JPS6376804A - Pack for powder metallurgy and its production - Google Patents
Pack for powder metallurgy and its productionInfo
- Publication number
- JPS6376804A JPS6376804A JP22020686A JP22020686A JPS6376804A JP S6376804 A JPS6376804 A JP S6376804A JP 22020686 A JP22020686 A JP 22020686A JP 22020686 A JP22020686 A JP 22020686A JP S6376804 A JPS6376804 A JP S6376804A
- Authority
- JP
- Japan
- Prior art keywords
- powder metallurgy
- slurry
- ceramic
- polyurethane foam
- ceramic slurry
- 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
- 238000004663 powder metallurgy Methods 0.000 title claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 239000000919 ceramic Substances 0.000 claims abstract description 35
- 239000002002 slurry Substances 0.000 claims abstract description 24
- 229920005830 Polyurethane Foam Polymers 0.000 claims abstract description 20
- 239000011496 polyurethane foam Substances 0.000 claims abstract description 20
- 230000005484 gravity Effects 0.000 claims abstract description 11
- 239000011148 porous material Substances 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 11
- 210000000170 cell membrane Anatomy 0.000 claims description 7
- 239000002184 metal Substances 0.000 abstract description 4
- 239000000843 powder Substances 0.000 abstract description 3
- 239000003513 alkali Substances 0.000 abstract description 2
- 238000000748 compression moulding Methods 0.000 abstract description 2
- 238000001354 calcination Methods 0.000 abstract 3
- 239000006260 foam Substances 0.000 abstract 1
- 238000010304 firing Methods 0.000 description 9
- 239000002994 raw material Substances 0.000 description 9
- 229910052581 Si3N4 Inorganic materials 0.000 description 6
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 6
- 239000002245 particle Substances 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 230000008646 thermal stress Effects 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 2
- 229910052863 mullite Inorganic materials 0.000 description 2
- 235000019353 potassium silicate Nutrition 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Furnace Charging Or Discharging (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、粉末冶金用棚板と、その製造方法に関する
。DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a shelf board for powder metallurgy and a method for manufacturing the same.
（従来の技術）
粉末冶金とは、一種または数種の金属粉末を所要の形状
に圧縮成形し、それを焼成炉内で焼成して金属成形品を
得る方法である。その際、金属粉末の圧縮成形品が変形
するのを防ぐため、粉末冶金用の棚板にその圧縮成形品
を載せて焼成を行うことが多い。(Prior Art) Powder metallurgy is a method of compression molding one or more types of metal powder into a desired shape and firing it in a firing furnace to obtain a metal molded product. At this time, in order to prevent the compression molded product of metal powder from being deformed, the compression molded product is often placed on a shelf board for powder metallurgy and fired.
ところで、粉末冶金用棚板は、前記圧縮成形品の焼成時
に１０００℃以上に加熱されるだけでなく、圧縮成形品
の焼成開始時及び焼成終了時に、又、焼成炉内において
も急激な温度変化が加わるものである。そのため従来に
あっては、高温に耐え、かつ強度の高い炭素、窒化硅素
、炭化硅素等から成形した棚板が用いられている。By the way, shelf boards for powder metallurgy are not only heated to 1000°C or higher during firing of the compression molded product, but also subjected to rapid temperature changes at the start and end of firing of the compression molded product, and also in the firing furnace. is added. Therefore, in the past, shelf boards molded from carbon, silicon nitride, silicon carbide, etc., which can withstand high temperatures and have high strength, have been used.
（発明が解決しようとする問題点）
しかしながら、前記窒化硅素等からなる棚板は、緻密な
構造からなるために熱の通りが悪く、棚板全体が均一な
温度に加熱、冷却されるのに長時間を要し、部分的に大
きな温度差を生じ易い。特に圧縮成形品の載置された部
分は、他部に比べて温度変化が遅くなり、他部との温度
差が大となる。(Problems to be Solved by the Invention) However, the shelf board made of silicon nitride etc. has a dense structure, so heat does not pass through easily, and although the entire shelf board is heated and cooled to a uniform temperature, It takes a long time and tends to cause large temperature differences in some areas. In particular, the temperature of the part where the compression molded product is placed changes more slowly than other parts, and the temperature difference with other parts becomes large.
そのため、その部分には大なる温度差による熱応力が発
生するので、強度に優れる窒化硅素等からなる棚板であ
っても割れを生じ易く、長期に亘る使用が不可能であっ
た。Therefore, thermal stress is generated in that part due to a large temperature difference, so even shelf boards made of silicon nitride or the like, which have excellent strength, are prone to cracking and cannot be used for a long period of time.
また、棚板は圧縮成形品の焼結時に駆動ベルト上に載置
されて焼成炉内を移動するのであるが、窒化硅素等から
なる棚板は緻密な構造からなるために重く、駆動ベルト
にかかる負担が大となるので、そのベルトの損傷を速め
る問題もある。In addition, when sintering compression-molded products, shelf boards are placed on a drive belt and moved through the firing furnace, but shelf boards made of silicon nitride, etc., have a dense structure and are heavy, so Since such a load is large, there is also the problem of accelerating damage to the belt.
しかも、窒化硅素等は高価な原材料であるために、棚板
が高価なものとなり、かつその棚板の耐久性が劣ること
から消耗費が大となる問題もある。Moreover, since silicon nitride and the like are expensive raw materials, the shelves are expensive, and the durability of the shelves is poor, resulting in high consumption costs.
この発明は、従来の粉末冶金用棚板が有している問題、
即ち耐久性に劣る問題、重い問題、及び消耗費が大なる
問題を解決した粉末冶金用棚板、及びその粉末冶金用棚
板の製造方法を提供せんとするものである。This invention solves the problems that conventional shelf boards for powder metallurgy have,
That is, it is an object of the present invention to provide a shelf board for powder metallurgy that solves the problems of poor durability, heavy problems, and high consumption costs, and a method for manufacturing the shelf board for powder metallurgy.
（問題点を解決するための手段）
この発明による粉末冶金用棚板は、空孔率を４０〜９０
％、かさ比重を０．４０〜１．５０とする、連通気孔構
造のセラミックス多孔質板からなるものである。(Means for solving the problem) The shelf board for powder metallurgy according to the present invention has a porosity of 40 to 90.
%, and the bulk specific gravity is 0.40 to 1.50, and is made of a ceramic porous plate with a continuous pore structure.
また、その粉末冶金用棚板の製造方法は、セル膜を除去
したポリウレタンフォームの骨格にセラミックスラリ−
を付着させ、乾燥後これを焼成して、空孔率４０〜９０
％、かさ比重０．４０〜１．５０からなる連通気孔構造
の多孔質板を得ることを特徴とするものである。In addition, the method for manufacturing shelves for powder metallurgy involves adding ceramic slurry to the skeleton of polyurethane foam from which the cell membrane has been removed.
is attached, and after drying, it is fired to obtain a porosity of 40 to 90.
% and a bulk specific gravity of 0.40 to 1.50.
（作用）
この発明による粉末冶金用棚板は、セラミックス多孔質
板からなるために耐熱性に優れ、かつそのかさ比重を０
．４０〜１．５０ 、空孔率を４０〜９０％とするもの
であるため、粉末冶金用棚板として必要な強度を有する
。しかも、連通気孔構造からなるためにその連通気孔を
介して熱が通るので、棚板全体への熱の伝播、及び内部
からの熱の発散が良好となり、棚板の温度が速やかに均
一となる。従って、粉末冶金の焼成時に、棚板に部分的
に大きな温度差を生じることがなく、その温度差による
熱応力が生じないことから、棚板に割れ等の損傷発生の
虞れがなくなり、棚板の耐久性が増大する。(Function) The shelf board for powder metallurgy according to the present invention has excellent heat resistance because it is made of a porous ceramic board, and its bulk specific gravity is 0.
．． 40 to 1.50, and the porosity is 40 to 90%, so it has the strength necessary as a shelf board for powder metallurgy. Moreover, since it has a continuous vent structure, heat passes through the continuous vents, so heat propagates to the entire shelf board and heat dissipates from the inside, and the temperature of the shelf board quickly becomes uniform. . Therefore, when powder metallurgy is fired, there is no large temperature difference locally on the shelf board, and no thermal stress is generated due to the temperature difference, so there is no risk of cracking or other damage to the shelf board. The durability of the board increases.
また、空孔率が４０〜９０％の多孔体からなるため、棚
板は軽量なものとなる。Moreover, since it is made of a porous material with a porosity of 40 to 90%, the shelf board is lightweight.
次に、粉末冶金用棚板の製造方法について記す。Next, a method for manufacturing a shelf board for powder metallurgy will be described.
この製造方法に用いられるセル膜を除去したポリウレタ
ンフォームは、三次元網目状の骨格のみからなるもので
ある。従って、その骨格にセラミックスラリ−を付着さ
せることにより、スラリー中のセラミックス粒子が三次
元網目状となってその骨格に付着する。そして、そのポ
ウリレクンフオームの骨格は、乾燥後の焼成によって焼
失し、それと同時に骨格に付着していたセラミックス粒
子が焼成して、連通気孔構造からなるセラミックス多孔
質板が形成され、粉末冶金用の棚板となる。The polyurethane foam used in this manufacturing method from which the cell membrane has been removed consists only of a three-dimensional network skeleton. Therefore, by attaching the ceramic slurry to the skeleton, the ceramic particles in the slurry form a three-dimensional network and adhere to the skeleton. Then, the skeleton of the polyreconform is burned out by firing after drying, and at the same time, the ceramic particles attached to the skeleton are fired, forming a porous ceramic plate with a continuous pore structure, which can be used for powder metallurgy. It becomes a shelf board.
（実施例） 以下実施例に基づいてこの発明を説明する。(Example) The present invention will be explained below based on Examples.
０第１実施例
合成ムライト４０重量部、アルミナ４０重量部、カオリ
ン２０重量部、水ガラス５重量部、水２８重量部からな
る原料を混合し、セラミックスラリ−を調製する。この
セラミックスラリ−を、アルカリ処理等の手段によりセ
ル膜を除去した直径１００ ｍｍ、厚み２０ｍｍ、セル
サイズ１３ｐｐｉ のポリウレタンフォームに含浸させ
る。この含浸量は、後述する焼成後のかさ比重が１．０
となる量であり、過剰のセラミックスラリ−は、圧縮等
により除去する。この後、ポリウレタンフォームの表面
に、その表面の気孔を塞がないようにして、セラミック
スラリ−をスプレー等により塗布する。このセラミック
スラリ−を塗布する表面は、ボリウ°レタンフオームの
側面又は上下面あるいは全表面とする。次いでこれを十
分に乾燥させた後加熱し、１４８０ ｔ：で２時間焼成
した後自然冷却し、ムライト質からなる粉末冶金用棚板
を得た。加熱時の昇温速度は、５００℃までを３０℃／
時、１４８０℃までを１００ ℃／時とした。得られた
粉末冶金用の棚板は、空孔率６０％、かさ比重１．０の
連通気孔構造からなるもので、セラミックスラリ−の塗
布された表面の骨格が内部の骨格よりも太くなっている
ため、その表面の強度が高まり、使用時に欠けることが
ないものである。0 First Example Raw materials consisting of 40 parts by weight of synthetic mullite, 40 parts by weight of alumina, 20 parts by weight of kaolin, 5 parts by weight of water glass, and 28 parts by weight of water were mixed to prepare a ceramic slurry. This ceramic slurry is impregnated into a polyurethane foam having a diameter of 100 mm, a thickness of 20 mm, and a cell size of 13 ppi, from which the cell membrane has been removed by means such as alkali treatment. This impregnated amount has a bulk specific gravity of 1.0 after firing, which will be described later.
Excess ceramic slurry is removed by compression or the like. Thereafter, the ceramic slurry is applied to the surface of the polyurethane foam by spraying or the like, taking care not to block the pores on the surface. The surface to which this ceramic slurry is applied is the side surface, top and bottom surface, or the entire surface of the polyurethane foam. Next, this was sufficiently dried and then heated, fired at 1480 t for 2 hours, and then naturally cooled to obtain a shelf board for powder metallurgy made of mullite. The temperature increase rate during heating is 30℃/up to 500℃.
The temperature was 100°C/hour up to 1480°C. The obtained shelf board for powder metallurgy has a continuous hole structure with a porosity of 60% and a bulk specific gravity of 1.0, and the surface skeleton coated with ceramic slurry is thicker than the internal skeleton. This increases the strength of its surface and prevents it from chipping during use.
０第２実施例
セラミックスラリ−を、アルミナ９７ｆｆｉ１部、櫛粘
土３重量部、水ガラス５重量部、水２６重量部から調製
し、第１実施例と同様にしてアルミナ質からなる粉末冶
金用の棚板を得た。0 Second Example A ceramic slurry was prepared from 1 part of alumina 97ffi, 3 parts by weight of comb clay, 5 parts by weight of water glass, and 26 parts by weight of water. I got a shelf.
このようにして得られた粉末冶金用の棚板及び窒化硅素
質からなる従来の棚板とを各々１００枚用いてスチール
の焼成を行い、棚板の使用回数と残存数を調べた。次表
はその結果であ、る。Using 100 of each of the thus obtained powder metallurgy shelf boards and 100 conventional shelf boards made of silicon nitride, steel was fired, and the number of times the shelves were used and the number remaining were determined. The following table shows the results.
なお、この発明による粉末冶金用棚板は、空孔率４０％
未満では熱効率が悪く、空孔率が９０％を越えると棚板
としての強度が不足する。また、かさ比重が０．４０未
満では強度が小さく、１．５０を越えると重くなり過ぎ
、棚板として不向きである。In addition, the shelf board for powder metallurgy according to this invention has a porosity of 40%.
If the porosity is less than 90%, the thermal efficiency will be poor, and if the porosity exceeds 90%, the shelf board will lack strength. Moreover, if the bulk specific gravity is less than 0.40, the strength will be low, and if it exceeds 1.50, it will be too heavy, making it unsuitable for use as a shelf board.
（発明の効果）
この発明による粉末冶金用棚板は、セラミックスらかな
るため耐熱性に優れるものである。また、空孔率を４０
〜９０％、かさ比重を０．４０〜１．５０とする多孔質
板からなるために、軽量性に優れるとともに粉末冶金用
棚板に必要な強度を有するものである。しかも、連通気
孔構造からなるため棚板全体への熱の伝播、及び内部か
らの熱の発散が良好となり、棚板の温度が速やかに均一
となるので、部分的な温度差による熱応力が生じに＜＜
、割れ等の損傷発生の虞れがないもので、優れた耐久性
を有するものである。そして、耐久性と安価な材料から
なることにより消耗費の低減が実現できたのである。(Effects of the Invention) The shelf board for powder metallurgy according to the present invention is made of ceramic and has excellent heat resistance. In addition, the porosity is 40
Since it is made of a porous plate with a bulk specific gravity of 0.40 to 1.50, it is lightweight and has the strength necessary for a shelf board for powder metallurgy. In addition, the continuous vent structure improves the propagation of heat to the entire shelf board and the dissipation of heat from inside, and the temperature of the shelf board quickly becomes uniform, so thermal stress due to local temperature differences occurs. To＜＜
, there is no risk of damage such as cracking, and it has excellent durability. Furthermore, by being made of durable and inexpensive materials, consumption costs could be reduced.
また、粉末冶金用棚板の製造方法にあっては、セル膜を
除去したポリウレタンフォームの骨格に、セラミックス
ラリ−を含′隈により付着させるもののであるため、ス
ラリー中のセラミック粒子が均一に骨格表面に付着する
のではなく、密に付着した部分が散在することになる。In addition, in the method for manufacturing shelf boards for powder metallurgy, ceramic slurry is adhered to the skeleton of polyurethane foam from which the cell membrane has been removed, so the ceramic particles in the slurry are uniformly attached to the skeleton. Instead of adhering to the surface, there will be scattered areas of dense adhesion.
そして、そのセラミック粒子の密状部分が、焼成後のセ
ラミック多孔質板において太い骨組みとなるので、低比
重であっても強度の高い粉末冶金用棚板を得ることがで
きるのである。また、セル膜を除去したポリウレタンフ
ォームの骨格にセラミックスラリ−を付着させるもので
あるため、連通気孔構造の粉末冶金用棚板を確実に製造
することができるのである。Since the dense portions of the ceramic particles form a thick framework in the ceramic porous plate after firing, it is possible to obtain a shelf plate for powder metallurgy with high strength even if the specific gravity is low. Furthermore, since the ceramic slurry is attached to the skeleton of polyurethane foam from which the cell membrane has been removed, it is possible to reliably produce a shelf board for powder metallurgy with a continuous pore structure.
これに対して、ポリウレタンフォーム原料にセラミック
原料を混合し、その原料を用いてポリウレタンフォーム
の発泡を行い、その後焼成して粉末冶金用棚板を製造す
る方法も考えられるが、その場合には、セラミック原料
が均一に分散するため、骨組みの細い粉末冶金用棚板し
か得ることができず、強度不足となる。もし、強度を高
めようとすれば１．セラミック原料の含量を大としなけ
ればならず、その際には棚板の重量が大となるばかりか
、不純物（セラミック原料）の増大により発泡反応が良
好に行なわれなくなり、ポリウレタンフォーム自体が得
られなくなることがある。更に、ポリウレタンフォーム
原料の配合を連通気孔の高い軟質ポリウレタンフォーム
用としても、１００ ％連通気孔からなるポリウレタ
ンフォームを得ることはできず、部分的に独立気孔が存
在したものとなる。そのためこの方法では連通気孔構造
の粉末冶金用棚板を確実に得ることができないのである
。On the other hand, a method can be considered in which a ceramic raw material is mixed with a polyurethane foam raw material, the polyurethane foam is foamed using the raw material, and the polyurethane foam is then fired to manufacture a shelf board for powder metallurgy, but in that case, Because the ceramic raw material is uniformly dispersed, only shelf boards for powder metallurgy with thin frameworks can be obtained, resulting in insufficient strength. If you want to increase the strength, 1. The content of the ceramic raw material must be increased, which not only increases the weight of the shelf board, but also prevents the foaming reaction from occurring properly due to the increase in impurities (ceramic raw material), making it difficult to obtain the polyurethane foam itself. It may disappear. Furthermore, even if the polyurethane foam raw materials are blended for a flexible polyurethane foam with a high level of open pores, it is not possible to obtain a polyurethane foam consisting of 100% open pores, and only partially closed pores exist. Therefore, with this method, it is not possible to reliably obtain a powder metallurgy shelf plate with a continuous hole structure.
かかる点からこの発明による製造方法は、強度及び軽量
性に優れ、かつ連通気孔構造からなる粉末冶金用ＷＡ仮
を製造するのに最適な方法と言えるのである。From this point of view, the manufacturing method according to the present invention can be said to be the most suitable method for manufacturing a temporary WA for powder metallurgy that has excellent strength and lightness and has a continuous hole structure.
Claims (4)
．５０とする、連通気孔構造のセラミックス多孔質板か
らなる粉末冶金用棚板。(1) Porosity: 40-90%, bulk specific gravity: 0.40-1
．． 50, a powder metallurgy shelf board made of a ceramic porous board with a continuous hole structure.
の骨格が内部より太くなっている特許請求の範囲第１項
記載の粉末冶金用棚板。(2) The shelf plate for powder metallurgy according to claim 1, wherein the skeleton of at least one surface of the porous ceramic plate is thicker than the inside.
セラミックスラリーを付着させ、乾燥後これを焼成して
、空孔率４０〜９０％、かさ比重０．４０〜１．５０か
らなる連通気孔構造の多孔質板を得ることを特徴とする
粉末冶金用棚板の製造方法。(3) A ceramic slurry is attached to the polyurethane foam skeleton from which the cell membrane has been removed, and after drying, it is fired to create a continuous pore structure with a porosity of 40 to 90% and a bulk specific gravity of 0.40 to 1.50. A method for manufacturing a shelf board for powder metallurgy, characterized by obtaining a porous board.
ックスラリーを含浸させた後、更にそのポリウレタンフ
ォーム表面の少なくとも一つの面に、前記セラミックス
ラリーを塗布することにより、そのポリウレタンフォー
ム表面の骨格にセラミックスラリーを過剰に付着させる
、特許請求の範囲第３項記載の粉末冶金用棚板の製造方
法。(4) After impregnating the polyurethane foam from which the cell membrane has been removed with the ceramic slurry, the ceramic slurry is further applied to at least one surface of the polyurethane foam, thereby applying the ceramic slurry to the skeleton of the surface of the polyurethane foam. The method for manufacturing a shelf board for powder metallurgy according to claim 3, wherein the powder metallurgy shelf board is made to adhere excessively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22020686A JPS6376804A (en) | 1986-09-18 | 1986-09-18 | Pack for powder metallurgy and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22020686A JPS6376804A (en) | 1986-09-18 | 1986-09-18 | Pack for powder metallurgy and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6376804A true JPS6376804A (en) | 1988-04-07 |
Family
ID=16747548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22020686A Pending JPS6376804A (en) | 1986-09-18 | 1986-09-18 | Pack for powder metallurgy and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6376804A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02154982A (en) * | 1988-12-05 | 1990-06-14 | Toshiba Ceramics Co Ltd | Tool for heat treatment and manufacture thereof |
| JP2003051479A (en) * | 2001-08-03 | 2003-02-21 | Inoac Corp | Dirt wiping material and method of manufacturing the same |
-
1986
- 1986-09-18 JP JP22020686A patent/JPS6376804A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02154982A (en) * | 1988-12-05 | 1990-06-14 | Toshiba Ceramics Co Ltd | Tool for heat treatment and manufacture thereof |
| JP2003051479A (en) * | 2001-08-03 | 2003-02-21 | Inoac Corp | Dirt wiping material and method of manufacturing the same |
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