JPH02283674A - Production of ceramics - Google Patents
Production of ceramicsInfo
- Publication number
- JPH02283674A JPH02283674A JP1106701A JP10670189A JPH02283674A JP H02283674 A JPH02283674 A JP H02283674A JP 1106701 A JP1106701 A JP 1106701A JP 10670189 A JP10670189 A JP 10670189A JP H02283674 A JPH02283674 A JP H02283674A
- Authority
- JP
- Japan
- Prior art keywords
- capsule
- sintering
- sintered body
- sintered
- protrusion
- 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
- 239000000919 ceramic Substances 0.000 title claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 239000002775 capsule Substances 0.000 claims abstract description 45
- 238000005245 sintering Methods 0.000 claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 239000007769 metal material Substances 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 3
- 238000003466 welding Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 5
- 238000000227 grinding Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 3
- 238000007514 turning Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000001513 hot isostatic pressing Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 208000031872 Body Remains Diseases 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は9例えばX線CT用のシンチレータ材料である
GdxOx S : Prのような熱間静水圧加圧(以
下HIPと記す)状態で焼結して得られるセラミックス
の製造方法に関するものであり、特にHIP時に使用し
たカプセルの除去を容易かつ円滑に行い得るように改良
したセラミックスの製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is directed to the use of GdxOx S:Pr, which is a scintillator material for X-ray CT, by sintering in a hot isostatic pressing (hereinafter referred to as HIP) state. The present invention relates to a method for manufacturing ceramics obtained by bonding the ceramics, and in particular to a method for manufacturing ceramics that has been improved so that the capsules used during HIP can be easily and smoothly removed.
従来セラミックスを製造する場合には、所定の成分とな
るように配合した原料粉末を1例えば成形用金型内に充
填して圧縮成形後、この成形体を加熱して焼結する方法
が使用されている。この場合、圧力を印加しない通常の
焼結のみでは、焼結後においても焼結体中に封入された
気孔が残留し。Conventionally, when manufacturing ceramics, a method has been used in which raw material powders mixed with predetermined components are filled into a mold, compression molded, and then the molded body is heated and sintered. ing. In this case, if only normal sintering without applying pressure is performed, the pores sealed in the sintered body remain even after sintering.
高密度、高性能のセラミックスを得ることができない、
特に前記のようなシンチレータ材料におけるように、放
射線若しくは光線の透過率によってその特性が影響され
るものにおいては、焼結後の密度を可能な限り理論密度
に近付ける必要がある。Unable to obtain high-density, high-performance ceramics,
Particularly in scintillator materials such as those mentioned above, whose properties are affected by the transmittance of radiation or light, it is necessary to bring the density after sintering as close to the theoretical density as possible.
このため高圧成形、加熱成形、加圧焼結等の手段が採用
されているが、このうち加圧焼結、就中Htp焼結によ
るものが成形密度の向上と共に、焼結温度を高くしても
過大な粒成長を伴うことなく残留気孔を略完全に除去す
ることができるため近年において多用されている。HI
P焼結においては5例えば軟鋼製の中空円筒状のカプセ
ル内に原料粉末若しくは予備成形体を収容し、カプセル
内の空気を除去した後においてカプセルを密封しHIP
焼結を行うのであるが、焼結体を取り出すためにカプセ
ルを除去する必要があり、旋削および/または研削手段
によるものが通常である。For this purpose, methods such as high-pressure molding, heat molding, and pressure sintering have been adopted. Among these, pressure sintering, especially Htp sintering, improves the compacting density and increases the sintering temperature. It has also been widely used in recent years because it can almost completely remove residual pores without causing excessive grain growth. HI
In P sintering, the raw material powder or preform is housed in a hollow cylindrical capsule made of mild steel, for example, and after removing the air inside the capsule, the capsule is sealed and HIPed.
Although sintering is carried out, the capsule must be removed in order to take out the sintered body, which is usually done by turning and/or grinding means.
上記従来の手段においては1例えばカプセルの両端部に
接着剤を介して保持治具を一体に固着しこの保持治具を
介して旋盤若しくは研削盤の両センタ間に保持し、カプ
セルの円筒面を逐次旋削若しくは研削加工し、カプセル
内の焼結体を取出すのである。しかしながら、上記の場
合カプセルと焼結体とは単に圧着状態で接触しているの
みであるため、旋削若しくは研削の終了時間近になると
カプセルによる焼結体の圧着力が激減若しくは消失し、
相対移動を起こすこともあるのみならずカプセルの消失
により焼結体が両センタ間から落下するという問題点が
ある。このためカプセルの除去作業が極めて煩雑となる
のみならず、焼結体の落下により亀裂1割れ、破損その
他の不都合を惹起することとなる。In the above conventional means, 1, for example, a holding jig is fixed to both ends of the capsule through an adhesive, and the capsule is held between both centers of a lathe or grinding machine via this holding jig, so that the cylindrical surface of the capsule is The sintered body inside the capsule is removed by sequential turning or grinding. However, in the above case, the capsule and the sintered body are only in contact with each other in a crimped state, so as the time approaches the end of turning or grinding, the pressure of the capsule against the sintered body decreases dramatically or disappears.
There is a problem that not only may relative movement occur, but also that the sintered body may fall from between the two centers due to the disappearance of the capsule. This not only makes the capsule removal operation extremely complicated, but also causes cracks, breakage, and other inconveniences when the sintered body falls.
本発明は上記従来技術に存在する問題点を解決し、HI
P時に使用したカプセルの除去を容易かつ円滑に行い得
るようなセラミックスの製造方法を提供することを目的
とするものである。The present invention solves the problems existing in the above-mentioned prior art, and
It is an object of the present invention to provide a method for producing ceramics that allows easy and smooth removal of capsules used during P.
上記目的を達成するために2本発明においては。 In order to achieve the above object, there are two aspects of the present invention.
金属材料からなる中空円筒状のカプセル内に、原料粉末
若しくは予備成形体を収容し、カプセルを脱気密封し、
熱間静水圧加圧焼結した後、カプセルを機械加工により
除去するセラミックスの製造方法において、端部内面に
原料粉末若しくは予備成形体内に突出する突起を設ける
。という技術的手段を採用した。The raw material powder or preform is placed in a hollow cylindrical capsule made of a metal material, the capsule is degassed and sealed,
In a ceramic manufacturing method in which a capsule is removed by machining after hot isostatic pressing and sintering, a protrusion that protrudes into the raw material powder or the preform is provided on the inner surface of the end portion. A technical method was adopted.
上記の構成により、カプセルの円筒面が除去された後に
おいても、カプセルの両端面は突起を介して焼結体と一
体化した状態を継続し1両センタ間における焼結体の保
持を確保できるのである。With the above configuration, even after the cylindrical surface of the capsule is removed, both end surfaces of the capsule continue to be integrated with the sintered body through the protrusions, and the sintered body can be maintained between the two centers. It is.
図は本発明の実施例におけるカプセルと焼結体を示す一
部断面正面図である0図において1はカプセルであり1
例えば軟鋼により中空円筒状に形成し1例えばHIP&
の外径60u、長さ200mm。The figure is a partially sectional front view showing a capsule and a sintered body in an embodiment of the present invention. In figure 0, 1 is a capsule;
For example, it is formed into a hollow cylindrical shape from mild steel and
The outer diameter is 60u and the length is 200mm.
肉厚2Mのものである。2は突起であり、カプセル1の
端部1aの内面に略2鶴突出する円環状に形成し、カプ
セルlと一体とする。突起2の形成に際しては溶接肉盛
手段によってもよく、またカプセルlの成形時において
例えば成形用金型によって一体に膨出させてもよい、3
は焼結体であり。It has a wall thickness of 2M. Reference numeral 2 denotes a protrusion, which is formed in the shape of an annular ring projecting from the inner surface of the end portion 1a of the capsule 1, and is integrated with the capsule 1. The protrusions 2 may be formed by welding overlay means, or may be bulged out integrally by, for example, a mold when molding the capsule 1.
is a sintered body.
カプセル1内に隙間なく一体に圧接されており。It is integrally pressed into the capsule 1 without any gaps.
突起2は焼結体3とも一体に圧接されている。The protrusion 2 is also integrally pressed against the sintered body 3.
上記のようなHIP焼結後の焼結体3を収容したカプセ
ル1の端部1a、laを例えば旋盤の両センタ間に保持
した状態で2円筒面1bを逐次旋削するのであるが1円
筒面lbを完全に除去した後においても端部1aは突起
2を介して焼結体3と一体化した状態を継続する。従っ
て焼結体3を両センタ間に保持し、落下することなく回
転させ得る。カプセル1の円筒面1bを除去後において
両センタ間から焼結体3を取外せば、端部1aの除去は
極めて容易であり、格別の困難性はない。While the ends 1a and la of the capsule 1 containing the sintered body 3 after HIP sintering as described above are held, for example, between both centers of a lathe, two cylindrical surfaces 1b are sequentially turned. Even after lb is completely removed, the end portion 1a continues to be integrated with the sintered body 3 via the protrusion 2. Therefore, the sintered body 3 can be held between both centers and rotated without falling. If the sintered body 3 is removed from between both centers after the cylindrical surface 1b of the capsule 1 is removed, the end portion 1a can be removed very easily and without any particular difficulty.
本実施例においては、カプセルを軟鋼で形成した例を示
したが、軟鋼以外の金属材料で形成してもよ(、要する
にHIP焼結時における加熱に耐え、かつ焼結体に求め
られる所望の特性を損なわないものであればよい、また
カプセルの端部内面に設ける突起の形状は円環以外の形
状を選定することができ、要するに焼結体と一体に圧接
若しくは密着すると共に、旋削若しくは研削時における
回転トルクを焼結体に伝達し得るように形成すればよい
。In this example, an example is shown in which the capsule is made of mild steel, but it may also be made of a metal material other than mild steel (in short, it can withstand the heating during HIP sintering and meet the desired requirements for the sintered body). The shape of the protrusion provided on the inner surface of the end of the capsule can be any shape other than a circular ring, as long as it does not impair its properties. What is necessary is just to form it so that the rotational torque at the time can be transmitted to a sintered compact.
本発明は以上記述のような構成および作用であるから、
HIP焼結時に使用したカプセルを容易かつ円滑に除去
できると共に、カプセルの除去に際して従来経験した焼
結体の落下事故はもとより。Since the present invention has the structure and operation as described above,
Capsules used during HIP sintering can be removed easily and smoothly, and the accident of falling sintered bodies that has conventionally been experienced when removing capsules can be avoided.
焼結体に発生する割れ若しくは破壊事故を皆無とするこ
とができるという効果がある。This has the effect of completely eliminating cracking or destruction accidents that occur in the sintered body.
図は本発明の実施例におけるカプセルと焼結体とを示す
一部断面正面図である。
1:カプセル。
:突起
:焼結体。The figure is a partially sectional front view showing a capsule and a sintered body in an embodiment of the present invention. 1: Capsule. : Protrusion: Sintered body.
Claims (1)
末若しくは予備成形体を収容し、カプセルを脱気密封し
、熱間静水圧加圧焼結した後、カプセルを機械加工によ
り除去するセラミックスの製造方法において、端部内面
に原料粉末若しくは予備成形体内に突出する突起を設け
たカプセルを使用することを特徴とするセラミックスの
製造方法。Production of ceramics by accommodating raw material powder or a preformed body in a hollow cylindrical capsule made of metal material, deaerating the capsule, sealing it, sintering it under hot isostatic pressure, and then removing the capsule by machining. 1. A method for producing ceramics, characterized in that a capsule is used, the inner surface of the end of which is provided with a protrusion that protrudes into the raw material powder or the preform.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1106701A JPH02283674A (en) | 1989-04-26 | 1989-04-26 | Production of ceramics |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1106701A JPH02283674A (en) | 1989-04-26 | 1989-04-26 | Production of ceramics |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH02283674A true JPH02283674A (en) | 1990-11-21 |
Family
ID=14440312
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1106701A Pending JPH02283674A (en) | 1989-04-26 | 1989-04-26 | Production of ceramics |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH02283674A (en) |
-
1989
- 1989-04-26 JP JP1106701A patent/JPH02283674A/en active Pending
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