JPH0248463A - Production of light-transmitting spinel calcined compact - Google Patents
Production of light-transmitting spinel calcined compactInfo
- Publication number
- JPH0248463A JPH0248463A JP63198147A JP19814788A JPH0248463A JP H0248463 A JPH0248463 A JP H0248463A JP 63198147 A JP63198147 A JP 63198147A JP 19814788 A JP19814788 A JP 19814788A JP H0248463 A JPH0248463 A JP H0248463A
- Authority
- JP
- Japan
- Prior art keywords
- spinel
- light
- transmitting
- compact
- calcined
- 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.)
- Pending
Links
- 239000011029 spinel Substances 0.000 title claims abstract description 32
- 229910052596 spinel Inorganic materials 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 239000000843 powder Substances 0.000 claims abstract description 11
- 238000005245 sintering Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 13
- NROKBHXJSPEDAR-UHFFFAOYSA-M potassium fluoride Chemical compound [F-].[K+] NROKBHXJSPEDAR-UHFFFAOYSA-M 0.000 claims description 13
- 239000011698 potassium fluoride Substances 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 6
- 235000003270 potassium fluoride Nutrition 0.000 claims description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 3
- 239000001307 helium Substances 0.000 claims description 2
- 229910052734 helium Inorganic materials 0.000 claims description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 2
- 238000002834 transmittance Methods 0.000 abstract description 12
- 239000000463 material Substances 0.000 abstract description 10
- 229910052723 transition metal Inorganic materials 0.000 abstract description 2
- 239000011369 resultant mixture Substances 0.000 abstract 2
- 238000001354 calcination Methods 0.000 abstract 1
- 150000003624 transition metals Chemical class 0.000 abstract 1
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 description 14
- 239000011148 porous material Substances 0.000 description 9
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000009835 boiling Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000001272 pressureless sintering Methods 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 238000000280 densification Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 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〕
本発明は、透光性に優れた多結晶スピネル焼結体、特に
波長３〜５μｍの中赤外領域で使用する赤外透過窓材と
して好適な透光性スピネル焼結体の製造方法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to a polycrystalline spinel sintered body with excellent translucency, particularly as an infrared transmitting window material used in the mid-infrared region of wavelengths 3 to 5 μm. The present invention relates to a method for manufacturing a suitable translucent spinel sintered body.
スピネル（ＭｇＡｊ○）はマグネシアＣＭｇｏ）とアル
ミナ（Ａｊ Ｏ）とからなる酸化物で、結晶型が立方晶
であるため結晶粒界での散乱がおこり難く、高密度に緻
密化した場合良好な透光性が得られることが知られてい
る。Spinel (MgAj○) is an oxide consisting of magnesia (CMgo) and alumina (AjO), and because its crystal type is cubic, scattering at grain boundaries is difficult to occur, and when it is highly densified, it has good transparency. It is known that optical properties can be obtained.
通常、スピネル焼結体の透光性は可視領域の波長０．４
μｍ付近から急激に高くなり、赤外領域の波長３〜５μ
ｍ付近で最高となる。従って、スピネル焼結体は光学窓
のような透光性材料として、特に波長３〜５μｍの中赤
外領域で使用する赤外透過窓材として宥望視され、従来
から各種の方法によって製造が試みられている。Normally, the light transmittance of spinel sintered bodies is 0.4 wavelength in the visible region.
The wavelength increases rapidly from around μm, and the wavelength in the infrared region is 3 to 5 μm.
It reaches its maximum around m. Therefore, spinel sintered bodies are viewed as desirable as light-transmissive materials such as optical windows, especially as infrared-transmissive window materials used in the mid-infrared region with wavelengths of 3 to 5 μm, and have traditionally been manufactured using various methods. is being attempted.
例えば、特開昭４７−６０２８号公報に記載されている
ように、焼結助剤として弗化リチウム（ＬｉＦ）を添加
して真空中でホットプレスする方法がある。For example, as described in JP-A-47-6028, there is a method in which lithium fluoride (LiF) is added as a sintering aid and hot pressing is carried out in a vacuum.
焼結助剤としてはＬｉＦのほかに酸化カルシウム（Ｃ！
ａｏ）も有効であることが知られている。又、特開昭５
５−２７８３７号公報にはＭｇＯとＡｌ２Ｏ３の組成比
を等モルから僅かにＡｌＯ過剰とし、焼結助剤としてＬ
ｉＦを添加して常圧焼結する方法が、及び特開昭５９−
１２１１５８号公報にはアルフキシトを加水分解して得
られたスピネル微粉末にＬｉＦを添加して水素中で常圧
焼結する方法が記載されている。In addition to LiF, calcium oxide (C!
ao) is also known to be effective. Also, Japanese Patent Application Publication No. 5
5-27837, the composition ratio of MgO and Al2O3 is set to be equimolar to a slight excess of AlO, and L is used as a sintering aid.
A method of adding iF and performing atmospheric pressure sintering is disclosed in JP-A-59-
121158 describes a method in which LiF is added to spinel fine powder obtained by hydrolyzing alfuxite and sintered in hydrogen at normal pressure.
上記した従来の透光性スピネル焼結体の製造方法におい
ては、いずれも緻密化のため焼結助剤としてＬｉＦやＣ
ａＯ企添加し更にはＭｇ０−ＡＩＯの組成比を変化させ
るので第２相が出現しやすく、組織的不均一性により光
が散乱され、直線透過率が低下する欠点があった。In all of the above-mentioned conventional methods for manufacturing translucent spinel sintered bodies, LiF and C are used as sintering aids for densification.
Since aO is added and the composition ratio of Mg0-AIO is changed, a second phase tends to appear, and light is scattered due to structural non-uniformity, resulting in a decrease in in-line transmittance.
又、常圧焼結法による場合には不均一な粒成長により空
孔が残留しやすいため、透光性のレベルが低かった。そ
の点、ホットプレス法では空孔が残留しにくいが、高温
と高圧を要するため設備の大型化に加え強度的制約のた
めに通常用いているカーボンの型材を使用できず、大型
材の製造が嬉しい欠点があった。又、形状的にも円板状
のものは得られるが、異形品は歩留良く製造できない等
、生産性が悪いという問題があった。Furthermore, when using the pressureless sintering method, pores tend to remain due to non-uniform grain growth, resulting in a low level of light transmittance. On this point, the hot press method is less likely to leave pores, but requires high temperatures and pressures, which requires larger equipment and strength constraints, making it impossible to use the carbon molds normally used, making it difficult to manufacture large materials. There was a nice flaw. Further, although disc-like products can be obtained, there is a problem in that productivity is poor, such as irregularly shaped products cannot be manufactured with good yield.
このように従来の方法で製造された透光性スピネル焼結
体では、直線透過率が試料厚さｌ ｗｓで７５〜８０％
程度が最大であり、試料厚さ３ ｍｓ以上で使用される
赤外透過窓材とするためには更に直線透過率の向上が必
要であった。In this way, the translucent spinel sintered body produced by the conventional method has a linear transmittance of 75 to 80% at the sample thickness lws.
In order to create an infrared transmitting window material for use with sample thicknesses of 3 ms or more, it was necessary to further improve the in-line transmittance.
本発明はかかる従来の事情に鑑み、高密度で透光性のレ
ベルが高く、特にＨさ３朋以上の赤外透過窓材として好
適な直線透過率を有する透光性スピネル焼結体の製造方
法を提供することを目的とする。In view of such conventional circumstances, the present invention produces a translucent spinel sintered body having a high density and a high level of translucency, and particularly a translucent spinel sintered body having an in-line transmittance suitable as an infrared transmissive window material with an H value of 3 or more. The purpose is to provide a method.
上記目的を達成するため、本発明の透光性スピネル焼結
体の製造方法では、純度９９．９％以上及び比表面積（
ＢＥＴ値） １０ ｉ／ｇ以上のスピネル粉末に０．１
〜２．０重量％の弗化カリウムを添加混合し、成形した
後１５００〜１７００ Ｃの温度で焼結し、更に１５０
０〜１８００ ｔ？の温度及び５００◆伽以上の圧力で
ＨＩＰ処理することを特徴とする。In order to achieve the above object, the method for manufacturing a translucent spinel sintered body of the present invention has a purity of 99.9% or more and a specific surface area (
BET value) 0.1 for spinel powder of 10 i/g or more
~2.0% by weight of potassium fluoride is added and mixed, molded, sintered at a temperature of 1500~1700C, and further heated to 150% by weight.
0~1800t? It is characterized by HIP treatment at a temperature of 500◆ or more and a pressure of 500◆ or more.
本発明においては、焼結助剤として添加する弗化カリウ
ム（ＫＦ）は融点が８６０ Ｃであるため、その温度以
上では液相となって焼結は液相焼結となるので、常圧焼
結であっても助剤無添加の場合と比較して均一に粒成長
し、粒内空孔を生じにくい。In the present invention, potassium fluoride (KF) added as a sintering aid has a melting point of 860 C, so above that temperature it becomes a liquid phase and sintering becomes liquid phase sintering. Even if the particles are mixed, the grains grow more uniformly than when no auxiliary agent is added, and intragranular pores are less likely to occur.
この作用に限っては従来の融点８４２Ｃの弗化リチウム
（ＬｉＦ）も同様であるが、ＬｉＦは沸点が１６７６７
：”と高く、この温度以下で焼結した場合にＬｉＦが第
２相として残存し透光性を低下させる。又、ＬｉＦの沸
点を超える高温での焼結では粒成長のフントロールが難
しく、やはり残留空孔によって透光性が低下する恐れが
ある。This effect is similar to conventional lithium fluoride (LiF), which has a melting point of 842C, but LiF has a boiling point of 16,767C.
When sintered at a temperature below this temperature, LiF remains as a second phase and reduces translucency.Also, when sintering at a high temperature exceeding the boiling point of LiF, it is difficult to control grain growth. After all, there is a possibility that the remaining pores may reduce the light transmittance.
然るに、本発明で用いる弗化カリウム（ＫＦ）は沸点が
１５０５ ｔ：’であるため、１５００〜１７００ Ｃ
での常圧焼結によりＫＦを残留させることなく粒成長を
フントロールして、理論密度比９５％以上に緻密化する
ことが可能である。However, since potassium fluoride (KF) used in the present invention has a boiling point of 1505 t:', the boiling point is 1500 to 1700 C.
It is possible to control grain growth by pressureless sintering without leaving KF remaining, and to densify the material to a theoretical density ratio of 95% or more.
弗化カリウム（ＫＦ）の添加量は０．１〜２．０重量％
が好ましく、０．１重量％未満では上記した作用による
常圧焼結による緻密化が得られず、２．０重量％を超え
るとＫＦの充分な除去が困難になり、透光性の低下をき
たす為である。The amount of potassium fluoride (KF) added is 0.1 to 2.0% by weight.
If it is less than 0.1% by weight, densification by pressureless sintering due to the above-mentioned effect cannot be obtained, and if it exceeds 2.0% by weight, it becomes difficult to remove KF sufficiently, resulting in a decrease in translucency. It is for the purpose of
原料であるスピネル粉末は不純物吸収による透光性の低
下を防ぐために９９゜９％以上の純度のものを使用し、
特にＦｅ等の遷移金属元素の含有は好ましくない。又ス
ピネル粉末は一次粒子の粒径が約０．２μｍ以下、即ち
表面積がＢＥＴ値で１０ ｍ／ｇ以上であることが緻密
な焼結体を得るために必要である。このように高純度で
且つ微細なスピネル粉末としては、アルフキシトの加水
分解によるもの、或いは共沈法によるもの等が好適であ
る。The raw material, spinel powder, has a purity of 99.9% or higher to prevent a decrease in translucency due to absorption of impurities.
In particular, the inclusion of transition metal elements such as Fe is not preferred. In order to obtain a dense sintered body, the spinel powder must have a primary particle size of about 0.2 μm or less, that is, a surface area of 10 m/g or more in BET value. As such a highly pure and fine spinel powder, one produced by hydrolysis of alfuxite or one produced by a coprecipitation method is suitable.
スピネル粉末は焼結に際して成形するが、成形比重を２
．０以上とすることが好ましい。焼結は真空中か、又は
水素やヘリウム等の分子径の小さいガス雰囲気中で行な
う。窒素やアルゴン等の分子径の大きなガス雰囲気中で
焼結することにより、これらの分子が空孔内に取り込ま
れると、以後の高密度化を阻害するからである。又、焼
結時間は２〜１２時間が好ましい。Spinel powder is molded during sintering, but the molding specific gravity is
．． It is preferable to set it to 0 or more. Sintering is performed in a vacuum or in an atmosphere of a gas with a small molecular diameter, such as hydrogen or helium. This is because, if these molecules are taken into the pores by sintering in a gas atmosphere with large molecular diameters such as nitrogen or argon, the subsequent increase in density will be inhibited. Moreover, the sintering time is preferably 2 to 12 hours.
ＨＩＰ処理においては、１５００〜１８００ ｔｒの温
度及び５００１％４以上の圧力で焼結体が等方的に加圧
され、塑性変形や拡散機構により空孔の除去が促進され
、透光性が一層向上する。但し、ＨＩＰ処理前の焼結体
の理論密度比が９５％未満の場合には残留気孔の多くが
所謂解放気孔状態となり、この解放気孔内にＨＩＰ処理
で用いるアルゴン、窒素、酸素等のガスが侵入して、高
密度化が充分に進行しない恐れがあるので、焼結体は理
論密度比９５％以上に緻密化するのが好ましい。In the HIP process, the sintered body is isotropically pressed at a temperature of 1500 to 1800 tr and a pressure of 5001%4 or higher, which promotes the removal of pores through plastic deformation and a diffusion mechanism, further improving the translucency. improves. However, if the theoretical density ratio of the sintered body before HIP treatment is less than 95%, most of the remaining pores will be in the so-called open pore state, and gases such as argon, nitrogen, oxygen, etc. used in HIP treatment will be present in the open pores. Since there is a possibility that the sintered body may penetrate and the densification may not proceed sufficiently, it is preferable that the sintered body is densified to a theoretical density ratio of 95% or more.
かかる本発明方法により、試料厚さ３朋での直線透過率
が波長３〜５μｍの赤外光で最高７５％以上と従来にな
い極めて優れた直線透過率を宥し、赤外透過窓材として
好適なスピネル焼結体を得ることができる。By the method of the present invention, the in-line transmittance at a sample thickness of 3 mm is at most 75% or more for infrared light with a wavelength of 3 to 5 μm, which is unprecedented and extremely excellent in-line transmittance, and it can be used as an infrared-transmitting window material. A suitable spinel sintered body can be obtained.
実施例１
純度９９．９％、比表面積１４．６ ｒｒｊ／ｇ （Ｂ
Ｋ Ｔ値）の高純度スピネル粉末に弗化カリウム２０
．２重量％添加し、アルミナボールを用いて２４時時間
式混合した。乾燥後、篩分６０メツシユで整粒し、内径
５０謂の金型にて２ ｔｏｎ／ｅＢの圧力で加圧成形す
ることにより比重２．２の成形体な得た。この成形体を
水素炉中において１６００ ｔｌｌ”の温度で４時間常
圧焼結し、理論密度比９８％の焼結体を得た。更に、こ
の焼結体をＨＩＰ装置に入れ、Ａｒガスを用いて１７０
０ ｔｌｌ”の温度及び２０００ Ｐｃ９／ｌＩｎの圧
力で２時間ＨＩＰ処理した。Example 1 Purity 99.9%, specific surface area 14.6 rrj/g (B
Potassium fluoride 20% in high purity spinel powder (K T value)
．． 2% by weight was added and mixed for 24 hours using an alumina ball. After drying, the particles were sieved using a 60-mesh sieve and press-molded at a pressure of 2 ton/eB in a mold with an inner diameter of 50 to obtain a molded product with a specific gravity of 2.2. This compact was sintered under normal pressure in a hydrogen furnace at a temperature of 1600 tll for 4 hours to obtain a sintered compact with a theoretical density ratio of 98%.Furthermore, this sintered compact was placed in a HIP device and Ar gas was introduced. using 170
HIP treatment was performed for 2 hours at a temperature of 0 tll'' and a pressure of 2000 Pc9/lIn.
得られたスピネル焼結体を厚さ３朋に鏡面研磨加工した
後、赤外分光光度計で直線透過率を測定したところ、波
長３〜５μｍの赤外領域で最高ピーク値で″１５％以上
の良好な透光性を示した。After mirror polishing the obtained spinel sintered body to a thickness of 3 mm, the linear transmittance was measured with an infrared spectrophotometer, and the highest peak value in the infrared region of wavelength 3 to 5 μm was 15% or more. It showed good translucency.
実施例２
純度９９．９％、比表面積１９，４→’ｇ（ＢＥＴ値ン
の高純度スピネル粉末に弗化カリウムを１．０重量％添
加し、実施例１と同様に混合及び整粒した後、直径３０
謂のゴムモールドを用いて１．５ ｔｏｎ、Δ扁で静圧
成形することにより比重２．１の成形体を得た。Example 2 1.0% by weight of potassium fluoride was added to high purity spinel powder with a purity of 99.9% and a specific surface area of 19.4g (BET value), and the mixture was mixed and sized in the same manner as in Example 1. Back, diameter 30
A molded product with a specific gravity of 2.1 was obtained by static pressure molding using a so-called rubber mold at a pressure of 1.5 tons and a Δ flatness.
この成形体をＨｅ雰囲気中において１５５０ ｔ：’の
温度で１２時間常圧焼結し、理論密度比９７％の焼結体
３得た。更にこの焼結体をＨＩＰ装置に入れ、Ａｒガス
を用いて１６００ Ｃの温度及び２０００’％４の圧力
で２時間ＨＩＰ処理した。This compact was sintered under normal pressure in a He atmosphere at a temperature of 1550 t:' for 12 hours to obtain a sintered compact 3 having a theoretical density ratio of 97%. Further, this sintered body was placed in a HIP apparatus and subjected to HIP treatment using Ar gas at a temperature of 1600 C and a pressure of 2000'%4 for 2 hours.
得られたスピネル焼結体を厚さ３ｆｉｌｌｌに鏡面研磨
加工した後、実施例１と同様に直線透過率を測定したと
ころ、波長３〜５μｍの赤外領域で最高ピーク値で７８
％以上の良好な透光性を示した。After mirror polishing the obtained spinel sintered body to a thickness of 3 fill, the linear transmittance was measured in the same manner as in Example 1, and the highest peak value was 78 in the infrared region with a wavelength of 3 to 5 μm.
% or more.
本発明によれば、焼結助剤として弗化カリウム？用いた
常圧焼結により高密度に焼結した後、更にＨＩＰ処理す
ることにより、高密度であって赤外領域での透光性に優
れた透光性スピネル焼結体を得ることができる。この透
光性スピネル焼結体は３朋以上の厚さでも透光性に優れ
、肉厚で使用される赤外透過窓材として特に有用である
。According to the invention, potassium fluoride as a sintering aid? After sintering to a high density using pressureless sintering, a translucent spinel sintered body with high density and excellent translucency in the infrared region can be obtained by further performing HIP treatment. . This light-transmitting spinel sintered body has excellent light-transmitting properties even when the thickness is 3 mm or more, and is particularly useful as an infrared-transmitting window material used in thick walls.
Claims (2)
０ｍ＾２／ｇ以上のスピネル粉末に０．１〜２．０重量
％の弗化カリウムを添加混合し、成形した後１５００〜
１７００℃の温度で焼結し、更に１５００〜１８００℃
の温度及び５００ｋｇ／ｃｍ＾２以上の圧力でＨＩＰ処
理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。(1) Purity 99.9% or more and specific surface area (BET value) 1
After adding and mixing 0.1 to 2.0% by weight of potassium fluoride to spinel powder of 0m^2/g or more and molding it,
Sintered at a temperature of 1700℃ and further sintered at a temperature of 1500-1800℃
1. A method for producing a translucent spinel sintered body, the method comprising HIPing at a temperature of 500 kg/cm^2 or more and a pressure of 500 kg/cm^2 or more.
ムガスの常圧雰囲気中で行なうことを特徴とする、請求
項（１）記載の透光性スピネル焼結体の製造方法。(2) The method for producing a translucent spinel sintered body according to claim (1), wherein the sintering is performed in a vacuum or in a normal pressure atmosphere of hydrogen gas or helium gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63198147A JPH0248463A (en) | 1988-08-09 | 1988-08-09 | Production of light-transmitting spinel calcined compact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63198147A JPH0248463A (en) | 1988-08-09 | 1988-08-09 | Production of light-transmitting spinel calcined compact |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0248463A true JPH0248463A (en) | 1990-02-19 |
Family
ID=16386243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63198147A Pending JPH0248463A (en) | 1988-08-09 | 1988-08-09 | Production of light-transmitting spinel calcined compact |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0248463A (en) |
-
1988
- 1988-08-09 JP JP63198147A patent/JPH0248463A/en active Pending
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