JPH0455358A - Pellet for injection-molding ceramic and method for dewaxing ceramic molded body - Google Patents
Pellet for injection-molding ceramic and method for dewaxing ceramic molded bodyInfo
- Publication number
- JPH0455358A JPH0455358A JP2166146A JP16614690A JPH0455358A JP H0455358 A JPH0455358 A JP H0455358A JP 2166146 A JP2166146 A JP 2166146A JP 16614690 A JP16614690 A JP 16614690A JP H0455358 A JPH0455358 A JP H0455358A
- Authority
- JP
- Japan
- Prior art keywords
- ceramic
- pellets
- injection molding
- molded body
- injection
- 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
- 239000008188 pellet Substances 0.000 title claims abstract description 36
- 239000000919 ceramic Substances 0.000 title claims abstract description 32
- 238000001746 injection moulding Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims description 9
- 239000011230 binding agent Substances 0.000 claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000005238 degreasing Methods 0.000 claims description 27
- 229920005989 resin Polymers 0.000 claims description 9
- 239000011347 resin Substances 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims 1
- 239000007924 injection Substances 0.000 claims 1
- 229910052581 Si3N4 Inorganic materials 0.000 abstract description 5
- 238000005336 cracking Methods 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 5
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 abstract description 5
- 239000004200 microcrystalline wax Substances 0.000 abstract description 3
- 235000019808 microcrystalline wax Nutrition 0.000 abstract description 3
- 230000008961 swelling Effects 0.000 abstract 2
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 10
- 238000010304 firing Methods 0.000 description 9
- 239000001993 wax Substances 0.000 description 9
- 239000012298 atmosphere Substances 0.000 description 5
- 238000000465 moulding Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 239000004014 plasticizer Substances 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 238000005245 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
- 239000000314 lubricant Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- FLKPEMZONWLCSK-UHFFFAOYSA-N diethyl phthalate Chemical compound CCOC(=O)C1=CC=CC=C1C(=O)OCC FLKPEMZONWLCSK-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000012776 electronic material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920000193 polymethacrylate Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000126 substance Substances 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、セラミック射出成形用ペレット及びそれを用
いたセラミック成形体の脱脂方法に関し、特にセラミッ
ク粉末と有機質系結合剤等の混合物からなるペレットの
品質の改善に関する。本発明は、タービンロータ等のセ
ラミックス製品、特に薄肉部及び／又は複雑形状部を有
するセラミックス製品の製造に利用される。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to pellets for ceramic injection molding and a method for degreasing ceramic molded bodies using the pellets, and particularly to pellets made of a mixture of ceramic powder and an organic binder. Regarding improvement of quality. INDUSTRIAL APPLICATION This invention is utilized for the manufacture of ceramic products, such as a turbine rotor, especially a ceramic product which has a thin part and/or a complex-shaped part.
セラミック材料は、近年、自動車部品、耐熱材料、電子
材料、機械工具等、その用途が急激に広がりつつあり、
それに伴い、製品形状も複雑化している。そのため、セ
ラミック材料を複雑な形状の成形体に精度良く、効率的
に成形する方法として、射出成形法が採用されている。In recent years, the applications of ceramic materials have been rapidly expanding, including automobile parts, heat-resistant materials, electronic materials, and mechanical tools.
Along with this, product shapes are also becoming more complex. For this reason, injection molding has been adopted as a method for efficiently and accurately molding ceramic materials into complex-shaped molded bodies.
しかし、この射出成形法では、成形後、脱脂工程、焼成
工程と工程が多く、各々の工程で種々の不良が発生する
。特に、脱脂工程は、容量比で約５０％（重量比で約３
０％）近くに当たる有機質系結合剤、可塑剤、滑剤等を
添加し、これを加熱除去するため、長時間を要し、その
ため不良も発生し易い。また、脱脂時の不良の多くは成
形時の成形体中に内在している欠陥が現れる場合が多く
、成形特如何に歪みの少ない成形体を作るかが鍵となる
。However, in this injection molding method, there are many steps such as a degreasing step and a firing step after molding, and various defects occur in each step. In particular, the degreasing process is approximately 50% by volume (approximately 3% by weight).
Since organic binders, plasticizers, lubricants, etc., which are close to 0%) are added and removed by heating, it takes a long time, and as a result, defects are likely to occur. Moreover, many of the defects during degreasing are caused by defects inherent in the molded product during molding, and the key is how to produce a molded product with as little distortion as possible during molding.
歪みのない成形体を作るためには、成形用原料（セラミ
ック粉末と有機質系結合剤の混合物）の品質を如何に管
理するかが、一番問題となる。このため、所定条件下、
加圧力が１．５、ｌ０ＭＰａのときの流量が各々０．０
２〜Ｏ，ｉ ０．１〜０．５．０．３〜１．０ｍｌ／ｓ
という混練物とする、即ち粘度管理を行うことが知られ
ている（特開昭６３−２１２５０号公報）。In order to produce a molded body without distortion, the most important issue is how to control the quality of the molding raw material (mixture of ceramic powder and organic binder). Therefore, under certain conditions,
The flow rate is 0.0 when the applied pressure is 1.5 and 10 MPa, respectively.
2~O,i 0.1~0.5.0.3~1.0ml/s
It is known to make a kneaded product, that is, to control the viscosity (Japanese Unexamined Patent Publication No. 63-21250).
しかし、粘度は、混練中のセラミック原料の種類や、有
機質系結合剤の種類によって大きく異なるので、この粘
度管理も有用とはいえない。また、これは、セラミック
粉末と有機質系結合剤の混合物の流動性のみを考慮して
おり、この混合物の品質に関して考慮されておらず、た
とえ粘度管理を行っても脱脂体の良品歩留りが低いとい
う問題があった。However, since the viscosity varies greatly depending on the type of ceramic raw material being kneaded and the type of organic binder, this viscosity control cannot be said to be useful. In addition, this only takes into account the fluidity of the mixture of ceramic powder and organic binder, and does not take into account the quality of this mixture. Even if viscosity is controlled, the yield of good degreased products is low. There was a problem.
本発明は、前記観点に鑑みてなされたものであり、脱脂
後若しくは焼成後の良品歩留りを向上させる高品質の射
出成形用ペレット及び脱脂後の良品歩留りを向上させる
脱脂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 aims to provide high-quality injection molding pellets that improve the yield of good products after degreasing or firing, and a degreasing method that improves the yield of good products after degreasing. shall be.
本第１発明の射出成形用ペレットは、射出成形に用いら
れるときの、セラミック粉末及び有機質系結合剤を含む
ペレットに含有される水分量を８００ｐｐｍ以下に管理
することを特徴とする。The injection molding pellet of the first invention is characterized in that the amount of water contained in the pellet containing ceramic powder and an organic binder is controlled to 800 ppm or less when used for injection molding.
ここで、ペレットとは、射出成形に用いられるためのも
のであり、その形状、大きさ等は問わず、適当な大きさ
の小片に成形又は裁断等されたものである。Here, the pellet is used for injection molding, and is molded or cut into small pieces of an appropriate size, regardless of its shape and size.
前記有機質系結合剤の種類、その種類数、添加量等は目
的、用途により種々選択される。即ち、その種類として
、（１）パラフィンワックス、マイクロクリスタリンワ
ックス、各種の脂肪酸をグリセリン等でエステル化した
低級合成ワックス類、ポリエチレン、ポリスチレン等の
高級合成ワックス等のワックス類（以上を、含めてこの
ように表現する。）、（２＞ポリエチレン、ポリプロピ
レン、ポリスチレン、ポリメタアクリレート等の樹脂を
用いることができる。The type of organic binder, the number of types thereof, the amount added, etc. are variously selected depending on the purpose and use. That is, the types include (1) waxes such as paraffin wax, microcrystalline wax, lower synthetic waxes made by esterifying various fatty acids with glycerin, etc., and higher synthetic waxes such as polyethylene and polystyrene (including the above); ), (2>Resins such as polyethylene, polypropylene, polystyrene, polymethacrylate, etc. can be used.
また、このワックス類のみ又は樹脂のみを用いることも
できるが、通常、水軍２．４発明に示すように、ワック
ス類と樹脂の混合物を用いる。このように、ワックス類
と樹脂の混合とするのは、セラミック粒子の分散を良く
すること、適度な流動性を確保すること等のためである
。また、前記ワックス類の各種化合物のうちの１種若し
くは２種以上、又は前記樹脂のうちの１種若しくは又は
２種以上を用いることもできる。尚、通常、前記ワック
ス類（１）の分子量は３００〜１０，０００、前記樹脂
（２）の分子量は１０．０００以上である。Further, although it is possible to use only these waxes or only resins, a mixture of waxes and resins is usually used as shown in Suigun 2.4 invention. The reason for mixing wax and resin in this manner is to improve the dispersion of ceramic particles and ensure appropriate fluidity. Furthermore, one or more of the various compounds of the waxes, or one or more of the resins mentioned above can also be used. Incidentally, the molecular weight of the wax (1) is usually 300 to 10,000, and the molecular weight of the resin (2) is usually 10.000 or more.
前記水分量は８００ｐｐｍ以下である。これが８００ｐ
ｐｍを越えると、脱脂後の脱脂体の内部又は表面にキレ
が多く発生し、良品歩留りが低下するためである。尚、
この水分量は、ペレットの表面のみならずその内部に含
まれるものも含む。The moisture content is 800 ppm or less. This is 800p
This is because if it exceeds pm, many cracks will occur inside or on the surface of the degreased body after degreasing, and the yield of good products will decrease. still,
This water content includes not only the surface of the pellet but also the water contained inside the pellet.
−船釣に混線直後は、この混線が加熱によるため水分量
が１００ｐ１００ｐｐ下と少ないが、ペレッＦにし、放
置することにより大気中の水分を吸着し、全水分量が増
大する。従って、ペレットの保管は、乾煙器中が好まし
い。この場合、加熱乾燥させることもできるが、低温で
乾燥可能な脱湿型ホッパドライ中に、ペレットを保管す
るのが好ましい。即ち、この組成物には、通常、低融点
の有機質系結合剤（ワックス等）、更には可塑剤等が含
まれるため、例えば５０℃以上の温度にて加熱乾燥する
とペレット中の低融点化合物が滲み出してきて、物性の
変化を生じる場合があるからである。また、大気中に放
置して吸湿したペレットは、再度加熱混練を行い水分を
揮発させるのが好ましい。- Immediately after a line is mixed with a fishing boat, the water content is as low as 100 pp or less because the line is heated, but by using Pellet F and leaving it for a while, it adsorbs moisture in the atmosphere and increases the total water content. Therefore, it is preferable to store the pellets in a dry smoke oven. In this case, the pellets can be dried by heating, but it is preferable to store the pellets in a dehumidifying hopper dryer that can be dried at low temperatures. That is, since this composition usually contains a low melting point organic binder (wax, etc.) and a plasticizer, etc., the low melting point compounds in the pellets are removed by heating and drying at a temperature of 50°C or higher, for example. This is because it may ooze out and cause changes in physical properties. Further, it is preferable that pellets that have been left in the atmosphere to absorb moisture are heated and kneaded again to volatilize the moisture.
更に、本射出成形用ペレットにおいて、使用するセラミ
ック粉末の種類（例えば、窒化珪素粉末、アルミナ粉末
等）、その配合量は種々選択する。また、焼結助剤は使
用するセラミック粉末等により種々選択される。更に、
本組成物には、他に可塑剤、滑剤等を配合することもで
きる。Furthermore, in the present injection molding pellet, the type of ceramic powder used (for example, silicon nitride powder, alumina powder, etc.) and its blending amount are variously selected. Further, various sintering aids are selected depending on the ceramic powder used. Furthermore,
The present composition may also contain other plasticizers, lubricants, etc.
本第３発明のセラミック成形体の脱脂方法は、前記第１
発明の射出成形用射出成形用ペレットを用いて射出成形
し、その後、加熱して脱脂することを特徴とする。この
脱脂条件例えば、脱脂温度、脱脂時間、脱脂雰囲気等は
、目的、用途により種々選択する。The method for degreasing a ceramic molded body according to the third aspect of the present invention comprises:
It is characterized by injection molding using the injection molding pellets of the invention and then heating and degreasing. The degreasing conditions, such as the degreasing temperature, degreasing time, degreasing atmosphere, etc., are variously selected depending on the purpose and use.
所定の水分量をもつ射出成形用ペレットを用いて射出成
形する時、加熱溶融された混線物が、金型キャビティ内
へ流入される。この時、この水分は、急激な圧力開放に
よりガス化し、成形体内に取り込まれるので、この成形
体を脱脂する時、脱脂体にワレや膨れが生じる原因にな
る。When injection molding pellets having a predetermined moisture content are used for injection molding, a heated and melted contaminant flows into the mold cavity. At this time, this moisture is gasified by the sudden pressure release and taken into the molded body, which causes cracks and blisters to occur in the degreased body when the molded body is degreased.
本射出成形用ペレット中に含まれる水分は８００ｐｐｍ
以下と少ないので、脱脂時の脱脂体のワレや膨れが少な
く、脱脂歩留りを向上させることができる。そして、こ
の水分管理をすることにより、脱脂歩留りを管理するこ
とができる。The moisture content in this injection molding pellet is 800 ppm.
Since the amount is less than 100%, the degreased body is less prone to cracking or blistering during degreasing, and the degreasing yield can be improved. By controlling this moisture content, the degreasing yield can be controlled.
［実施例〕 以下、実施例により本発明を具体的に説明する。[Example〕 Hereinafter, the present invention will be specifically explained with reference to Examples.
まず、平均粒径１μｍの窒化珪素粉末１００重量部（以
下、単に部という。）に対し、焼結助剤としてアルミナ
（平均粒径的１μｍ ） ５ ｎ ｓイツトリア（平
均粒径的１μｍ）５部を添加し、焼結用窒化珪素混合物
を調製した。この混合物に有機質系結合剤として、エチ
レン−酢酸ビニル共重合樹脂５部、マイクロクリスタリ
ンワックス１５部、可塑剤としてジエチルフタレート４
部を加えて加熱混練し、その後、ペレタイザーによりペ
レット化し射出成形用ペレットを作製した。First, to 100 parts by weight (hereinafter simply referred to as parts) of silicon nitride powder with an average particle size of 1 μm, 5 parts of alumina (average particle size of 1 μm) and 5 parts of alumina (average particle size of 1 μm) were added as a sintering aid. was added to prepare a silicon nitride mixture for sintering. This mixture contains 5 parts of ethylene-vinyl acetate copolymer resin as an organic binder, 15 parts of microcrystalline wax, and 4 parts of diethyl phthalate as a plasticizer.
The mixture was heated and kneaded, and then pelletized using a pelletizer to produce pellets for injection molding.
次いで、このペレット中の水分含有量を、カールフィッ
シャー式水分測定機により水分含有量を測定した所、８
０ｐｐｍであった。尚、この方法によれば、表面に吸着
された水分のみならずその内部に含まれる水分をも測定
される。Next, the moisture content in this pellet was measured using a Karl Fischer moisture meter, and it was found to be 8.
It was 0 ppm. Note that, according to this method, not only the moisture adsorbed on the surface but also the moisture contained inside the surface can be measured.
このペレットを大気中、２日及び１週間放置した後、水
分を測定した所、各々３００ｐｐｍ及び１１０００ｐｐ
に増加した。また、加湿雰囲気中にペレットを放置し、
水分量が各々、２００．６００．７５０．８５０．１１
０５０ｐｐの各ペレットを作成した。以上の結果をまと
めて表に示した。After leaving the pellets in the air for 2 days and 1 week, the moisture content was 300 ppm and 11000 ppm, respectively.
increased to Also, leave the pellets in a humidified atmosphere,
The water content is 200.600.750.850.11 respectively.
Each pellet of 0.050 pp was made. The above results are summarized in the table.
以上の所定の水分量をもつ各ペレットを用い、ラジアル
型タービンロータをうるようにｇ＊された金型を用いて
、射出成形により所定のラジアル型タービンロータ用成
形体を各２０個成形した。Using each of the pellets having the above-mentioned predetermined water content, 20 predetermined molded bodies for radial-type turbine rotors were molded by injection molding using a mold that was made g* to absorb the radial-type turbine rotor.
尚、この成形体において、焼成後の翼部の最大直径は５
０ｍｍ、焼成後の最薄′内部の肉厚は約１ｍｍである。In addition, in this molded body, the maximum diameter of the wing part after firing is 5
0 mm, and the inner wall thickness of the thinnest part after firing is approximately 1 mm.
次いで、前記各成形体を熱風循環式の電気炉中１００℃
から５００℃まで１０℃／時間で窒素雰囲気下で加熱し
脱脂した。Next, each of the molded bodies was placed in a hot air circulating electric furnace at 100°C.
to 500°C at a rate of 10°C/hour under a nitrogen atmosphere to degrease.
（この行、余白）
この各脱脂体について、キレの発生等ついて観察し、そ
の結果を表及び図に示した。尚、表中、「キレ発生」と
は脱脂体表面の拡大鏡検査及び脱脂体内部の超音波検査
において、キレが発見された場合をいう。「良好」とは
、このいずれのキレも発見されない場合をいう。(This row, blank space) Each of the defatted bodies was observed for occurrence of cracking, etc., and the results are shown in the table and figure. Incidentally, in the table, "occurrence of cracking" refers to a case where a crack is found in a magnifying glass inspection of the surface of the degreased body and an ultrasonic examination of the inside of the degreased body. "Good" refers to the case where none of these sharpness is found.
「脱脂不良数」における「不良」とは、前記「良好」以
外の場合をいい、内部又は表面にキレが発見された場合
をいう。"Defective" in "Number of degreasing failures" refers to cases other than the above-mentioned "good" and refers to cases where cracks are found inside or on the surface.
この結果によれば、表及び図に示すように、水分量が少
ない程良い結果を示し、６００ｐｐｍｊｌ下では不良率
が０％であり、７５０ｐｐｍでは１５％である。一方、
８５０ｐｐｍ以上では６０％以上と著しく大きくなる。According to the results, as shown in the table and figure, the lower the water content, the better the results, with the defective rate being 0% at 600 ppmjl and 15% at 750 ppm. on the other hand,
At 850 ppm or more, it increases significantly to 60% or more.
更に、前記７５０ｐｐｍ以下の水分量を示す脱脂体を、
窒素雰囲気中１７５０℃で２時間の焼成条件下で焼成し
て、各窒化珪素焼結体を製造した。このいずれの焼結体
も、クラック及び破損もなく良好なものであった。Furthermore, the degreased body exhibiting a water content of 750 ppm or less,
Each silicon nitride sintered body was manufactured by firing in a nitrogen atmosphere at 1750° C. for 2 hours. All of these sintered bodies were in good condition with no cracks or damage.
尚、本発明においては、前記具体的実施例に示ずものに
限られず、目的、用途に応じて本発明の範囲内で種々変
更した実施例とすることができる。即ち、成形体用セラ
ミック粒子の材質としては、前記以外の材質からなるも
のでもよいし、有機質系結合剤若しくは焼結助剤も前記
以外の種類、添加量等とすることができる。また、他に
有機質系可塑剤、滑剤、その他の各種添加剤等を用いる
こともできる。更に、脱脂の後に行われる焼成条件（焼
成温度、焼成時間、焼成雰囲気の種類等）も使用材料等
により種々選択される。It should be noted that the present invention is not limited to what is shown in the specific embodiments described above, and may be modified in various ways within the scope of the present invention depending on the purpose and application. That is, the ceramic particles for the molded body may be made of a material other than those mentioned above, and the organic binder or sintering aid may be of a type and in an amount other than those mentioned above. In addition, organic plasticizers, lubricants, and other various additives can also be used. Furthermore, various firing conditions (firing temperature, firing time, type of firing atmosphere, etc.) to be carried out after degreasing are selected depending on the materials used and the like.
また、混線物の粘度と使用ペレットの含有水分量との関
係を調べたところ、水分濃度の低下に伴って、粘度も低
下することが判った。従って、この水分量管理をするこ
とにより、粘度管理も可能となる。Furthermore, when the relationship between the viscosity of the mixed material and the moisture content of the pellets used was investigated, it was found that the viscosity also decreased as the moisture concentration decreased. Therefore, by controlling the water content, it is also possible to control the viscosity.
更に、前記セラミック粉末の代わりに、金属粉末を用い
て、同様に含有水分量を少なくすることにより、脱脂歩
幀りを向上させることができる。Furthermore, by using metal powder instead of the ceramic powder and similarly reducing the water content, the degreasing rate can be improved.
本セラミック射出成形用ベレットを用いて射出成形し脱
脂すると、前君己作用に示すように、脱脂時の脱脂体の
ワレや膨れが少なく、脱脂歩留りを向上させることがで
る。そして、この水分管理をすることにより、脱脂歩留
りを管理することができる。更に、この水分量管理をす
ることにより、混線物の粘度管理をすることもできるの
で、製造上、大変有用である。When the present ceramic injection molding pellet is used for injection molding and degreasing, the degreased body is less likely to crack or bulge during degreasing, and the degreasing yield can be improved, as shown in the previous example. By controlling this moisture content, the degreasing yield can be controlled. Furthermore, by controlling the water content, the viscosity of the mixed substance can be controlled, which is very useful in manufacturing.
図は実施例において水分量と脱脂不良率の関係を示すグ
ラフである。
特許出願人 日本特殊陶業株式会社
代 理 人 弁理士 小島ｌｈ路
ベレットの含丸敬盆ｉ（ｐｐｍ’）The figure is a graph showing the relationship between moisture content and degreasing failure rate in Examples. Patent applicant: NGK SPARK PLUG Co., Ltd. Representative: Patent attorney: Kojima Lh Road Berrett's inclusion round Keibon i (ppm')
Claims (4)
ック射出成形用ペレットにおいて、射出成形に用いられ
るときの該ペレットに含有される水分量は８００ｐｐｍ
以下であることを特徴とするセラミック射出成形用ペレ
ット。(1) In ceramic injection molding pellets containing ceramic powder and an organic binder, the moisture content in the pellets when used for injection molding is 800 ppm.
A ceramic injection molding pellet characterized by:
１０，０００以上の樹脂からなる請求項１記載のセラミ
ック射出成形用ペレット。(2) The ceramic injection molding pellet according to claim 1, wherein the organic binder comprises a wax and a resin having a molecular weight of 10,000 or more.
される水分量が８００ｐｐｍ以下であるセラミック射出
成形用ペレットを用いて射出成形し、その後、射出成形
されたセラミック成形体を加熱して脱脂することを特徴
とするセラミック成形体の脱脂方法。(3) Injection molding is performed using ceramic injection molding pellets that contain ceramic powder and an organic binder and have a water content of 800 ppm or less, and then the injection molded ceramic molded body is heated and degreased. A method for degreasing a ceramic molded body, characterized by:
１０，０００以上の樹脂からなる請求項３記載のセラミ
ック成形体の脱脂方法。(4) The method for degreasing a ceramic molded body according to claim 3, wherein the organic binder comprises a wax and a resin having a molecular weight of 10,000 or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2166146A JP2777673B2 (en) | 1990-06-25 | 1990-06-25 | Degreasing method of ceramic molded body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2166146A JP2777673B2 (en) | 1990-06-25 | 1990-06-25 | Degreasing method of ceramic molded body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0455358A true JPH0455358A (en) | 1992-02-24 |
| JP2777673B2 JP2777673B2 (en) | 1998-07-23 |
Family
ID=15825908
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2166146A Expired - Fee Related JP2777673B2 (en) | 1990-06-25 | 1990-06-25 | Degreasing method of ceramic molded body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2777673B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014122145A (en) * | 2012-12-21 | 2014-07-03 | Tdk Corp | Method for manufacturing sintered body |
-
1990
- 1990-06-25 JP JP2166146A patent/JP2777673B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014122145A (en) * | 2012-12-21 | 2014-07-03 | Tdk Corp | Method for manufacturing sintered body |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2777673B2 (en) | 1998-07-23 |
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