらすためである。This indicates that the particle size of the secondary particles is 0.2 μm or less, which is a necessary condition for obtaining a dense sintered body under the sintering conditions described in 2. Also, the purity is 99.9%
The reason for this is that if a large amount of impurities is contained, even if a sufficient densified sintered body is produced by 1η, the impurity absorption will result in a decrease in light transmittance.
特に鉄などの遷移金属元素を含むことは好ましくない。In particular, it is not preferable to include transition metal elements such as iron.
なお原料粉末としてはアルコキシド等の加水分解による
ものが適当である。Note that as the raw material powder, powder obtained by hydrolysis of alkoxide or the like is suitable.
上記したこの発明の製造方法によると、波長３〜４μｍ
の赤外光による厚さ３胴の直線透過率が７５％以上の透
光性スピネル焼結体を得ることができる。According to the manufacturing method of the present invention described above, the wavelength is 3 to 4 μm.
It is possible to obtain a translucent spinel sintered body having a linear transmittance of 75% or more with infrared light of 3 cylinder thickness.
〈実施例〉 以下、この発明を実施例により詳細に説明覆る。<Example> Hereinafter, this invention will be explained in detail with reference to Examples.
純度９９．９％、比表面積１４ＴＩｔ、／ｇ（Ｂ Ｅ
Ｔ値）の高純度スピネル粉末にしＦを０．２％添加し、
アルミナボールを用いて２４時時間式混合した。この混
合粉末を乾燥後、直径３０ｍｍのづムモールドを用いて
２．０ｔｏｎ４て静圧成形を行ない、比重２．２の成形
体を冑 プこ 。Purity 99.9%, specific surface area 14 TIt, /g (BE
High purity spinel powder with T value) is added with 0.2% F,
The mixture was mixed 24 hours a day using an alumina ball. After drying this mixed powder, it was subjected to static pressure molding at 2.0 tons using a drum mold with a diameter of 30 mm to form a molded product with a specific gravity of 2.2.
この成形体を水素炉中で１１００℃で３時間仮焼結した
後、１８００°Ｃで２４時間焼結し、理論密度比９８％
以上の焼結体を得た。さらにこの焼結体をＨＩＰ装置に
入れ、１０％０２− Ａｒの混合ガスを用いて２０００
ＫＳＩ−４で１時間保持した。This compact was pre-sintered at 1100°C for 3 hours in a hydrogen furnace, and then sintered at 1800°C for 24 hours, resulting in a theoretical density ratio of 98%.
The above sintered body was obtained. Further, this sintered body was placed in a HIP device and heated to 2000°C using a 10% O2-Ar mixed gas.
It was maintained in KSI-4 for 1 hour.
かくして得られたスピネル焼結体を厚さ３ｍｍに鏡面胡
麻加工し、赤外分光光度計で透過率を測定したところ、
波長３〜４μ班の赤外領域で最高８４％の良好な透光性
を示した。The thus obtained spinel sintered body was mirror-finished to a thickness of 3 mm, and its transmittance was measured using an infrared spectrophotometer.
It exhibited good translucency of up to 84% in the infrared region of wavelengths 3 to 4 microns.
〈発明の効果〉
以上説明したように、この発明によればスピネル成形体
をいったん高密度に焼結したのち、さらに高温高圧でＨ
ＩＰ処理を施すことにより、高密度で透光性にでぐれた
スピネル焼結体を得ることができるのである。<Effects of the Invention> As explained above, according to the present invention, after a spinel molded body is sintered to a high density, it is further heated at high temperature and high pressure.
By performing the IP treatment, a spinel sintered body with high density and excellent translucency can be obtained.
また、この発明により得られる透光性スピネル焼結体は
、透光性にすぐれているため、３ｍｍ以上の厚内で使用
される赤外光透過窓材として有用である。Further, the translucent spinel sintered body obtained by the present invention has excellent translucency and is therefore useful as an infrared light transmissive window material used within a thickness of 3 mm or more.
Claims (4)
〜４μｍの赤外光による３ｍｍ厚さの直線透過率が７５
％以上であることを特徴とする透光性スピネル焼結体。(1) Made of magnesia-alumina spinel, wavelength 3
Linear transmittance of 3mm thickness by ~4μm infrared light is 75
% or more.
粉末を成形後、焼結して高密度化したのち、１４００〜
１８００℃、５００Ｋｇ／ｃｍ＾２以上にて熱間静水圧
処理することによりさらに高密度で透光性にすぐれた焼
結体とすることを特徴とする透光性スピネル焼結体の製
造方法。(2) After molding high-purity and fine magnesia-alumina spinel powder and sintering it to high density,
A method for producing a translucent spinel sintered body, which comprises producing a sintered body with higher density and excellent translucency by subjecting it to hot isostatic pressure treatment at 1800° C. and 500 Kg/cm^2 or higher.
０ｍ＾２／ｇ以上であることを特徴とする請求項（２）
記載の透光性スピネル焼結体の製造方法。(3) Spinel powder has a purity of 99.9% or more and a specific surface area of 1
Claim (2) characterized in that it is 0 m^2/g or more.
The method for manufacturing the translucent spinel sintered body described above.
上の静圧成形で行ない、成形比重を２．０以上とするこ
とを特徴とする請求項（２）記載の透光性スピネル焼結
体の製造方法。(4) The translucent spinel sintered body according to claim (2), wherein the spinel powder is molded by static pressure molding at a pressure of 1 ton/cm^2 or more, and the molding specific gravity is 2.0 or more. manufacturing method.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63055844A JP2620288B2 (en) | 1988-03-09 | 1988-03-09 | Method for producing translucent spinel sintered body |
| EP89302254A EP0332393B1 (en) | 1988-03-09 | 1989-03-07 | Method of producing a light-transmitting spinel sintered body |
| DE68916282T DE68916282T2 (en) | 1988-03-09 | 1989-03-07 | Process for producing a translucent body from sintered spinel. |
| US07/579,085 US5152940A (en) | 1988-03-09 | 1990-09-07 | Method of producing a light-transmitting spinel sintered body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63055844A JP2620288B2 (en) | 1988-03-09 | 1988-03-09 | Method for producing translucent spinel sintered body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01230465A true JPH01230465A (en) | 1989-09-13 |
| JP2620288B2 JP2620288B2 (en) | 1997-06-11 |
Family
ID=13010326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63055844A Expired - Lifetime JP2620288B2 (en) | 1988-03-09 | 1988-03-09 | Method for producing translucent spinel sintered body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2620288B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006315878A (en) * | 2005-05-10 | 2006-11-24 | Sumitomo Electric Ind Ltd | Translucent ceramic and method for producing the same |
| WO2008108276A1 (en) * | 2007-03-02 | 2008-09-12 | Sumitomo Electric Industries, Ltd. | Spinel sintered body, method for producing the same, transparent substrate, and liquid crystal projector |
| WO2009069552A1 (en) * | 2007-11-26 | 2009-06-04 | Sumitomo Electric Industries, Ltd. | Transparent polycrystalline spinel substrate, process for producing the substrate, and optical article using the substrate |
| JP2009280455A (en) * | 2008-05-23 | 2009-12-03 | Sumitomo Electric Ind Ltd | Transparent polycrystal spinel substrate and method for producing the same, and electro-optical device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006273679A (en) | 2005-03-30 | 2006-10-12 | Sumitomo Electric Ind Ltd | Spinel sintered compact, light transmission window, and light transmission lens |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53106713A (en) * | 1977-03-01 | 1978-09-18 | Nippon Telegraph & Telephone | Process for making light permeable mgal204 ceramics |
| JPS59121158A (en) * | 1982-12-27 | 1984-07-13 | 日本碍子株式会社 | Polycrystal transparent spinel sintered body and manufacture |
-
1988
- 1988-03-09 JP JP63055844A patent/JP2620288B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53106713A (en) * | 1977-03-01 | 1978-09-18 | Nippon Telegraph & Telephone | Process for making light permeable mgal204 ceramics |
| JPS59121158A (en) * | 1982-12-27 | 1984-07-13 | 日本碍子株式会社 | Polycrystal transparent spinel sintered body and manufacture |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006315878A (en) * | 2005-05-10 | 2006-11-24 | Sumitomo Electric Ind Ltd | Translucent ceramic and method for producing the same |
| WO2008108276A1 (en) * | 2007-03-02 | 2008-09-12 | Sumitomo Electric Industries, Ltd. | Spinel sintered body, method for producing the same, transparent substrate, and liquid crystal projector |
| JP2008214123A (en) * | 2007-03-02 | 2008-09-18 | Sumitomo Electric Ind Ltd | Spinel sintered compact, method of manufacturing the same, transparent substrate and liquid crystal projector |
| WO2009069552A1 (en) * | 2007-11-26 | 2009-06-04 | Sumitomo Electric Industries, Ltd. | Transparent polycrystalline spinel substrate, process for producing the substrate, and optical article using the substrate |
| JP2009126749A (en) * | 2007-11-26 | 2009-06-11 | Sumitomo Electric Ind Ltd | Transparent polycrystal spinel substrate, method for producing the same, and optical product using the substrate |
| JP2009280455A (en) * | 2008-05-23 | 2009-12-03 | Sumitomo Electric Ind Ltd | Transparent polycrystal spinel substrate and method for producing the same, and electro-optical device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2620288B2 (en) | 1997-06-11 |
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| Date | Code | Title | Description |
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| EXPY | Cancellation because of completion of term |