JPH04187558A - Binder for injection molding of ceramic and production of sintered ceramic using the same - Google Patents
Binder for injection molding of ceramic and production of sintered ceramic using the sameInfo
- Publication number
- JPH04187558A JPH04187558A JP2319269A JP31926990A JPH04187558A JP H04187558 A JPH04187558 A JP H04187558A JP 2319269 A JP2319269 A JP 2319269A JP 31926990 A JP31926990 A JP 31926990A JP H04187558 A JPH04187558 A JP H04187558A
- Authority
- JP
- Japan
- Prior art keywords
- ceramic
- component
- injection molding
- degreasing
- organic binder
- 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 44
- 239000011230 binding agent Substances 0.000 title claims abstract description 38
- 238000001746 injection moulding Methods 0.000 title claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 238000005238 degreasing Methods 0.000 claims abstract description 38
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 16
- 239000012188 paraffin wax Substances 0.000 claims abstract description 12
- 238000010304 firing Methods 0.000 claims description 5
- 125000004432 carbon atom Chemical group C* 0.000 claims 1
- 238000000465 moulding Methods 0.000 abstract description 6
- 229910052581 Si3N4 Inorganic materials 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 239000012299 nitrogen atmosphere Substances 0.000 abstract description 3
- 238000002156 mixing Methods 0.000 abstract description 2
- 239000012298 atmosphere Substances 0.000 abstract 1
- 229910010293 ceramic material Inorganic materials 0.000 abstract 1
- 238000000034 method Methods 0.000 description 23
- 238000002347 injection Methods 0.000 description 10
- 239000007924 injection Substances 0.000 description 10
- 239000000203 mixture Substances 0.000 description 7
- 238000004817 gas chromatography Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000002290 gas chromatography-mass spectrometry Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000002706 hydrostatic effect Effects 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- 239000001993 wax Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000462 isostatic pressing Methods 0.000 description 1
- 238000004949 mass spectrometry Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000003825 pressing Methods 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
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
Abstract
Description
本発明はセラミック射出成形用バインダーに関し、より
詳しくはセラミック射出成形体の脱脂工程が短縮でき、
且つ脱脂歩留が向上するセラミック射出成形用バインダ
ーに関する。更に、前記射出成形用バイングーを用いた
セラミック焼結体の製造方法に関する。The present invention relates to a binder for ceramic injection molding, and more specifically, it can shorten the degreasing process of ceramic injection molded bodies, and
The present invention also relates to a binder for ceramic injection molding that improves the degreasing yield. Furthermore, the present invention relates to a method of manufacturing a ceramic sintered body using the injection molding baingu.
複雑な形状のセラミックターボチャージャーロタやセラ
ミックタービンロータ等を射出成形、流し込み成形によ
り成形する場合は、成形性を高めるため原料セラミック
粉末に熱可塑性樹脂やワックス等の有機バインダーを添
加してセラミック成形体を形成していた。
しかし、有機バインダーを用いた場合は焼成後の焼結体
の疎密化を防止するため、成形体中に含有された有機バ
インダーを、有機溶媒を用いる溶解除去や加熱による分
解除去ムニより添加した有機バインダーを成形体中から
焼結前にして予め除去する脱脂工程が必要である。
加熱による脱脂は、有機バインダーを熱分解してガス化
させ除去させる方法であるが、有機ハインダーとセラミ
ックスの熱膨張係数の差及びバインダーの熱分解時に生
しるガスや反応熱により、成形体中に応力が発生するた
め成形体の変形やクラックの原因となっている。特に、
肉厚成形体やターボチャージャーロータ等の複雑形状品
では、脱脂による変形やクラックの発生が顕著であり、
脱脂のための昇温加熱を非常にゆっくりと、例えば２０
〜３０日間かけて行わねばならなず、これらのセラミッ
ク製品の製造工程で問題となっていた。
発明者等は、先に特開平２−１３７７７３号公報にてパ
ラフィンワックスを主成分とする有機バインダーを使用
したセラミック成形体の脱脂方法を提案した。この方法
は、パラフィンワックスの液化によりセラミック成形体
が収縮を始める直前の温度において成形体を所定時間保
持することにより、従来より短時間で脱脂して成形体の
クランク等を防止することができ有用である。When molding complex-shaped ceramic turbocharger rotors, ceramic turbine rotors, etc. by injection molding or pour molding, an organic binder such as thermoplastic resin or wax is added to the raw ceramic powder to improve molding properties. was forming. However, when an organic binder is used, in order to prevent the sintered body from becoming densified after firing, the organic binder contained in the compact can be removed by dissolving it using an organic solvent or decomposing it by heating. A degreasing step is required to remove the binder from the molded body before sintering. Degreasing by heating is a method of thermally decomposing the organic binder to gasify it and remove it, but due to the difference in thermal expansion coefficient between the organic binder and ceramics and the gas and reaction heat generated during the thermal decomposition of the binder, the inside of the molded body may be removed. This generates stress, which causes deformation and cracks in the molded product. especially,
Products with complex shapes such as thick molded bodies and turbocharger rotors are prone to deformation and cracking due to degreasing.
Raise the temperature for degreasing very slowly, e.g.
This process had to be carried out over a period of ~30 days, which caused problems in the manufacturing process of these ceramic products. The inventors previously proposed a method for degreasing a ceramic molded body using an organic binder containing paraffin wax as a main component in JP-A-2-137773. This method is useful because it holds the ceramic molded body for a predetermined period of time at a temperature just before the ceramic molded body begins to shrink due to the liquefaction of the paraffin wax, allowing it to be degreased in a shorter time than conventional methods and prevent the molded body from cranking. It is.
しかし、上記提案の方法においても、従来に比し短縮さ
れたといえ、セラミックターボチャージャーロータ等の
複雑形状品の脱脂時間は、なおｌＯ〜２０日間を要し、
より短時間への改良が望まれていた。
更にまた、上記提案方法で得られる焼結体の中に、形状
、強度等所定の特性を有しないものが生ずることがあっ
た。
発明者等の知見によれば、上記の提案方法の場合を含め
、従来の脱脂方法で得られる成形脱脂体の中には、その
表面に深さ数１０μｍのマイクロクランクが生じている
ものがあり、そのマイクロクラックが焼結後も残存して
焼結体特性に悪影響を及ぼすことが明らかになった。
そのため、上記提案の脱脂によるクノラク防止の点で優
れる方法において、得られる成形脱脂体について表面を
観察しマイクロクラ・ツクが存在しているものについて
は、その表面を修正する操作を加えて行う必要があった
。しかし、表面観察、修正による形状変化、修正作業中
に生ずる品質低下等々表面修正に伴う作業の煩雑やコス
ト・アップ等の不都合が問題となっている。
発明者等は、更に、複雑形状や大型のセラミ・ツク射出
成形体の脱脂工程において、上記知見のマイクロクラッ
クの発生を抑制し、且つ脱脂時間の短縮を目的にして、
セラミック焼結体の製造における各工程について、特に
、射出成形時のバインダーについて鋭意検討した結果、
本発明を完成した。However, even with the method proposed above, although it can be said to be shortened compared to the conventional method, the degreasing time for products with complex shapes such as ceramic turbocharger rotors still requires 10 to 20 days.
Improvements to shorter times were desired. Furthermore, some of the sintered bodies obtained by the proposed method do not have predetermined properties such as shape and strength. According to the findings of the inventors, some molded degreased bodies obtained by conventional degreasing methods, including the case of the proposed method described above, have microcranks several tens of μm deep on their surfaces. It has become clear that the microcracks remain even after sintering and have an adverse effect on the properties of the sintered body. Therefore, in the method proposed above which is excellent in terms of preventing cracks by degreasing, it is necessary to observe the surface of the resulting molded degreased body and if there are any microcracks, it is necessary to perform an additional operation to correct the surface. was there. However, problems such as surface observation, changes in shape due to correction, and quality deterioration that occur during the correction work, such as the complexity of surface correction operations and increased cost, have become problems. The inventors further aimed to suppress the occurrence of microcracks based on the above findings and shorten the degreasing time in the degreasing process of complex-shaped or large ceramic injection molded bodies.
As a result of intensive study on each process in the production of ceramic sintered bodies, especially on the binder during injection molding,
The invention has been completed.
本発明によれば、セラミック射出成形用の有機バインダ
ーであって、主成分として炭素数ＣＩ８〜Ｃ３Ｓのパラ
フィンを有し、炭素数０２．〜Ｃ２７成分が最大含有率
を示し、炭素数０３１成分がＣ３０成分より多く炭素数
Ｃ’Ｊ３成分がＣ８２成分より多いことを特徴とするセ
ラミック射出成形用バインダーが提供される。
更にまた、上記のセラミック射出成形用バインダーとセ
ラミックスとを体積比４０／６０〜５５／４５で混合し
たセラミック成形用原料を用い、射出成形工程、脱脂工
程及び焼成工程からなることを特徴とするセラミック焼
結体の製造方法が提供される。
発明者等は、前記したようにセラミ・ツク射出成形体の
脱脂工程における脱脂成形体表面のマイクロクラックの
発生の抑制等を目的に、各種の組成の有機バインダーを
用いて射出成形体の脱脂を実験検討した。その結果、特
定成分比のワ・ノクス状のパラフィン混合物を有機バイ
ンダーとして用Ｇ）だ場合、脱脂工程時間が短縮され、
且つマイクロクラックの発生も極めて少ないことを更に
知見したものである。
以下、本発明について詳しく説明する。
本発明の有機バインダー１． ＯＯｇをクロロホルム５
０ｍ１に溶解してガスクロマトグラフィ（ＧＣ）？こて
分析し、更にガスクロマド−マススペクトル（ＧＣ−Ｍ
Ｓ）にて分析し、ＧＣで検出されたピークをマススペク
トルにより定性的に同定した。この結果を第１図に示し
た。
更にまた、ＧＣの結果を相対面積法にて各ピーク成分の
組成割合を検出した。この結果を第１表に示した。
なお、ここで用いたＧＣは、■品性製作所製のＧＣＴＡ
Ｇ型ＧＣであり、ＧＣ−ＭＳは、日本電子■製ＪＭＳＤ
−３００型ＧＣ−ＭＳである。
（以下、余白）
第 １ 表
上記で得られた結果から明らかなように、本発明のセラ
ミック射出成形用の有機バインダーは、炭素数０１ｅ−
Ｃ３５のパラフィンを主成分とするも−ので、これらの
うち最大含有率を有する成分が炭素数Ｃ２３〜Ｃ２７に
存在するものである。
このような性状組成のパラフィンは、一般に、第１表に
成分組成比を示したＪＩＳ 規格 Ｋ２２３５−１９
８０に規定されるパラフィンワックスにおける融点５１
．７ ”Ｃ以上５４．４°Ｃ未満である種類１２５Ｐ４
こ分類されるパラフィンにほぼ相当するものである。し
かしながら、種類１２５Ｐのパラフィンワックスが、炭
素数０３２成分が炭素数Ｃ３０成分に比して少なく、ま
た炭素数Ｃ３３成分が炭素数０３２成分に比して少ない
のに対し、本発明の有機バインダーは、炭素数Ｃ３０成
分及び炭素数Ｃ’＋３成分がそれぞれ炭素数Ｃ３０成分
及び炭素数Ｃ３２成分より多く含有され、Ｃｆｆ１成分
／ ＣＳ。成分比及びＣ３３成分／ Ｃ３２成分比が約
１．１〜９．０の範囲にある。
本発明のセラミック焼結体の製造方法において、上記の
射出成形用バインダーを、セラミック原料粉末に対し体
積比で４０／６０〜５５ ／ ４５で混合してセラミッ
ク成形用原料を調製して用いることができる。バインダ
ーとセラミック原料との体積比が４０／６０より低い場
合は均一な混練物を得ることが難しく、また、５５／４
５を超えると脱脂性が悪化するため好ましくない。
上記のようムこして調製したセラミック射出成形用原料
は、従来法と同様にして射出成形することができる。得
られた射出成形体は、次いで脱脂する。
本発明の脱脂工程は、通常、昇温速度は特に制限される
ことなく、最高温度４００〜６００ ”Ｃで２〜１５時
間、好ましくは、４５０〜５００ ’Ｃで５〜］０時間
保持して行うことができる。
従って、本発明の有機バインダーを用いて調製したセラ
ミック射出成形用原料を用いて射出成形した射出成形体
は、先に提藁したパラフィンワックス系の有機バインダ
ーを用いた射出成形体の脱脂が、所定の昇温速度での昇
温や所定温度で所定時間保持等煩雑な脱脂スケジュール
で操作する必要があったに比し、極めて簡単な操作で脱
脂することができる。
本発明の脱脂工程においては、射出成形体にヒビや割れ
等を生ずることなく、歩留約９８％以上の高効率で脱脂
することができ、また得られる脱脂成形体の表面にはマ
イクロクラ・ツクの発生も殆どない。
本発明において、脱脂成形体は静水圧プレス後、通常の
セラミック焼成スケジュール、例えば、窒化珪素焼結体
では窒素雰囲気中、常圧下で１５５０〜１８００°Ｃ１
加圧下で１７００〜２０００°Ｃで、また炭化珪素焼結
体ではアルゴン雰囲気中、常圧下１９００〜２２００°
Ｃで焼成すればよく、セラミック原料の種類、焼結体の
使用目的等により選択する二とができる。According to the present invention, there is provided an organic binder for ceramic injection molding, which contains paraffin having a carbon number of CI8 to C3S as a main component, and has a carbon number of 02. - A binder for ceramic injection molding is provided, characterized in that the C27 component shows the maximum content, the carbon number 031 component is more than the C30 component, and the carbon number C'J3 component is more than the C82 component. Furthermore, a ceramic comprising an injection molding process, a degreasing process, and a firing process using a ceramic molding raw material obtained by mixing the above-mentioned binder for ceramic injection molding and ceramics in a volume ratio of 40/60 to 55/45. A method of manufacturing a sintered body is provided. As mentioned above, the inventors degreased injection molded bodies using organic binders of various compositions for the purpose of suppressing the occurrence of microcracks on the surface of the degreased molded body during the degreasing process of ceramic injection molded bodies. Experiments were conducted. As a result, when a wax-like paraffin mixture with a specific component ratio is used as an organic binder, the degreasing process time is shortened.
Furthermore, it has been found that the occurrence of microcracks is extremely small. The present invention will be explained in detail below. Organic binder of the present invention 1. OOg in chloroform 5
Dissolve in 0ml and perform gas chromatography (GC)? Trowel analysis and further gas chromatography mass spectrometry (GC-M
S), and the peaks detected by GC were qualitatively identified by mass spectrometry. The results are shown in FIG. Furthermore, the composition ratio of each peak component was detected using the relative area method based on the GC results. The results are shown in Table 1. The GC used here is GCTA manufactured by Kansei Seisakusho.
It is a G-type GC, and the GC-MS is JMSD manufactured by JEOL.
-300 type GC-MS. (Hereinafter, blank space) Table 1 As is clear from the results obtained above, the organic binder for ceramic injection molding of the present invention has a carbon number of 01e-
Since the main component is C35 paraffin, the component having the maximum content is present in carbon numbers C23 to C27. Paraffins with such properties and compositions are generally compliant with JIS standard K2235-19 whose component composition ratios are shown in Table 1.
Melting point 51 in paraffin wax defined in 80
．． Type 125P4 which is 7”C or more and less than 54.4°C
This is roughly equivalent to the paraffin classified in this category. However, while the type 125P paraffin wax has less carbon number components than C30 components and less carbon number components than C32 components, the organic binder of the present invention has The carbon number C30 component and the carbon number C'+3 component are contained in a larger amount than the carbon number C30 component and the carbon number C32 component, respectively, and the Cff1 component/CS. The component ratio and the C33 component/C32 component ratio are in the range of about 1.1 to 9.0. In the method for producing a ceramic sintered body of the present invention, the above injection molding binder may be mixed with the ceramic raw material powder at a volume ratio of 40/60 to 55/45 to prepare a ceramic molding raw material. can. If the volume ratio of binder and ceramic raw material is lower than 40/60, it is difficult to obtain a uniform kneaded product;
If it exceeds 5, degreasing properties will deteriorate, which is not preferable. The raw material for ceramic injection molding prepared as described above can be injection molded in the same manner as in the conventional method. The injection molded article obtained is then degreased. In the degreasing process of the present invention, the heating rate is usually not particularly limited, and the temperature is maintained at a maximum temperature of 400 to 600'C for 2 to 15 hours, preferably at 450 to 500'C for 5 to 0 hours. Therefore, an injection molded article made by injection molding using a raw material for ceramic injection molding prepared using the organic binder of the present invention is different from an injection molded article made using the paraffin wax-based organic binder as described above. In contrast to the case where degreasing of the present invention required complicated degreasing schedules such as raising the temperature at a predetermined rate and holding the temperature at a predetermined time for a predetermined time, degreasing can be performed with an extremely simple operation. In the degreasing process, it is possible to degrease with high efficiency with a yield of approximately 98% or more without causing cracks or cracks in the injection molded product, and there is no occurrence of microcracks on the surface of the resulting degreased molded product. In the present invention, after isostatic pressing, the degreased molded body is heated under a normal ceramic firing schedule, for example, in the case of a silicon nitride sintered body, the temperature is 1550 to 1800°C under normal pressure in a nitrogen atmosphere.
At 1700-2000°C under pressure, and at 1900-2200°C under normal pressure in an argon atmosphere for silicon carbide sintered bodies.
It is sufficient to sinter the sintered body with C, and the two methods can be selected depending on the type of ceramic raw material, the purpose of use of the sintered body, etc.
以下、本発明を実施例により詳細に説明する。
但し、本発明は下記実施例により制限されるものでない
。
実施例１
焼結助剤を添加した窒化珪素（５ｉＪ４）粉末と第１表
に示した組成比を有し、且つ第２表に示した各性状を有
する有機バインダーとを体積比で５゜１５０となるよう
に混合し、更に連続混練押出機にで混練して射出成形用
原料をペレット状で得た。
（以下、余白）
第２表
射出成形は名機製作所株製ｒＭ−２００Ａ−ＰＭ」射出
成形機を用い、上記のようにして得たペレット状射出成
形用原料をその成形金型に充填して、金型温度４０゛Ｃ
１材料温度７０″Ｃで翼径７５■φのターボチャージャ
ーロータに成形した。
得られた成形体をアルミナ粉末中に埋込み、大型の脱脂
炉内に静置し、最高温度４８０°Ｃで１０時間保持する
１サイクル８日の脱脂を行った。脱脂後、脱脂成形体の
表面を実体顕微鏡（４０倍）で観察してマイクロクラッ
クの有無を検査した。
その結果、マイクロクラックの発生はなく、修正は不要
であった。
上記の方法と同様にして２００本のターボチャージャー
ロータを射出成形して脱脂した結果、脱脂歩留９９．０
％の高率で、マイクロクランクのない脱脂成形体を得る
ことができた。
脱脂成形体は、更に静水圧プレスにてプレス後、窒素雰
囲気中、常圧で１６５０°Ｃで１時間焼成して焼結体を
得た。
得られた焼結体の切出強度（ｋｇ／ｍｍ２）は、室温７
８８、６〜９９．６ テあり、１０００ ’Ｃテア ６
．８〜８７．３であった。
比較例１
実施例１で用いた有機バインダーの代りに、第２図にそ
のベンゼン溶液のＧＣによる分析結果を、また、第２表
にその性状を示した従来から用いられているパラフィン
ワックス（Ｐ−ｗａｘ）を用いて実施例１と同様にして
、ペレット状の射出成形用原料を得た。得られた射出成
形用原料を用いて、実施例１と同様に射出成形、脱脂を
を行った。
その結果、得られた脱脂成形体には、大きな割れが生し
、その後の工程に進むことができなかった。脱脂歩留は
Ｏであった。
比較例２
脱脂工程の日数を１６日とした以外は、比較例１と全く
同様に、射出成形用原料の調製、射出成形、脱脂を行い
２００本の脱脂成形体を得た。得られた脱脂成形体の表
面を実施例１と同様にマイクロクラックの発生を観察し
たところ、全数の脱脂成形体にマイクロクラックの発生
が見出され、その修正には１本当たり約２分の時間を要
した。
また、修正後の脱脂歩留は９３％であった。
マイクロクラックを修正後、実施例１と同様にして静水
圧プレス、焼成を実施した。その結果、得られた焼結体
の切出強度（ｋｇ／ｍｍ２）は、室温で８５．０〜９８
．３であり、１０００ ’Ｃで７２．３〜８４．４であ
った。
上記の実施例及び比較例より明らかなように、本発明の
有機バインダーを用いて調製したセラミック射出成形用
原料により射出成形した成形体は、最終的に得られた焼
結体の強度から短い脱脂工程時間でも十分に脱脂され、
且つ従来の有機バインダーを用いた場合に発生が避けら
れなかった脱脂成形体表面のマイクロクラ・ツクも抑制
されることが分かる。Hereinafter, the present invention will be explained in detail with reference to Examples. However, the present invention is not limited to the following examples. Example 1 Silicon nitride (5iJ4) powder added with a sintering aid and an organic binder having the composition ratio shown in Table 1 and each property shown in Table 2 were mixed in a volume ratio of 5°150. The mixture was mixed in such a manner that the raw materials for injection molding were obtained in the form of pellets by further kneading in a continuous kneading extruder. (Hereinafter, blank space) For the second injection molding, the injection molding machine "rM-200A-PM" manufactured by Meiki Seisakusho Co., Ltd. was used, and the pellet-shaped raw material for injection molding obtained as described above was filled into the mold. , mold temperature 40°C
1 It was molded into a turbocharger rotor with a blade diameter of 75 mm at a material temperature of 70"C. The molded body obtained was embedded in alumina powder, left standing in a large degreasing furnace, and heated at a maximum temperature of 480 °C for 10 hours. Degreasing was carried out for 8 days per holding cycle.After degreasing, the surface of the degreased molded product was observed with a stereomicroscope (40x magnification) to check for the presence of microcracks. As a result of injection molding and degreasing 200 turbocharger rotors in the same manner as above, the degreasing yield was 99.0.
%, it was possible to obtain a degreased molded body free of microcranks. The degreased molded body was further pressed using a hydrostatic press and then fired at 1650° C. for 1 hour at normal pressure in a nitrogen atmosphere to obtain a sintered body. The cutting strength (kg/mm2) of the obtained sintered body was 7 at room temperature.
88, 6~99.6 Te, 1000'C tare 6
．． It was 8-87.3. Comparative Example 1 Instead of the organic binder used in Example 1, conventionally used paraffin wax (P In the same manner as in Example 1, a pellet-shaped raw material for injection molding was obtained using (-wax). Using the obtained raw material for injection molding, injection molding and degreasing were performed in the same manner as in Example 1. As a result, large cracks appeared in the obtained degreased molded product, and it was not possible to proceed to the subsequent steps. The degreasing yield was O. Comparative Example 2 200 degreased molded bodies were obtained by preparing raw materials for injection molding, injection molding, and degreasing in exactly the same manner as in Comparative Example 1, except that the number of days for the degreasing process was changed to 16 days. When the surface of the obtained degreased molded products was observed for the occurrence of microcracks in the same manner as in Example 1, it was found that microcracks were generated in all the degreased molded products, and it took about 2 minutes per product to correct them. It took time. Moreover, the degreasing yield after correction was 93%. After correcting microcracks, hydrostatic pressing and firing were carried out in the same manner as in Example 1. As a result, the cutting strength (kg/mm2) of the obtained sintered body was 85.0 to 98 at room temperature.
．． 3 and 72.3 to 84.4 at 1000'C. As is clear from the above Examples and Comparative Examples, molded bodies injection molded using the raw material for ceramic injection molding prepared using the organic binder of the present invention have a short degreasing time due to the strength of the final sintered body. It is sufficiently degreased even during the process time,
Furthermore, it can be seen that microcracks on the surface of the degreased molded product, which were unavoidable when conventional organic binders were used, were also suppressed.
本発明の射出成形用の有機バインダー及びそれを用いた
セラミ・ツク焼結体の製造方法においては、脱脂工程で
焼結体特性を低下させるマイクロクラ・７りの発生がな
く、且つ脱脂スケジュールが簡単で脱脂時間も短縮する
ことができる。In the organic binder for injection molding and the method for producing a ceramic sintered body using the organic binder of the present invention, there is no generation of microcracks that deteriorate the properties of the sintered body in the degreasing process, and the degreasing schedule can be adjusted. It's easy and can shorten degreasing time.
第１図は本発明の有機バインダーのガスクロマトグラフ
、第２図は従来の有機バインダーのガスクロマトグラフ
である。FIG. 1 is a gas chromatograph of the organic binder of the present invention, and FIG. 2 is a gas chromatograph of a conventional organic binder.
Claims (2)
、主成分として炭素数Ｃ＿１＿８〜Ｃ＿３＿５のパラフ
ィンを有し、炭素数Ｃ＿２＿３〜Ｃ＿２＿７成分が最大
含有率を示し、炭素数Ｃ＿３＿１成分がＣ＿３＿０成分
より多く炭素数Ｃ＿３＿３成分がＣ＿３＿２成分より多
いことを特徴とするセラミック射出成形用バインダー。(1) An organic binder for ceramic injection molding, which has paraffin with a carbon number of C_1_8 to C_3_5 as a main component, with a carbon number of C_2_3 to C_2_7 components showing the maximum content, and a carbon number of C_3_1 component being larger than a C_3_0 component. A binder for ceramic injection molding, characterized in that the number of carbon atoms in the C_3_3 component is greater than the C_3_2 component.
ダーとセラミックスとを体積比４０／６０〜５５／４５
で混合したセラミック射出成形用原料を用い、射出成形
工程、脱脂工程及び焼成工程からなることを特徴とする
セラミック焼結体の製造方法。(2) The binder for ceramic injection molding according to claim (1) and the ceramics are mixed in a volume ratio of 40/60 to 55/45.
A method for producing a ceramic sintered body, comprising an injection molding step, a degreasing step, and a firing step, using a raw material for ceramic injection molding mixed in the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2319269A JPH04187558A (en) | 1990-11-22 | 1990-11-22 | Binder for injection molding of ceramic and production of sintered ceramic using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2319269A JPH04187558A (en) | 1990-11-22 | 1990-11-22 | Binder for injection molding of ceramic and production of sintered ceramic using the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04187558A true JPH04187558A (en) | 1992-07-06 |
Family
ID=18108324
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2319269A Pending JPH04187558A (en) | 1990-11-22 | 1990-11-22 | Binder for injection molding of ceramic and production of sintered ceramic using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04187558A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110483056A (en) * | 2019-08-30 | 2019-11-22 | 中国兵器科学研究院宁波分院 | A kind of preparation method of silicon carbide ceramics ball |
-
1990
- 1990-11-22 JP JP2319269A patent/JPH04187558A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110483056A (en) * | 2019-08-30 | 2019-11-22 | 中国兵器科学研究院宁波分院 | A kind of preparation method of silicon carbide ceramics ball |
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