JPH04338172A - Method for sintering ceramic or metal powder - Google Patents
Method for sintering ceramic or metal powderInfo
- Publication number
- JPH04338172A JPH04338172A JP3135992A JP13599291A JPH04338172A JP H04338172 A JPH04338172 A JP H04338172A JP 3135992 A JP3135992 A JP 3135992A JP 13599291 A JP13599291 A JP 13599291A JP H04338172 A JPH04338172 A JP H04338172A
- Authority
- JP
- Japan
- Prior art keywords
- sintering
- powder
- jig
- held
- powder compact
- 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.)
- Withdrawn
Links
- 238000005245 sintering Methods 0.000 title claims abstract description 70
- 239000000843 powder Substances 0.000 title claims description 43
- 238000000034 method Methods 0.000 title claims description 11
- 239000000919 ceramic Substances 0.000 title claims description 7
- 239000002184 metal Substances 0.000 title claims description 7
- BPJYAXCTOHRFDQ-UHFFFAOYSA-L tetracopper;2,4,6-trioxido-1,3,5,2,4,6-trioxatriarsinane;diacetate Chemical compound [Cu+2].[Cu+2].[Cu+2].[Cu+2].CC([O-])=O.CC([O-])=O.[O-][As]1O[As]([O-])O[As]([O-])O1.[O-][As]1O[As]([O-])O[As]([O-])O1 BPJYAXCTOHRFDQ-UHFFFAOYSA-L 0.000 abstract 5
- 238000000465 moulding 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
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
- Furnace Charging Or Discharging (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は外側に突出する突起部を
有したセラミクス若しくは金属粉体の粉末成形品の焼結
方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for sintering a ceramic or metal powder molded product having an outwardly projecting protrusion.
【０００２】0002
【従来の技術】粉末治金，セラミクスの製造に於て、金
属あるいは無機質の粉末を所定形状に成形する方法は、
金型成形，清水圧成形，ホットプレス，テープ成形，押
出成形，鋳込成形，射出成形等種々ある。しかし、いず
れの方法であっても、成形体は所定の脱バインダー，焼
結工程を経て製品化される。この焼結工程での大きな問
題点は、成形体の焼結収縮に伴う変形である。[Prior Art] In powder metallurgy and ceramics production, the method of forming metal or inorganic powder into a predetermined shape is
There are various methods such as mold molding, fresh water pressure molding, hot press, tape molding, extrusion molding, cast molding, and injection molding. However, in either method, the molded body is manufactured through predetermined binder removal and sintering steps. A major problem in this sintering process is deformation of the compact due to sintering shrinkage.
【０００３】このような焼結収縮に対し、特開昭５７−
２００２７１号公報では、アルミナ粉末等の耐火粉末物
中に粉末成形体を埋設して焼結する方法が開示されてい
る。しかしながらリング状のように異形で貫通穴などを
有している成形体を耐火粉末物中に埋設して焼結すると
、成形体の焼結収縮の際に、耐火粉末物が収縮の抵抗と
なるため不要な変形を生じていた。これに対し、特開昭
６１−１１７１６５号公報では、リング状成形体の貫通
穴に試料ガイド用芯棒を挿通させ、この状態で成形体を
試料ガイド用芯棒に沿って滑らせながら焼結炉内で焼結
している。これにより成形体が自由状態となるため、焼
結収縮に伴う変形を抑制することができる。[0003] In order to deal with such sintering shrinkage,
No. 200271 discloses a method of embedding a powder compact in a refractory powder such as alumina powder and sintering it. However, when a molded body having an irregular shape such as a ring shape and having through-holes is embedded in a refractory powder and sintered, the refractory powder acts as resistance to shrinkage when the molded body shrinks during sintering. This caused unnecessary deformation. On the other hand, in JP-A-61-117165, a core rod for a sample guide is inserted into a through hole of a ring-shaped molded body, and in this state, the molded body is sintered while sliding along the core rod for a sample guide. Sintered in a furnace. This allows the molded body to be in a free state, so that deformation due to sintering shrinkage can be suppressed.
【０００４】0004
【発明が解決しようとする課題】しかしながら特開昭６
１−１１７１６５号公報の方法では、焼結炉内に試料ガ
イド用芯棒を設ける必要があるため、焼結炉が複雑とな
る問題を有していた。また、成形体に試料ガイド用芯棒
を挿通させるには、成形体を仮焼結する必要があるため
、製造工程が複雑となり、製品コストに影響している。
さらには貫通穴を有していない成形体に対しては、この
方法が適用できず、成形体の形状に制限が加わった適用
範囲の狭いものとなっていた。[Problem to be solved by the invention] However, in JP-A No. 6
The method disclosed in Japanese Patent No. 1-117165 has a problem in that the sintering furnace becomes complicated because it is necessary to provide a core rod for guiding the sample in the sintering furnace. Furthermore, in order to insert the sample guide core rod into the molded body, it is necessary to pre-sinter the molded body, which complicates the manufacturing process and affects the product cost. Furthermore, this method cannot be applied to molded bodies that do not have through holes, and the shape of the molded body is restricted, resulting in a narrow range of application.
【０００５】本発明は以上の点に鑑みてなされたもので
あって、リング状の成形体のように貫通孔等が設けられ
ていたり、平面の板に直接設置できないような突起を有
するような異形の形状の粉末成形体を焼結する場合に、
複雑な装置を用いずに焼結収縮に伴う変形を発生させる
ことなく良好な焼結体を得る焼結方法を提供することを
目的とする。The present invention has been made in view of the above points, and is applicable to ring-shaped molded bodies that are provided with through holes, etc., or that have protrusions that cannot be directly installed on a flat plate. When sintering powder compacts with irregular shapes,
It is an object of the present invention to provide a sintering method for obtaining a good sintered body without using complicated equipment and without causing deformation due to sintering shrinkage.
【０００６】[0006]
【課題を解決するための手段】本発明は、外側に突出す
る突起部を有し、全体がリング状に成形されたセラミク
ス若しくは金属粉体の粉末成形体を焼結するのに際し、
前記突起部が自由状態で挿入される切欠部を上面に貫通
形成した焼結治具により、前記粉末成形体を自由状態で
保持しながら焼結することを特徴とするものである。[Means for Solving the Problems] The present invention provides the following advantages when sintering a powder molded body of ceramic or metal powder which has an outwardly projecting protrusion and is formed into a ring shape as a whole.
The present invention is characterized in that the powder compact is sintered while being held in a free state by a sintering jig having a notch formed through the upper surface thereof into which the protrusion is inserted in a free state.
【０００７】[0007]
【作用】上記構成では焼結治具の切欠部に粉末成形体の
突起部を自由状態で挿入すると共に、粉末成形体自体を
焼結治具上に自由状態で保持して焼結するため、粉末成
形体は抵抗を受けることなく全体が焼結収縮し、焼結収
縮に伴う変形の発生がなくなる。[Operation] In the above structure, the protrusion of the powder compact is inserted into the notch of the sintering jig in a free state, and the powder compact itself is held in a free state on the sintering jig and sintered. The entire powder compact undergoes sintering shrinkage without being subjected to resistance, and no deformation occurs due to sintering shrinkage.
【０００８】[0008]
【実施例１】図１ないし図５は本発明の実施例１を示す
。図１および図２は焼結に供される粉末成形体１であり
、全体がリング形状に成形されることにより軸方向の貫
通穴２が形成されている。この粉末成形体１はステンレ
ス（ＳＵＳ３１６Ｌ）の粉末により図示の形状に成形さ
れるものであり、外殻となるリング部３は図２に示すよ
うに、一方向（図２において右方向）に弯曲されており
、平面板上に直接接触するような端面を有していない。
また、このリング部２の一方側には円弧状の突起部４が
軸方向の外側に突出形成されると共に、他方側にも突起
部４と反対方向に突出する突起部５が形成されている。
さらにリング部２の内面には径方向に突出する円板状の
内側突起部６が形成されている。そして、これらの突起
部４，５および６には小孔７がそれぞれ開設されている
。Embodiment 1 FIGS. 1 to 5 show Embodiment 1 of the present invention. 1 and 2 show a powder compact 1 to be subjected to sintering, and the entire body is molded into a ring shape to form an axial through hole 2. As shown in FIG. This powder compact 1 is molded into the shape shown in the figure using stainless steel (SUS316L) powder, and the ring portion 3 serving as the outer shell is curved in one direction (to the right in FIG. 2) as shown in FIG. It does not have an end surface that comes into direct contact with the flat plate. Further, an arcuate protrusion 4 is formed on one side of the ring portion 2 so as to protrude outward in the axial direction, and a protrusion 5 that protrudes in the opposite direction to the protrusion 4 is also formed on the other side. . Furthermore, a disk-shaped inner protrusion 6 is formed on the inner surface of the ring portion 2 and protrudes in the radial direction. A small hole 7 is formed in each of these projections 4, 5, and 6.
【０００９】図３および図４はこの粉末成形体１の焼結
に使用される焼結治具１０を示す。この焼結治具１０は
全体がアルミナにより形成されるものであり、下面１１
は焼結炉内に載置されるように平板状となっている。ま
た、上面は長手方向中央に向かって両側から低くなる傾
斜面１２となっており、さらに長手方向中央には切欠部
１３が貫通形成されている。傾斜面１２は弯曲された粉
末成形体１のリング部３の端面を迎合するものであり、
その表面は所定の滑らかさを有するように研磨されてい
る。一方、切欠部１３はリング部３の一方向に突出した
突起部４が挿入されるものである。この切欠部１３は突
起部４が接触することのない自由状態で挿入されるよう
に、その幅が設定されている。FIGS. 3 and 4 show a sintering jig 10 used for sintering this powder compact 1. FIG. This sintering jig 10 is entirely made of alumina, and the lower surface 11
has a flat plate shape so as to be placed in the sintering furnace. Further, the upper surface has an inclined surface 12 that becomes lower from both sides toward the center in the longitudinal direction, and a notch 13 is formed through the center in the longitudinal direction. The inclined surface 12 fits the end surface of the ring portion 3 of the curved powder compact 1,
Its surface is polished to a predetermined smoothness. On the other hand, the notch 13 is into which the protrusion 4 of the ring part 3 that protrudes in one direction is inserted. The width of the notch 13 is set so that the protrusion 4 is inserted freely without contact.
【００１０】図５は、この焼結治具１０により粉末成形
体１を保持した状態を示す。図示のように焼結治具１０
の切欠部１３内に突起部４が自由状態で挿入されると共
に、傾斜面１２上にリング部３が載置され、粉末成形体
１は全体が自由状態で焼結治具１０に保持されている。
そして、この保持状態で焼結治具１０を真空焼結炉（図
示省略）に設置して焼結を行う。この焼結は例えば、炉
内の雰囲気を１０−４Ｔｏｒｒまで減圧し加熱を開始す
る。そして、最高温度１３２０℃まで毎時２００℃で昇
温し、最高温度で１時間保持するように行う。この時、
リング部材１は収縮するが、焼結治具１０の傾斜に沿っ
て収縮し、かつ突起部４が切欠部１３に自由状態で挿入
されて焼結治具１０には接していないため、粉末成形体
１全体に対して収縮抵抗となる部分がない。その後、加
熱を終了し放冷後、焼結を完了したリング部材１を炉内
より取出す。FIG. 5 shows the state in which the powder compact 1 is held by this sintering jig 10. As shown, the sintering jig 10
The protrusion 4 is inserted into the notch 13 in a free state, the ring part 3 is placed on the inclined surface 12, and the powder compact 1 is held in the sintering jig 10 in a free state as a whole. There is. Then, in this held state, the sintering jig 10 is placed in a vacuum sintering furnace (not shown) to perform sintering. In this sintering, for example, the atmosphere in the furnace is reduced to 10 −4 Torr and heating is started. Then, the temperature is raised at a rate of 200°C per hour to a maximum temperature of 1320°C, and the temperature is maintained at the maximum temperature for 1 hour. At this time,
Although the ring member 1 contracts, it contracts along the inclination of the sintering jig 10, and the protrusion 4 is inserted into the notch 13 in a free state and is not in contact with the sintering jig 10, so that powder forming is not possible. There is no part of the entire body 1 that acts as contraction resistance. Thereafter, after heating is finished and allowed to cool, the ring member 1 that has been sintered is taken out from the furnace.
【００１１】以上のような焼結治具１０を使用した焼結
では、粉末成形体１が自由状態で保持され、焼結治具１
０の傾斜面１２に沿ってスムーズに収縮するため、不要
な変形を生じることがない。また焼結治具１０は粉末成
形体１を載置するだけの簡単な形状であるため、焼結炉
全体を複雑にする必要がなく、通常の真空焼結炉を使用
することができる。なお、この焼結治具１０は図示した
形状以外の粉末成形体に対しても同様に適用することが
できる。また、粉末成形体はセラミクスやその他の金属
粉体により形成されたものを使用することができる。In sintering using the sintering jig 10 as described above, the powder compact 1 is held in a free state, and the sintering jig 1
Since it contracts smoothly along the zero slope 12, no unnecessary deformation occurs. Furthermore, since the sintering jig 10 has a simple shape on which the powder compact 1 is placed, there is no need to complicate the entire sintering furnace, and a normal vacuum sintering furnace can be used. Note that this sintering jig 10 can be similarly applied to powder compacts having shapes other than those shown. Moreover, the powder compact formed from ceramics or other metal powder can be used.
【００１２】0012
【実施例２】図６は本発明の実施例２に使用される焼結
治具１０を示し、上面が櫛歯形状に成形されている。す
なわち、三角形状の突条１４が平行に複数隣接した形状
となっており、この突条１４の間に切欠部１５が貫通形
成されている。切欠部１５は粉末成形体１の突起部４（
図１および図２参照）が自由状態で挿入されるものであ
り、焼結治具１０は全体が酸化ジルコニアにより成形さ
れている。このような焼結治具１０に対し、その突起部
４を切欠部１５に挿入し、そのリング部３を突条１４に
載置して粉末成形体１を焼結治具１０にセットし、焼結
を行う。この場合にも、粉末成形体１は全体が自由状態
で収縮抵抗となる部分がないため、変形のない焼結を行
うことができる。Embodiment 2 FIG. 6 shows a sintering jig 10 used in Embodiment 2 of the present invention, the upper surface of which is formed into a comb-teeth shape. That is, a plurality of triangular protrusions 14 are arranged adjacent to each other in parallel, and a notch 15 is formed to penetrate between the protrusions 14 . The notch 15 is formed by the protrusion 4 of the powder compact 1 (
1 and 2) is inserted in a free state, and the sintering jig 10 is entirely molded from oxidized zirconia. In such a sintering jig 10, the protrusion 4 is inserted into the notch 15, the ring part 3 is placed on the protrusion 14, and the powder compact 1 is set in the sintering jig 10. Perform sintering. In this case as well, since the powder compact 1 is entirely free and has no portion that acts as shrinkage resistance, sintering can be performed without deformation.
【００１３】[0013]
【実施例３】図７は本発明の実施例３に使用される焼結
治具１０を示す。この焼結治具１０は全体がアルミナに
より成形されていると共に、上面には切欠部１６が格子
状に形成されており、この切欠部１６に粉末成形体１の
突起部４が挿入される。この焼結治具１０を用いて焼結
すると、切欠部１６が縦横方向に設けられているため、
粉末成形体の収縮方向が予想と異なっていても、変形す
ることなく焼結収縮させることができる。Embodiment 3 FIG. 7 shows a sintering jig 10 used in Embodiment 3 of the present invention. This sintering jig 10 is entirely molded from alumina, and has cutouts 16 formed in the shape of a lattice on its upper surface, into which the protrusions 4 of the powder compact 1 are inserted. When sintering using this sintering jig 10, since the notches 16 are provided in the vertical and horizontal directions,
Even if the shrinkage direction of the powder compact is different from expected, it can be sintered and shrunk without being deformed.
【００１４】[0014]
【発明の効果】本発明は粉末成形体の突起部を焼結治具
の切欠部に自由状態で挿入すると共に、粉末成形体の全
体を焼結治具に自由状態で保持して焼結するため、焼結
収縮の抵抗がなく、変形のない良好な焼結を行うことが
できる。[Effects of the Invention] According to the present invention, the protrusion of a powder compact is inserted into the notch of a sintering jig in a free state, and the entire powder compact is held in a free state in the sintering jig for sintering. Therefore, there is no resistance to sintering shrinkage, and good sintering can be performed without deformation.
【図１】本発明により焼結される粉末成形体の平面図。FIG. 1 is a plan view of a powder compact sintered according to the present invention.
【図２】粉末成形体の断面図。FIG. 2 is a sectional view of a powder compact.
【図３】本発明の実施例１に使用される焼結治具の平面
図。FIG. 3 is a plan view of a sintering jig used in Example 1 of the present invention.
【図４】本発明の実施例１に使用される焼結治具の側面
図。FIG. 4 is a side view of a sintering jig used in Example 1 of the present invention.
【図５】粉末成形体の保持状態を示す斜視図。FIG. 5 is a perspective view showing the state in which the powder compact is held.
【図６】本発明の実施例２に使用される焼結治具の斜視
図。FIG. 6 is a perspective view of a sintering jig used in Example 2 of the present invention.
【図７】本発明の実施例３に使用される焼結治具の斜視
図。FIG. 7 is a perspective view of a sintering jig used in Example 3 of the present invention.
１ 粉末成形体 ２ リング部 ４ 突起部 ５ 焼結治具 １３ 切欠部 1 Powder compact 2 Ring part 4 Protrusion 5 Sintering jig 13 Notch
Claims (1)
リング状に成形されたセラミクス若しくは金属粉体の粉
末成形体を焼結するのに際し、前記突起部が自由状態で
挿入される切欠部を上面に貫通形成した焼結治具により
、前記粉末成形体を自由状態で保持しながら焼結するこ
とを特徴とするセラミクス若しくは金属粉体の焼結方法
。1. A notch into which the protrusion is inserted in a free state when sintering a powder compact of ceramics or metal powder, which has a protrusion projecting outward and is formed into a ring shape as a whole. 1. A method for sintering ceramics or metal powder, characterized in that the powder compact is sintered while being held in a free state using a sintering jig having a section formed through the upper surface thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3135992A JPH04338172A (en) | 1991-05-10 | 1991-05-10 | Method for sintering ceramic or metal powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3135992A JPH04338172A (en) | 1991-05-10 | 1991-05-10 | Method for sintering ceramic or metal powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04338172A true JPH04338172A (en) | 1992-11-25 |
Family
ID=15164667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3135992A Withdrawn JPH04338172A (en) | 1991-05-10 | 1991-05-10 | Method for sintering ceramic or metal powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04338172A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007262451A (en) * | 2006-03-27 | 2007-10-11 | Ntn Corp | Method for producing sintered product |
| JP2015020304A (en) * | 2013-07-17 | 2015-02-02 | コーア株式会社 | Firing setter and production method of ceramic laminated substrate |
| CN115307443A (en) * | 2021-05-07 | 2022-11-08 | 柯马杜股份有限公司 | Support frame for use in a method for sintering green bodies, in particular for watchmaking |
-
1991
- 1991-05-10 JP JP3135992A patent/JPH04338172A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007262451A (en) * | 2006-03-27 | 2007-10-11 | Ntn Corp | Method for producing sintered product |
| JP4722742B2 (en) * | 2006-03-27 | 2011-07-13 | Ｎｔｎ株式会社 | Manufacturing method of sintered products |
| JP2015020304A (en) * | 2013-07-17 | 2015-02-02 | コーア株式会社 | Firing setter and production method of ceramic laminated substrate |
| CN115307443A (en) * | 2021-05-07 | 2022-11-08 | 柯马杜股份有限公司 | Support frame for use in a method for sintering green bodies, in particular for watchmaking |
| JP2022173070A (en) * | 2021-05-07 | 2022-11-17 | コマディール・エス アー | Support frame for method for sintering material body, in particular for watchmaking |
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