JPH04147807A - Manufacture of cylindrical silicon carbide body - Google Patents
Manufacture of cylindrical silicon carbide bodyInfo
- Publication number
- JPH04147807A JPH04147807A JP27060490A JP27060490A JPH04147807A JP H04147807 A JPH04147807 A JP H04147807A JP 27060490 A JP27060490 A JP 27060490A JP 27060490 A JP27060490 A JP 27060490A JP H04147807 A JPH04147807 A JP H04147807A
- Authority
- JP
- Japan
- Prior art keywords
- silicon carbide
- cylindrical
- cylindrical mold
- slurry
- mold
- 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
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 229910010271 silicon carbide Inorganic materials 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 239000002002 slurry Substances 0.000 claims abstract description 23
- 239000002245 particle Substances 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000011230 binding agent Substances 0.000 claims abstract description 11
- 239000002904 solvent Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 16
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000002250 absorbent Substances 0.000 claims description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 2
- 239000003208 petroleum Substances 0.000 claims description 2
- 239000010802 sludge Substances 0.000 claims 1
- 238000000465 moulding Methods 0.000 abstract description 16
- 238000001035 drying Methods 0.000 abstract description 6
- 238000003825 pressing Methods 0.000 abstract description 4
- 238000000926 separation method Methods 0.000 abstract description 4
- 238000002156 mixing Methods 0.000 abstract description 3
- 239000002270 dispersing agent Substances 0.000 abstract description 2
- -1 deflocculant Substances 0.000 abstract 1
- 229920001296 polysiloxane Polymers 0.000 abstract 1
- 239000000843 powder Substances 0.000 abstract 1
- 239000011505 plaster Substances 0.000 description 7
- 239000000919 ceramic Substances 0.000 description 5
- 239000004927 clay Substances 0.000 description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 3
- 239000011358 absorbing material Substances 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 description 3
- 239000000839 emulsion Substances 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- XJKVPKYVPCWHFO-UHFFFAOYSA-N silicon;hydrate Chemical compound O.[Si] XJKVPKYVPCWHFO-UHFFFAOYSA-N 0.000 description 2
- 238000007582 slurry-cast process Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000013256 coordination polymer Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000010111 plaster casting Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Landscapes
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は円筒状炭化珪素体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 relates to a method for manufacturing a cylindrical silicon carbide body.
本発明は、特に比較的大口径の均一な管体を必要とする
、ライナー管、ラジアント管、輸送管の製造等に利用す
ることができる。The present invention can be particularly applied to the production of liner pipes, radiant pipes, transport pipes, etc., which require uniform pipe bodies with relatively large diameters.
比較的大口径の炭化珪素管体の製造方法としては、押出
し成形法とＣＩＰ （静水圧加圧成形）成形法、泥しよ
う鋳込み成形法が知られている。Extrusion molding, CIP (hydrostatic pressing) molding, and slurry casting molding are known as methods for manufacturing relatively large-diameter silicon carbide tubes.
押出し成形法は、炭化珪素粉末、水、バインダーを混合
混練し、可塑性をもった坏土状態にし、この坏土をピス
トン式押出し機またはオーガー（真空土練機）を用いて
成形する方法である。The extrusion molding method is a method in which silicon carbide powder, water, and a binder are mixed and kneaded to form a plastic clay, and the clay is molded using a piston extruder or auger (vacuum clay kneading machine). .
ＣＩＰ成形法は、炭化珪素粉末、水、パインダ−との混
合物をゴム型の中に詰め、それを圧力容器内の液体内に
入れて液体に圧力をかけて成形する方法である。この場
合、必要によっては炭化珪素粉末をスプレードライヤー
等を用いて造粒する場合もある。The CIP molding method is a method in which a mixture of silicon carbide powder, water, and a binder is packed into a rubber mold, placed in a liquid in a pressure vessel, and molded by applying pressure to the liquid. In this case, if necessary, silicon carbide powder may be granulated using a spray dryer or the like.
泥しよう鋳込み成形法は、泥しようを石膏型内に入れて
成形する方法である。特開平１−１７９７４８号公報ｒ
セラミックス成形体の泥しよう鋳込み方法」では、懸濁
粒子が二価金属塩を含むセラミ。The plaster casting method is a method in which plaster is placed in a plaster mold. JP-A-1-179748 r
"Mud casting method for ceramic molded bodies" uses ceramics in which suspended particles contain divalent metal salts.
り粒子に解膠剤と水とを混合したセラミックス泥しよう
を吸水性モールド内に鋳込み、該モールド内面に泥しよ
うを着肉させることを特徴とするセラミックス成形体の
泥しよう鋳込み成形法が提示されている。A slurry casting method for a ceramic molded body is proposed, which is characterized in that ceramic slurry made by mixing particles of deflocculant with water is cast into a water-absorbent mold, and the slurry is deposited on the inner surface of the mold. ing.
上記従来の押出成形法は、口型の設計が難しく、肉厚も
不均一になる。それに炭化珪素は硬いため口型やオーガ
ーが摩耗しやすい。成形時に坏土を多量に必要とするた
め少量生産には向かない。成形時の圧力が低いため炭化
珪素粉末の成形後の充填が低い等の問題を有している。In the above-mentioned conventional extrusion molding method, it is difficult to design the mouth mold, and the wall thickness becomes uneven. In addition, silicon carbide is hard, so the mouth mold and auger are prone to wear. It is not suitable for small-scale production because it requires a large amount of clay during molding. Since the pressure during molding is low, there are problems such as low filling of silicon carbide powder after molding.
一方ＣＩＰ成形は高圧力で成形するため粒子の充填は高
くなり、ゴム型を用いるため摩耗等の心配は少ない。し
かし、充填時の炭化珪素粉末のむらや圧力が炭化珪素粉
末内に均一にかからないため、肉厚のむらや粒子充填の
粗密が生じる。炭化珪素粉末を造粒して用いる場合には
造粒物がＣ■Ｐ成形時につぶれないことがよくあり欠陥
を生じやすい。また、設備に多量の資金がかかり、生産
性も悪い等の問題がある。On the other hand, since CIP molding is performed under high pressure, the filling of particles is high, and since a rubber mold is used, there is less concern about wear and the like. However, since the silicon carbide powder is uneven during filling and the pressure is not applied uniformly within the silicon carbide powder, uneven thickness and uneven packing of particles occur. When silicon carbide powder is used in granules, the granules often do not collapse during CP molding, and defects are likely to occur. Further, there are problems such as a large amount of capital required for equipment and poor productivity.
特開平１−１７９７４８号公報「セラミックス成形体の
泥しよう鋳込み方法」では、吸水性モールドに石膏型を
使用するため、石膏型の精度の問題から小形状のものし
か成形できない、遠心力が３０Ｇから３００Ｇと高いた
め、大きい粒子は外側へ小さい粒子は内側へと粒径によ
る分離が起きる。そのため内側と外側で乾燥時の収縮度
が違うため乾燥時にきれつが発生する。また、バインダ
ーが水と一緒に分離するため成形体の乾燥後の強度が低
い等の問題点がある。In JP-A-1-179748, "Mud casting method for ceramic molded bodies," a plaster mold is used for the water-absorbing mold, so only small shapes can be molded due to problems with the accuracy of the plaster mold, and the centrifugal force is from 30G. Since the force is as high as 300G, separation according to particle size occurs, with large particles moving outward and small particles moving inside. Therefore, the degree of shrinkage during drying is different between the inside and outside, which causes cracks to occur during drying. Further, since the binder separates together with water, there are problems such as low strength of the molded product after drying.
本発明はこれら従来の製造方法の欠点を有しない新しい
炭化珪素の円筒形状の成形体の製造方法を提供とするこ
とを目的とする。An object of the present invention is to provide a new method for manufacturing a cylindrical molded body of silicon carbide that does not have the drawbacks of these conventional manufacturing methods.
本発明は、炭化珪素と溶媒、解膠剤、バインダーを混合
して泥しよう状態にしたものを、円筒型内に入れて円筒
型を回転させ、遠心力の作用で炭化珪素粉末を型内面に
押付けて、円筒状炭化珪素体を製造する方法において、
上記炭化珪素粉末の粒径が１２５μｍ以下であり、
Ｇ ＝ （Ｄ×ｎ２）／ １７９０００ここで、Ｇ：遠
心力、Ｄ：成形体の直径（ＣＭ）、ｎ：回転数（ｒｐ−
）で与えられる遠心力が６Ｇ〜２０Ｇであることを特徴
とする。In the present invention, silicon carbide, a solvent, a deflocculant, and a binder are mixed to form a slurry, which is put into a cylindrical mold, the cylindrical mold is rotated, and silicon carbide powder is applied to the inner surface of the mold by the action of centrifugal force. In the method of manufacturing a cylindrical silicon carbide body by pressing, the particle size of the silicon carbide powder is 125 μm or less, and G = (D×n2)/179000, where G: centrifugal force, D: diameter of the compact (CM), n: rotational speed (rp-
) is characterized by a centrifugal force of 6G to 20G.
円筒型の材質もしくは内面には吸水性の材質を用いる必
要はない、これは、遠心力により炭化珪素粉末が円筒型
内面に均一に押付けられ、水が炭化珪素粉末の内面にで
て分離するため成形体に保形性がでるためである。なお
、成形の効率を上げるだめに成形体の保形性を早くださ
せる方法として、円筒型内面に吸水性の材質を使ったり
水より蒸発の早い溶媒、アルコール、石油エーテル等を
使用すればなお良い。There is no need to use a water-absorbing material for the cylindrical material or the inner surface. This is because the silicon carbide powder is evenly pressed against the cylindrical inner surface by centrifugal force, and water comes out on the inner surface of the silicon carbide powder and separates. This is because the molded article has shape retention properties. In order to improve molding efficiency, it is even better to use a water-absorbing material for the inner surface of the cylindrical shape or to use a solvent, alcohol, petroleum ether, etc. that evaporates faster than water. good.
吸水性の材質を円筒型内面につける方法としては、あら
かじめ石膏のような自硬性のスラリー状のものを円筒型
内に流し込み回転させ、それが固まった時点で炭化珪素
泥しようを流し込む方法もある。この方法によれば、内
径面に均一な型ができるため型の精度の問題がなくなり
、より均一な炭化珪素の円筒形状が成形できる。Another way to apply a water-absorbing material to the inner surface of a cylindrical mold is to pour a self-hardening slurry such as plaster into the cylindrical mold in advance and rotate it, and once it hardens, pour in silicon carbide slurry. . According to this method, a uniform mold can be formed on the inner diameter surface, so there is no problem with the accuracy of the mold, and a more uniform cylindrical shape of silicon carbide can be molded.
本発明を図面により説明する。第１図は本発明に係る成
形装置の断面図である。まず炭化珪素粉末と分散剤とバ
インダーと水とを良く混合して調節された泥しようを作
る。そして、この泥しようを容器２から円筒型１内に流
し込み、泥しょうが円筒型の流し込み口の反対の端まで
届いたら、ローラ３により円筒型を回転させる。この時
の回転数は泥しようの粘度により多少変動するが６０〜
２０Ｇ（重力換算）である。ここで６Ｇ以下の墳合しイ
ンニングと呼ばれる現象が起き、泥しょうが円筒型内で
雨振り状に落下し、２０Ｇ以上の場合炭化珪素粉末の分
離が起きるため好ましくないまた、炭化珪素粉末の粒径
が１２５μｍ以上だと遠心力が２０Ｇ以下でも粒子の分
離による乾燥時のきれつが発生するため、炭化珪素粉末
の粒径は１２５μｍ以下でなくてはならない。粒径は小
さい方が泥しようの状態が良いので、細かければ細かい
方が良いが、価格と扱いやすさから０．１μ以上が好ま
しい。The present invention will be explained with reference to the drawings. FIG. 1 is a sectional view of a molding apparatus according to the present invention. First, a controlled slurry is prepared by thoroughly mixing silicon carbide powder, a dispersant, a binder, and water. Then, the slurry is poured from the container 2 into the cylindrical mold 1, and when the slurry reaches the end opposite to the pouring port of the cylindrical mold, the cylindrical mold is rotated by the rollers 3. The rotation speed at this time varies slightly depending on the viscosity of the slurry, but from 60 to
It is 20G (gravity equivalent). At 6G or less, a phenomenon called inning occurs, and mud falls like raindrops inside the cylindrical mold, and at 20G or more, the silicon carbide powder separates, which is undesirable. If the particle size is 125 μm or more, cracks will occur during drying due to particle separation even if the centrifugal force is 20 G or less, so the particle size of the silicon carbide powder must be 125 μm or less. The smaller the particle size, the better the slurry condition, so the smaller the particle size, the better, but from the viewpoint of cost and ease of handling, 0.1μ or more is preferable.
そして、炭化珪素泥しょうが十分に着肉したら円筒型の
回転を止め、内面に分離した水を流しだし、炭化珪素成
形体４を円筒型から外す。Then, when the silicon carbide slurry is sufficiently deposited, the rotation of the cylindrical mold is stopped, the separated water is poured out on the inner surface, and the silicon carbide molded body 4 is removed from the cylindrical mold.
以上のように大口径の均一な炭化珪素成形体が得ること
ができる。As described above, a uniform silicon carbide molded body having a large diameter can be obtained.
本発明を実施例により説明する。 The present invention will be explained by examples.
（１）炭化珪素１００重量部、水３０重量部、解膠剤と
してアンモニア水、バインダーとしてアクリル系のエマ
ルジョンを用いて泥しようを作り、遠心成形を行った。(1) A slurry was prepared using 100 parts by weight of silicon carbide, 30 parts by weight of water, ammonia water as a deflocculant, and an acrylic emulsion as a binder, and centrifugal molding was performed.
用いた円筒型は外径２４８×内径２３８×長さ３０００
ｍｌの鋼鉄製である。The cylindrical mold used was outer diameter 248 x inner diameter 238 x length 3000 mm.
Made of ml steel.
成形体は円筒型の途中に蓋を付けて長さを調節し、遠心
力２０Ｇで１２０分間行った。その結果外径２３８×内
径２２４×長さ１０００■の成形体を得た。成形体の肉
厚のば、らつきは±１．５ｍ以内であった。The length of the molded product was adjusted by attaching a lid to the middle of the cylindrical mold, and the molding was performed at a centrifugal force of 20 G for 120 minutes. As a result, a molded body having an outer diameter of 238 x inner diameter of 224 x length of 1000 cm was obtained. The wall thickness fluctuation of the molded body was within ±1.5 m.
（２）炭化珪素１００重量部、水３０重量部、解膠剤と
してアンモニア水、バインダーとしてアクリル系のエマ
ルジョンを用いて泥しようを作り、遠心成形を行った。(2) A slurry was prepared using 100 parts by weight of silicon carbide, 30 parts by weight of water, ammonia water as a deflocculant, and an acrylic emulsion as a binder, and centrifugal molding was performed.
用いた円筒型は外径２９０×内径２８０×長さ３０００
■の鋼鉄製の円筒型内に外径２８０×内径１８６×長さ
３０００■の石膏型を固定したものである。遠心力１８
Ｇで９０分間行った。その結果外径１８６×内径１７４
×長さ３０００５ｗｍの成形体を得た。成形体の肉厚の
ばらつきは±１．５閣以内であった。The cylindrical type used is outer diameter 290 x inner diameter 280 x length 3000.
A plaster mold with an outer diameter of 280 cm, an inner diameter of 186 cm, and a length of 3000 cm is fixed inside the steel cylindrical mold shown in (3). centrifugal force 18
G for 90 minutes. As a result, outer diameter 186 x inner diameter 174
A molded body having a length of 30005 wm was obtained. The variation in wall thickness of the molded bodies was within ±1.5 degrees.
また、同様な条件で炭化珪素粉末に粒径が１５０μｍ以
上を使用したものは乾燥時にきれつが発生した。Furthermore, under similar conditions, cracks occurred during drying when silicon carbide powder with a particle size of 150 μm or more was used.
（３）石膏１００重量部、水７０重量部を円筒型内に入
れ、遠心力８Ｇで１５分間回転させ円筒型内に石膏をつ
けた。その後炭化珪素１００重量部、水３０重量部、解
膠剤としてアンモニア水、バインダーとしてアクリル系
のエマルジョンを用いて泥しようを作り遠心力１８Ｇで
９０分行った。その結果外径１６６×内径１４６×長さ
１０００ｍの成形体を得た。成形体の肉厚のばらつきは
±１． Ｏ１ｌｌＩ以内であった。(3) 100 parts by weight of plaster and 70 parts by weight of water were placed in a cylindrical mold, and the mold was rotated for 15 minutes with a centrifugal force of 8 G to coat the gypsum inside the cylindrical mold. Thereafter, a slurry was made using 100 parts by weight of silicon carbide, 30 parts by weight of water, ammonia water as a deflocculant, and an acrylic emulsion as a binder, and the slurry was applied at a centrifugal force of 18 G for 90 minutes. As a result, a molded body having an outer diameter of 166 x inner diameter of 146 x length of 1000 m was obtained. The variation in wall thickness of the molded body is ±1. It was within O1llI.
〔発明の効果］
本発明の炭化珪素成形体の製造方法により、均一で大口
径の長い炭化珪素の円筒形状の成形が可能になる。それ
に、気泡等も炭化珪素成形体の内面にでるため成形体の
欠陥も無くなる。更に遠心力によって高い圧力がかかる
ため成形体は、ち密になり成形体の強度も高く焼成後の
気孔率も低くなる。[Effects of the Invention] The method for manufacturing a silicon carbide molded body of the present invention enables the molding of silicon carbide into a uniform, large-diameter, and long cylindrical shape. Moreover, since air bubbles and the like appear on the inner surface of the silicon carbide molded body, defects in the molded body are also eliminated. Furthermore, since high pressure is applied due to centrifugal force, the molded body becomes denser, has higher strength, and has a lower porosity after firing.
以上のように本発明の効果は非常に大きい。As described above, the effects of the present invention are very large.
第１図は本発明に係る成形装置の断面図である。 １・・−−−−一円筒型 ２・・・〜 容器 ３〜−−−−−一ローラ ・−炭化珪素成形体 FIG. 1 is a sectional view of a molding apparatus according to the present invention. 1.----One cylindrical type 2...~ container 3～------One roller ・-Silicon carbide molded body
Claims (3)
泥しょう状態にしたものを、円筒型内に入れて円筒型を
回転させ、遠心力の作用で炭化珪素粉末を型内面に押付
けて、円筒状炭化珪素体を製造する方法において、 上記炭化珪素粉末の粒径が１２５μｍ以下であり、 Ｇ＝（Ｄ×ｎ＾２）／１７９０００ ここで、Ｇ：遠心力、Ｄ：成形体の直径（ｃｍ）ｎ：回
転数（ｒｐｍ）で与えられる遠心力が６Ｇ〜２０Ｇであ
ることを特徴とする円筒状炭化珪素体の製造方法。(1) A mixture of silicon carbide, a solvent, a deflocculant, and a binder is put into a slurry state, and the cylindrical mold is rotated, and the silicon carbide powder is pressed against the inner surface of the mold by the action of centrifugal force. In the method for manufacturing a cylindrical silicon carbide body, the particle size of the silicon carbide powder is 125 μm or less, and G=(D×n^2)/179000, where G: centrifugal force, D: of the molded body. A method for producing a cylindrical silicon carbide body, characterized in that the centrifugal force given by diameter (cm) n: rotational speed (rpm) is 6G to 20G.
ら選ばれたものを用いた請求項第（１）項記載の円筒状
炭化珪素体の製造方法。(2) The method for producing a cylindrical silicon carbide body according to claim (1), wherein a solvent selected from water, alcohol, and petroleum ether is used as the solvent.
、円筒型を回転させ遠心力により自硬性の吸水性スラリ
ーを着肉させた後、炭化珪素粉末と、溶媒、解膠剤を混
合して泥しょう状態にしたものをその中に流し込む請求
項第（１）項記載の円筒状炭化珪素体の製造方法。(3) Pour the self-hardening water-absorbent slurry into the cylindrical mold, rotate the cylindrical mold, apply centrifugal force to the self-hardening water-absorbent slurry, and then mix the silicon carbide powder, solvent, and peptizer. The method for manufacturing a cylindrical silicon carbide body according to claim (1), wherein a slurry obtained by sludge is poured into the cylindrical silicon carbide body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2270604A JP3069963B2 (en) | 1990-10-11 | 1990-10-11 | Method for producing cylindrical silicon carbide body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2270604A JP3069963B2 (en) | 1990-10-11 | 1990-10-11 | Method for producing cylindrical silicon carbide body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04147807A true JPH04147807A (en) | 1992-05-21 |
| JP3069963B2 JP3069963B2 (en) | 2000-07-24 |
Family
ID=17488412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2270604A Expired - Fee Related JP3069963B2 (en) | 1990-10-11 | 1990-10-11 | Method for producing cylindrical silicon carbide body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3069963B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106042170A (en) * | 2016-07-20 | 2016-10-26 | 郑州开阳窑具制品有限公司 | Silicon carbide pipeline product forming machine |
-
1990
- 1990-10-11 JP JP2270604A patent/JP3069963B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106042170A (en) * | 2016-07-20 | 2016-10-26 | 郑州开阳窑具制品有限公司 | Silicon carbide pipeline product forming machine |
| CN106042170B (en) * | 2016-07-20 | 2018-07-06 | 郑州开阳窑具制品有限公司 | Silicon carbide pipeline product forming machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3069963B2 (en) | 2000-07-24 |
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| LAPS | Cancellation because of no payment of annual fees |