JPH09267313A - Sialon powder cast molding - Google Patents
Sialon powder cast moldingInfo
- Publication number
- JPH09267313A JPH09267313A JP8099657A JP9965796A JPH09267313A JP H09267313 A JPH09267313 A JP H09267313A JP 8099657 A JP8099657 A JP 8099657A JP 9965796 A JP9965796 A JP 9965796A JP H09267313 A JPH09267313 A JP H09267313A
- Authority
- JP
- Japan
- Prior art keywords
- slurry
- sialon powder
- dispersant
- sialon
- molding
- 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
- 239000000843 powder Substances 0.000 title claims abstract description 37
- 238000000465 moulding Methods 0.000 title claims abstract description 22
- 239000002002 slurry Substances 0.000 claims abstract description 42
- 238000000034 method Methods 0.000 claims abstract description 18
- 239000002270 dispersing agent Substances 0.000 claims abstract description 17
- 239000007787 solid Substances 0.000 claims abstract description 17
- 150000003242 quaternary ammonium salts Chemical class 0.000 claims abstract description 12
- 239000002904 solvent Substances 0.000 claims abstract description 7
- 239000011268 mixed slurry Substances 0.000 claims abstract description 3
- 238000005266 casting Methods 0.000 claims description 8
- 230000007547 defect Effects 0.000 abstract description 12
- 238000002156 mixing Methods 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 10
- 239000002245 particle Substances 0.000 description 6
- 229910052602 gypsum Inorganic materials 0.000 description 5
- 239000010440 gypsum Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 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 3
- 239000011230 binding agent Substances 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000839 emulsion Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- 229920002125 Sokalan® Polymers 0.000 description 2
- 150000003863 ammonium salts Chemical class 0.000 description 2
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000004584 polyacrylic acid Substances 0.000 description 2
- 238000002360 preparation method 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
- 238000005245 sintering Methods 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 238000007088 Archimedes method Methods 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004931 aggregating effect Effects 0.000 description 1
- 230000002152 alkylating effect Effects 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 150000003864 primary ammonium salts Chemical class 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 150000003512 tertiary amines Chemical class 0.000 description 1
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Producing Shaped Articles From Materials (AREA)
- Ceramic Products (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、サイアロン質粉末
の鋳込成形方法に関し、特に大型品や厚肉品の鋳込成形
方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for casting sialon powder, and more particularly to a method for casting large-sized products and thick-walled products.
【０００２】[0002]
【従来の技術】サイアロンセラミックスは、高温強度、
耐摩耗性、耐酸化性等に優れ、エンジン部品、ガスター
ビン等の高温構造材料としての応用が期待されている。
セラミックスは一般に成形工程を経て作製されるが、そ
の成形方法の一つとして鋳込成形法がある。この鋳込成
形は、セラミックス粉末に溶媒（例えば水、アルコール
等）を加え、それに分散剤を添加し混合して作製したス
ラリーを型（石膏型、多孔質樹脂型等）に流し込み、型
が溶媒を吸収することを利用してスラリーを固化する成
形方法である。2. Description of the Related Art Sialon ceramics has high temperature strength,
It has excellent wear resistance and oxidation resistance, and is expected to be applied as a high temperature structural material for engine parts and gas turbines.
Ceramics are generally manufactured through a molding process, and one of the molding methods is a cast molding method. In this cast molding, a solvent (for example, water, alcohol, etc.) is added to ceramic powder, and a slurry prepared by adding and mixing a dispersant is poured into a mold (gypsum mold, porous resin mold, etc.), and the mold is the solvent. It is a molding method of solidifying the slurry by utilizing the absorption of
【０００３】この鋳込成形法によるサイアロン質粉末の
成形としては、Ｒｈｅｏｌｏｇｉｃａｌ ｐｒｏｐｅｒ
ｔｉｅｓ ｎｉｔｒｉｄｅ ａｑｕｅｏｕｓ ｓｌｉ
ｐ．Ｔｈｉｒｄ Ｅｕｒｏ−Ｃｅｒａｍ．１９９３，１
ｐｐ５１３−１８．に見られるように、ポリアクリル
酸アンモニウム塩が分散剤として用いられている。As a method for molding a sialon powder by this casting method, a rheological property is used.
ties nitride aqueous sl
p. Third Euro-Ceram. 1993, 1
pp513-18. As can be seen in U.S.A., a polyacrylic acid ammonium salt is used as a dispersant.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、この分
散剤を用いて鋳込み可能なスラリーにするためには、サ
イアロン質粉末（固形分）のスラリー中の容積比率（割
合）は４２ｖｏｌ％程度と低くせざるを得ず、このよう
に固形分の割合が低いと、大型品や厚肉品の成形におい
ては、成形体内部にスジ状の欠陥が生じ易くなるという
問題があった。この欠陥は、固形分の割合を高くするこ
とで抑制することができるが、固形分の割合を高くする
とスラリーの粘度が急激に高くなるばかりでなく、場合
によってはスラリーがダイラタンシー性を示し、鋳込み
できなくなる。However, in order to make a slurry that can be cast using this dispersant, the volume ratio (ratio) of the sialon powder (solid content) in the slurry should be as low as 42 vol%. Inevitably, when the proportion of solid content is low, there is a problem that streaky defects are likely to occur inside the molded body when molding a large-sized product or a thick product. This defect can be suppressed by increasing the proportion of solids, but increasing the proportion of solids not only sharply increases the viscosity of the slurry, but in some cases the slurry exhibits dilatancy, become unable.
【０００５】本発明は、上述した従来のサイアロン質粉
末の鋳込成形方法が有する課題に鑑みなされたものであ
って、その目的は、スラリー中の固形分の割合を高くし
てもスラリーの粘度を低く抑えることができ、その結
果、成形体内部のスジ状の欠陥を抑えることができるサ
イアロン質粉末の鋳込成形方法を提供することにある。The present invention has been made in view of the problems of the above-mentioned conventional cast molding method of sialon powder, and its purpose is to increase the viscosity of the slurry even if the solid content in the slurry is increased. Therefore, it is an object of the present invention to provide a cast molding method of a sialon-like powder, which can suppress the streaky defects inside the molded body as a result.
【０００６】[0006]
【課題を解決するための手段】本発明者等は、上記目的
を達成するため鋭意研究した結果、分散剤として第４級
アンモニウム塩を用いれば、スラリー中の固形分の割合
を高くしても鋳込み可能な低い粘度のスラリーとするこ
とができ、その結果、成形体内部のスジ状の欠陥を防げ
るとの知見を得て本発明を完成した。Means for Solving the Problems The inventors of the present invention have conducted extensive studies to achieve the above object, and as a result, if a quaternary ammonium salt is used as a dispersant, the solid content in the slurry can be increased. The present invention has been completed based on the finding that a slurry with a low viscosity that can be cast can be obtained, and as a result, it is possible to prevent streak-like defects inside the molded body.
【０００７】即ち本発明は、サイアロン質粉末に溶媒を
加え、それに分散剤を添加して混合し、その混合したス
ラリーを型に鋳込む成形方法において、該サイアロン質
粉末の細かさが平均粒径で０．９μｍ以下であり、該分
散剤が第４級アンモニウム塩で、かつその添加量がサイ
アロン質粉末１００重量部に対し０．０５〜１．０重量
部であり、該スラリー中の固形分の割合が４５〜５３ｖ
ｏｌ％であることを特徴とするサイアロン質粉末の鋳込
成形方法を要旨とする。以下さらに詳細に説明する。That is, according to the present invention, in a molding method in which a solvent is added to a sialon powder, a dispersant is added to the solvent, and the mixed slurry is cast in a mold, the fineness of the sialon powder is an average particle size. Is 0.9 μm or less, the dispersant is a quaternary ammonium salt, and the addition amount thereof is 0.05 to 1.0 part by weight with respect to 100 parts by weight of sialon powder, and the solid content in the slurry is Of 45-53v
The gist is a sialon powder casting method characterized by being ol%. This will be described in more detail below.
【０００８】上記で述べたように、本発明に使用する分
散剤としては、第４級アンモニウム塩とした。分散剤に
この第４級アンモニウム塩を使用することで、以下の理
由によりスラリーの粘度を低くすることができるものと
思われる。As described above, the dispersant used in the present invention is a quaternary ammonium salt. It is considered that the viscosity of the slurry can be lowered by using the quaternary ammonium salt as the dispersant for the following reasons.
【０００９】それは、第４級アンモニウム塩の親水基が
正に帯電しているため、アルカリ性で負に帯電している
サイアロン質粉末表面に容易に吸着する。そのうえ、こ
の分散剤が粒子表面の負に帯電しているサイトを奪い、
粒子−水分子間を結び付けている水素結合を切断して粒
子の凝集を防ぐことにより、分散効果をさらに高くする
ものと思われる。この分散効果がより高いことにより、
スラリー中の固形分の割合を高くしてもスラリーの粘度
を低くすることができるものと思われる。この第４級ア
ンモニウム塩は、第３級アミンをアルキル化して得られ
るものであり、アルカリ性でも安定に存在し得る。鋳込
成形においては、使われる石膏型が酸性に弱いため、ア
ルカリ性でスラリーを調整する場合が多く、この特性は
重要である。Since the hydrophilic group of the quaternary ammonium salt is positively charged, it is easily adsorbed on the surface of the alkaline and negatively charged sialon powder. Moreover, this dispersant robs the negatively charged sites on the particle surface,
It is considered that the dispersion effect is further enhanced by breaking the hydrogen bond connecting the particles and water molecules to prevent the particles from aggregating. Due to this higher dispersion effect,
It is considered that the viscosity of the slurry can be lowered even if the ratio of the solid content in the slurry is increased. This quaternary ammonium salt is obtained by alkylating a tertiary amine and can exist stably even in an alkaline condition. In cast molding, since the gypsum mold used is weak against acidity, the slurry is often adjusted to be alkaline, and this property is important.
【００１０】上記第４級アンモニウム塩を添加する量と
しては、サイアロン質粉末１００重量部に対し０．０５
〜１．０重量部とした。より好ましくは０．１〜０．５
重量部である。０．０５重量部より少ないと分散効果が
小さく、鋳込み可能なスラリーが得られなかったり、ス
ラリーが非常に高粘度となったりする。添加量が１．０
重量部より多くてもスラリーの粘度が増加し、鋳込みし
難くなる。The amount of the quaternary ammonium salt added is 0.05 based on 100 parts by weight of the sialon powder.
.About.1.0 part by weight. More preferably 0.1-0.5
Parts by weight. If the amount is less than 0.05 parts by weight, the dispersion effect is small and a slurry that cannot be cast is not obtained, or the slurry has a very high viscosity. Addition amount is 1.0
Even if it is more than the weight part, the viscosity of the slurry increases and it becomes difficult to cast it.
【００１１】また、本発明に使用するサイアロン質粉末
の細かさとしては、平均粒径で０．９μｍ以下とした。
０．９μｍより粗いと焼結体の緻密化に劣り、焼結体の
特性に影響する。このサイアロン質粉末に必要に応じて
イットリア、アルミナなどの公知の焼結助剤を添加する
ことは差し支えない。The fineness of the sialon powder used in the present invention is 0.9 μm or less in average particle size.
If it is coarser than 0.9 μm, the densification of the sintered body will be poor, and the characteristics of the sintered body will be affected. If necessary, a known sintering aid such as yttria or alumina may be added to the sialon powder.
【００１２】上記サイアロン質粉末のスラリー中の割合
としては、４５〜５３ｖｏｌ％とした。４５ｖｏｌ％よ
り低いと、低粘度のスラリーが得られるものの、大型品
や厚肉品の成形体中にスジ状の欠陥が残留する。５３ｖ
ｏｌ％より高いと分散が不十分となることから、スラリ
ーがダイラタンシーを示し、鋳込みし難くなる。成形体
の強度を高めるために、結合剤を添加することは可能で
あり、アクリルエマルジョン等を用いても差し支えな
い。The ratio of the sialon powder in the slurry was 45 to 53 vol%. If it is lower than 45 vol%, a low-viscosity slurry can be obtained, but streak-like defects remain in the molded product of a large product or a thick product. 53v
When it is higher than ol%, the dispersion becomes insufficient, so that the slurry exhibits dilatancy and becomes difficult to cast. It is possible to add a binder in order to increase the strength of the molded body, and an acrylic emulsion or the like may be used.
【００１３】[0013]
【発明の実施の形態】本発明のサイアロン質粉末の鋳込
成形方法をさらに詳細に述べると、先ず用いるサイアロ
ン質粉末としては、サイアロン粉末、あるいはサイアロ
ン組成となる窒化けい素、窒化アルミニウム及びアルミ
ナ粉末を配合した粉末、もしくはサイアロン粉末に窒化
けい素、窒化アルミニウム、アルミナ粉末の内の１種以
上を配合した粉末などがあり、それら粉末に、溶媒とし
てイオン交換水をスラリー中の固形分の割合が４５〜５
３ｖｏｌ％となるように加え、それに分散剤として第４
級アンモニウム塩をサイアロン質粉末１００重量部に対
し、０．０５〜１．０重量部添加して混合し、これに必
要があればアクリルエマルジョン等の結合剤を加えてス
ラリーを作製する。BEST MODE FOR CARRYING OUT THE INVENTION The casting molding method for sialon powder of the present invention will be described in more detail. First, as the sialon powder to be used, sialon powder, or silicon nitride, aluminum nitride and alumina powder having a sialon composition are used. Or a powder obtained by blending sialon powder with at least one of silicon nitride, aluminum nitride, and alumina powder, and ion-exchanged water as a solvent in these powders having a solid content in the slurry. 45-5
3 vol% and added as a dispersant to the 4th
The primary ammonium salt is added to 0.05 to 1.0 parts by weight with respect to 100 parts by weight of the sialon powder and mixed, and if necessary, a binder such as an acrylic emulsion is added to prepare a slurry.
【００１４】そのスラリーを真空脱泡した後、石膏型に
圧力をかけないで、あるいは必要があれば数ｋｇｆ／ｃ
ｍ2以下の圧力をかけながら、もしくは吸引して減圧し
ながらスラリーを注入する。注入したスラリー中の水を
石膏型に吸水させて固化させた後、固化した成形体を慣
用の方法によって所定の雰囲気、焼成温度、焼成時間で
焼結する。After degassing the slurry in a vacuum, without applying pressure to the gypsum mold, or if necessary, several kgf / c
The slurry is injected while applying a pressure of m 2 or less or by suctioning and reducing the pressure. After water in the poured slurry is absorbed in a gypsum mold to be solidified, the solidified compact is sintered by a conventional method in a predetermined atmosphere, a firing temperature, and a firing time.
【００１５】以上、分散剤として第４級アンモニウム塩
を用いれば、固形分の割合が高くても低粘度のスラリー
を作製することができ、そのスラリーを鋳込んで固化す
れば、内部にスジ状の欠陥の無い成形体とすることがで
きる。As described above, when a quaternary ammonium salt is used as a dispersant, a low-viscosity slurry can be prepared even if the solid content is high, and when the slurry is cast and solidified, a streak is formed inside. It is possible to obtain a molded product having no defects.
【００１６】[0016]
【実施例】以下、本発明の実施例を比較例と共に挙げ、
本発明をより詳細に説明する。EXAMPLES Examples of the present invention will be described below together with comparative examples.
The present invention will be described in more detail.
【００１７】（実施例１〜８） （１）スラリーの作製 表１に示す平均粒径を有するサイアロン粉末１００重量
部に対して、イオン交換水を表１に示す固形分割合とな
るように加え、それに第４級アンモニウム塩を表１に示
す量だけ添加し、ボールミルで２４時間混合した。この
混合物に結合剤としてアクリルエマルジョンを３重量部
添加し、減圧容器内で攪拌及び真空脱泡を行い、スラリ
ーを作製した。(Examples 1 to 8) (1) Preparation of slurry To 100 parts by weight of sialon powder having an average particle size shown in Table 1, ion-exchanged water was added so as to have a solid content ratio shown in Table 1. Then, a quaternary ammonium salt was added thereto in an amount shown in Table 1 and mixed by a ball mill for 24 hours. To this mixture, 3 parts by weight of acrylic emulsion was added as a binder, and the mixture was stirred and degassed in a vacuum in a vacuum vessel to prepare a slurry.
【００１８】（２）成形体及び焼結体の作製 作製したスラリーを、１５０×１５０×２０ｍｍの石膏
型に流し込んだ後、圧力２ｋｇｆ／ｃｍ2、保持時間３
時間で加圧成形を行い、スラリーを固化した。得られた
成形体を４０℃で一晩、１００℃で２時間乾燥した後、
窒素雰囲気中で１７５０℃の温度で３時間保持して焼結
体を得た。(2) Preparation of molded body and sintered body The prepared slurry was poured into a gypsum mold of 150 × 150 × 20 mm, then pressure 2 kgf / cm 2 , holding time 3
Pressure molding was performed for a time to solidify the slurry. After drying the obtained molded body at 40 ° C. overnight and at 100 ° C. for 2 hours,
The temperature was maintained at 1750 ° C. for 3 hours in a nitrogen atmosphere to obtain a sintered body.
【００１９】（３）評価 スラリーの流動特性の評価のため、回転粘度計（ＶＴ−
０４：リオン製）で粘度を測定した。また、成形体内部
の欠陥をみるため、脱型後の成形体を２つに割り、目視
で観察して欠陥の有無を調べた。さらに、焼結体の評価
のため、アルキメデス法で焼結体の嵩密度を測定した。
これらの結果を表１に示す。(3) Evaluation To evaluate the flow characteristics of the slurry, a rotational viscometer (VT-
04: manufactured by Rion) to measure the viscosity. Further, in order to see defects inside the molded body, the molded body after demolding was divided into two and visually observed to check the presence or absence of defects. Furthermore, in order to evaluate the sintered body, the bulk density of the sintered body was measured by the Archimedes method.
Table 1 shows the results.
【００２０】（比較例１〜５）比較のために、比較例
１、２では、分散剤にポリアクリル酸アンモニウム塩を
用いた他は実施例と同様に焼結体を作製、評価した。ま
た、比較例３、４では第４級アンモニウム塩の添加量
を、比較例５ではサイアロン粉末の細かさを本発明の範
囲外にする他は実施例と同様に焼結体を作製、評価し
た。それらの結果を表１に示す。(Comparative Examples 1 to 5) For comparison, in Comparative Examples 1 and 2, sintered bodies were prepared and evaluated in the same manner as in Examples except that ammonium polyacrylate was used as the dispersant. In addition, in Comparative Examples 3 and 4, a sintered body was prepared and evaluated in the same manner as in the Example except that the amount of the quaternary ammonium salt added was changed to Comparative Example 5 and the fineness of the sialon powder was adjusted to fall outside the range of the present invention. . Table 1 shows the results.
【００２１】[0021]
【表１】 [Table 1]
【００２２】表１から明らかなように、実施例において
は、固形分の割合が４５〜５３ｖｏｌ％と高いにも関わ
らず、スラリーの粘度が０．２Ｐａ・ｓ以下と極めて低
粘度であり、そのスラリーを鋳込んで作製した成形体
は、厚肉品にも関わらず、その内部にスジ状の欠陥は認
められなかった。また、その成形体を焼結した焼結体の
嵩密度は、３．２２×１０3ｋｇ／ｍ3以上（相体密度９
９％以上）と高密度で緻密な焼結体であった。As is clear from Table 1, in the Examples, the viscosity of the slurry was extremely low at 0.2 Pa · s or less, even though the solid content was as high as 45 to 53 vol%. The molded product produced by casting the slurry had no streak-like defects inside, though it was a thick product. The bulk density of the sintered body obtained by sintering the compact is 3.22 × 10 3 kg / m 3 or more (phase density 9
It was a dense and dense sintered body (9% or more).
【００２３】これに対して比較例１、２においては、従
来のポリアクリル酸アンモニウム塩を用いているので、
固形分の割合が４５ｖｏｌ％では鋳込みできず、４２ｖ
ｏｌ％とすれば粘度が低いので鋳込みはできるものの、
成形体内部にスジ状の欠陥がみられ、焼結体の嵩密度も
３．２を割っていた。また、比較例３、４においては、
本発明の分散剤を使用しているものの、その添加量が本
発明の範囲外にあるので、スラリーにならなかったり
（比較例３）、成形体の一部が充填不足であったり（比
較例４）して満足した成形体が得られなかった。さらに
比較例５においては、サイアロン粉末の細かさが本発明
の範囲外にあるので、成形体までは満足できるが、焼結
体の嵩密度に問題があった。On the other hand, in Comparative Examples 1 and 2, since the conventional polyacrylic acid ammonium salt is used,
When the ratio of solid content is 45 vol%, it cannot be cast and 42v
If it is ol%, it can be cast because the viscosity is low, but
Streak-like defects were found inside the molded body, and the bulk density of the sintered body was less than 3.2. In Comparative Examples 3 and 4,
Although the dispersant of the present invention was used, the amount added was outside the range of the present invention, so that it did not become a slurry (Comparative Example 3), or a part of the molded body was insufficiently filled (Comparative Example). 4) and a satisfactory molded product was not obtained. Further, in Comparative Example 5, since the fineness of the sialon powder is outside the scope of the present invention, the molded body can be satisfied, but there is a problem in the bulk density of the sintered body.
【００２４】[0024]
【発明の効果】以上の通り、本発明にかかる鋳込成形方
法によれば、スラリーを極めて低粘度にすることができ
るので、スラリー中の固形分の割合を高くしても支障無
く鋳込みできるようになった。このことにより、大型品
や厚肉品の成形に対しても、成形体内部にスジ状の欠陥
の無いサイアロン質粉末の鋳込成形ができるようになっ
た。As described above, according to the cast molding method of the present invention, the viscosity of the slurry can be made extremely low. Therefore, even if the ratio of the solid content in the slurry is increased, the casting can be performed without any trouble. Became. As a result, even when molding a large-sized product or a thick-walled product, it has become possible to perform the cast molding of sialon powder without streaky defects inside the molded product.
Claims (1)
分散剤を添加して混合し、その混合したスラリーを型に
鋳込む成形方法において、該サイアロン質粉末の細かさ
が平均粒径で０．９μｍ以下であり、該分散剤が第４級
アンモニウム塩で、かつその添加量がサイアロン質粉末
１００重量部に対し０．０５〜１．０重量部であり、該
スラリー中の固形分の割合が４５〜５３ｖｏｌ％である
ことを特徴とするサイアロン質粉末の鋳込成形方法。1. A molding method in which a solvent is added to a sialon powder, a dispersant is added thereto and mixed, and the mixed slurry is cast into a mold, wherein the fineness of the sialon powder is 0. 9 μm or less, the dispersant is a quaternary ammonium salt, and the addition amount thereof is 0.05 to 1.0 part by weight with respect to 100 parts by weight of sialon powder, and the proportion of solid content in the slurry is 45-53 vol%, a sialon powder casting method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8099657A JPH09267313A (en) | 1996-03-29 | 1996-03-29 | Sialon powder cast molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8099657A JPH09267313A (en) | 1996-03-29 | 1996-03-29 | Sialon powder cast molding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09267313A true JPH09267313A (en) | 1997-10-14 |
Family
ID=14253132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8099657A Pending JPH09267313A (en) | 1996-03-29 | 1996-03-29 | Sialon powder cast molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09267313A (en) |
-
1996
- 1996-03-29 JP JP8099657A patent/JPH09267313A/en active Pending
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