JPH09314278A - Titanium / Titanium alloy casting mold material - Google Patents
Titanium / Titanium alloy casting mold materialInfo
- Publication number
- JPH09314278A JPH09314278A JP13694796A JP13694796A JPH09314278A JP H09314278 A JPH09314278 A JP H09314278A JP 13694796 A JP13694796 A JP 13694796A JP 13694796 A JP13694796 A JP 13694796A JP H09314278 A JPH09314278 A JP H09314278A
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- titanium
- cao
- casting
- zirconia
- calcium zirconate
- Prior art date
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Abstract
(57)【要約】
【課題】チタンおよびチタン合金溶湯と鋳型材とが反応
して鋳物表面に変質層を発生するという問題点のない鋳
型材を安価に提供せんとする。
【解決手段】10〜31wt％未満のCaO および残部ジルコニ
アを含有し、化合物の形態が立方晶ZrO2とジルコン酸カ
ルシウム (CaZrO3) 、もしくはジルコン酸カルシウムの
みであることを特徴とするチタン・チタン合金鋳造用鋳
型材。
(57) Abstract: It is an object of the present invention to provide at low cost a casting material that does not have the problem that a molten metal of titanium and a titanium alloy reacts with the casting material to generate an altered layer on the surface of the casting. SOLUTION: Titanium / titanium containing CaO in an amount of 10 to less than 31 wt% and the balance zirconia and having a compound form of cubic ZrO 2 and calcium zirconate (CaZrO 3 ) or calcium zirconate alone. Alloy casting mold material.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、チタンおよびその
合金を鋳造する際に用いる鋳型材に関し、とくに、ゴル
フ用クラブヘッド等をインベストメント鋳造するための
鋳型に用いられる鋳型材である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold material used for casting titanium and its alloys, and more particularly to a mold material used for investment casting of golf club heads and the like.
【０００２】[0002]
【従来の技術】チタンおよびチタン合金 (以下は、単に
「チタン等」という) の精密鋳造法としては、インベス
トメント鋳造法が最も一般的である。この鋳造法は、ワ
ックス模型を、鋳型材と結合剤とを混合してなるスラリ
ーで被覆し、その外層部にジルコンサンド (ZrO2−Si
O2) 、ムライト (３Al2O3 −２SiO2) 等の通常の耐火物
を用いて補強してなる造型法である。このようなインベ
ストメント鋳造用の鋳型としては、強度や通気性などの
鋳型に要求される一般的な条件の他、溶湯に対する安定
性がとくに求められている。このような要請に応えられ
るものとしては、例えば、上記鋳型材と結合剤との組合
わせについては、黒鉛粉末／コロイダル黒鉛、電融ジル
コニア／ジルコニア−ゾル等が代表的なものである。し
かし、黒鉛系鋳型材料、とくに高純度黒鉛は高価であ
り、しかも鋳型を還元性雰囲気で高温焼成しなければな
らないこと、熱伝導度が高いため押湯効果が悪いこと、
造型時の作業環境が悪いこと等の欠点があることから最
近では、電融ジルコニア／ジルコニア−ゾルの組合わせ
が主流となりつつある。2. Description of the Related Art The investment casting method is the most common precision casting method for titanium and titanium alloys (hereinafter simply referred to as "titanium or the like"). In this casting method, a wax model is coated with a slurry obtained by mixing a mold material and a binder, and zircon sand (ZrO 2 --Si
O 2 ), mullite (3Al 2 O 3 -2SiO 2 ) and other ordinary refractory materials are used for reinforcement. As a mold for such investment casting, in addition to general conditions required for the mold such as strength and air permeability, stability to a molten metal is particularly required. As a material that can meet such a demand, for example, graphite powder / colloidal graphite, fused zirconia / zirconia-sol and the like are typical as the combination of the above-mentioned template material and the binder. However, graphite-based mold materials, especially high-purity graphite, are expensive, and the mold must be fired at a high temperature in a reducing atmosphere, and because of high thermal conductivity, the feeder effect is poor,
Recently, a combination of fused zirconia / zirconia-sol is becoming mainstream because of disadvantages such as a bad working environment during molding.
【０００３】また、チタン等を鋳造する際は、さらに別
の問題点もあった。それは、ジルコニアとチタン溶湯と
の間で反応が起こることである。すなわち、チタンやそ
の合金を鋳造する場合、たとえジルコニア鋳型を使用し
たとしても、これらの鋳型とチタン合金溶湯との間で不
可避に反応が起こり、鋳物表面にチタンのアルファ相安
定化元素である炭素 (Ｃ) や酸素 (Ｏ) が侵入し、アル
ファケース (αケース) と呼ばれる変質層が生じる。こ
の変質層は、脆くて亀裂発生の起点になり易いため、除
去しなければならない。その除去方法には、ＨＦ, ＨＮ
Ｏ3 その他を添加した混酸中に鋳物を浸漬し、化学的に
溶解するケミカルミーリング、またはさらに機械的研磨
を併用する方法などがある。しかし、これらの方法は廃
液処理が必要となること、生産性および寸法精度の低下
を招くこと、コストが増加すること、そして作業の安全
性に欠けること等の問題があった。There is another problem when casting titanium or the like. That is, the reaction occurs between zirconia and the molten titanium. That is, when casting titanium or its alloys, even if a zirconia mold is used, an unavoidable reaction occurs between these molds and the titanium alloy melt, and carbon that is an alpha phase stabilizing element of titanium on the casting surface. (C) and oxygen (O) invade to form an altered layer called alpha case (α case). Since this altered layer is brittle and easily becomes a starting point of crack initiation, it must be removed. The removal method is HF, HN
There is a method of immersing a casting in a mixed acid to which O 3 and others are added and chemically dissolving it, or a method of additionally using mechanical polishing. However, these methods have problems that waste liquid treatment is required, productivity and dimensional accuracy are deteriorated, cost is increased, and work safety is lacking.
【０００４】さらに、従来のジルコニア質鋳型材として
は、部分安定化ジルコニアが汎用されているが、この部
分安定化ジルコニアの場合、少量のカルシア(CaO) を安
定化剤として用いるのが一般的である。ただし、この従
来CaO 安定化ジルコニア質鋳型材では、上述したような
鋳型反応が起こり変質層が生じる。これに対し、上記変
質層発生の原因となる鋳型反応を防ぐ見地から、Y2O3安
定化ジルコニア質鋳型材の使用も検討されている。しか
し、この鋳型材におけるY2O3含有量は数％程度で、これ
ではCaO 安定化ジルコニア鋳型材と大差ない。このた
め、Y2O3が１０％前後のものを使用しているが、Y2O3は
CaO に比べ高価であることから、Y2O3安定化ジルコニア
質鋳型材は経済性の点で問題があった。Further, as a conventional zirconia-based template material, partially stabilized zirconia is generally used. In the case of this partially stabilized zirconia, it is common to use a small amount of calcia (CaO) as a stabilizer. is there. However, in this conventional CaO-stabilized zirconia-based template material, the template reaction as described above occurs and an altered layer occurs. On the other hand, the use of Y 2 O 3 -stabilized zirconia-based template material is also being considered from the viewpoint of preventing the template reaction that causes the generation of the altered layer. However, the Y 2 O 3 content in this mold material is about several percent, which is not much different from the CaO-stabilized zirconia mold material. For this reason, Y 2 O 3 is used at around 10%, but Y 2 O 3 is
Since it is more expensive than CaO, the Y 2 O 3 -stabilized zirconia-based mold material has a problem in terms of economy.
【０００５】また、鋳造金属溶湯 (チタン等) と鋳型材
との鋳型反応を防ぐ目的で、Ｗ, Nb等の高融点金属粉
末、Y2O3, La2O3 等の希土類酸化物、その他の鋳型材も
検討されてきた。しかし、これらの方法も経済性、成型
性、結合剤などの点に解決すべき多くの問題点があり、
採用されるまでにはなっていない。Further, in order to prevent the casting reaction between the molten casting metal (titanium or the like) and the casting material, refractory metal powder such as W and Nb, rare earth oxide such as Y 2 O 3 and La 2 O 3 , and others. Mold materials have also been considered. However, these methods also have many problems to be solved in terms of economical efficiency, moldability, binder, etc.,
It has not been adopted yet.
【０００６】[0006]
【発明が解決しようとする課題】本発明の目的は、従来
使用されているCaO 安定化ジルコニア質鋳型材やY2O3安
定化ジルコニア質鋳型材などにおける上述した問題点、
とくにチタンおよびチタン合金溶湯と鋳型材とが反応し
て鋳物表面に変質層を発生するという問題点のない鋳型
材を安価に提供せんとするところにある。DISCLOSURE OF THE INVENTION The object of the present invention is to solve the above-mentioned problems in conventionally used CaO-stabilized zirconia-based casting materials and Y 2 O 3 -stabilized zirconia-based casting materials,
In particular, it is an object of the present invention to provide at low cost a casting material that does not have the problem that titanium and titanium alloy molten metal react with the casting material to form an altered layer on the surface of the casting.
【０００７】[0007]
【課題を解決するための手段】本発明者らは、上記目的
の実現に向け鋭意研究を続けた結果、むしろ多量のCaO
を安定化剤として使用することでチタン等と反応しにく
く安価なチタン等の鋳造用ジルコニア質鋳型材が得られ
ることを知見して本発明に想到した。すなわち、本発明
は、 (1) 10wt％以上のCaO および残部ジルコニアを含有し、
化合物の形態が立方晶ZrO2およびジルコン酸カルシウム
(CaZrO3)であることを特徴とするチタン・チタン合金鋳
造用鋳型材。 (2) 10〜31wt％未満のCaO および残部ジルコニアを含有
し、化合物の形態が立方晶ZrO2とジルコン酸カルシウム
(CaZrO3) 、もしくはジルコン酸カルシウムのみである
ことを特徴とするチタン・チタン合金鋳造用鋳型材。 (3) 10〜18wt％未満のCaO および残部ジルコニアを含有
し、化合物の形態が56〜96wt％の立方晶ZrO3と44〜４wt
％のジルコン酸カルシウム (CaZrO3) および残部不可避
混入物であることを特徴とする鋳型材。 (4) 18wt％以上〜26wt％未満のCaO および残部ジルコニ
アを含有し、化合物の形態が17〜56wt％の立方晶ZrO3と
83〜44wt％のジルコン酸カルシウム (CaZrO3) および残
部不可避混入物であることを特徴とする鋳型材。 (5) 26〜31wt％未満のCaO および残部ジルコニアを含有
し、化合物の形態が17wt％未満の立方晶ZrO3と83wt％以
上のジルコン酸カルシウム (CaZrO3) および残部不可避
混入物であることを特徴とする鋳型材。 (6) 31wt％超のカルシアと残部ジルコニアを含有し、化
合物の形態がジルコン酸カルシウム (CaZrO3) と不可避
混入物のみからなることを特徴とする鋳型材。 (7) 31wt％超のカルシアと残部ジルコニアを含有し、化
合物の形態がジルコン酸カルシウム (CaZrO3) の形態を
とるものが98wt％以上で、残部不可避的混入物としてそ
の他の酸化物を2 wt％未満含有するものであることを特
徴とする鋳型材。を要旨構成とするものである。[Means for Solving the Problems] The inventors of the present invention continued to diligently study to achieve the above-mentioned object, and as a result, rather large amount of CaO
The present invention was conceived to be based on the finding that the use of as a stabilizer makes it possible to obtain an inexpensive casting zirconia-based mold material such as titanium that is less likely to react with titanium and the like. That is, the present invention contains (1) 10 wt% or more of CaO and the balance zirconia,
The compound morphology is cubic ZrO 2 and calcium zirconate
(CaZrO 3 ), a titanium / titanium alloy casting mold material. (2) Containing 10 to less than 31 wt% CaO and the balance zirconia, and the compound morphology is cubic ZrO 2 and calcium zirconate.
(CaZrO 3 ), or a titanium / titanium alloy casting mold material characterized by being only calcium zirconate. (3) CuO containing 10 to less than 18 wt% CaO and the balance zirconia, and the compound morphology is cubic ZrO 3 and 44 to 4 wt%
% Of calcium zirconate (CaZrO 3 ) and the balance unavoidable mixture of casting materials. (4) CuO containing at least 18 wt% and less than 26 wt% CaO and the balance zirconia, and having a compound morphology of 17 to 56 wt% cubic ZrO 3 .
A casting material characterized by 83-44 wt% calcium zirconate (CaZrO 3 ) and the balance unavoidable mixture. (5) It contains 26 to less than 31 wt% CaO and the balance zirconia, and the compound morphology is less than 17 wt% cubic ZrO 3 , 83 wt% or more calcium zirconate (CaZrO 3 ) and the balance inevitable mixture. Characteristic mold material. (6) A template material containing more than 31 wt% of calcia and the balance zirconia, and the compound morphology consists only of calcium zirconate (CaZrO 3 ) and inevitable contaminants. (7) Containing more than 31 wt% of calcia and the balance zirconia, the compound form is calcium zirconate (CaZrO 3 ), 98 wt% or more, and the balance is 2 wt% of other oxides as unavoidable contaminants. % Of the mold material. Is the gist structure.
【０００８】[0008]
【発明の実施の形態】発明者らの研究によると、既知の
CaO 安定化ジルコニアというのは、その含有するCaO 含
有量により表１に示すような化合物形態をとることがわ
かった。BEST MODE FOR CARRYING OUT THE INVENTION According to the inventors' research,
It was found that CaO-stabilized zirconia takes a compound form as shown in Table 1 depending on the content of CaO contained therein.
【０００９】[0009]
【表１】 [Table 1]
【００１０】従来のCaO 安定化ジルコニア質鋳型材は一
般に、CaO 含有量：０〜８％のものがほとんどである。
そこで本発明者らは、CaO 添加量を８％以上に増加させ
た。その結果を表２に示す。Most conventional CaO-stabilized zirconia-based mold materials generally have a CaO content of 0 to 8%.
Therefore, the present inventors increased the amount of CaO added to 8% or more. The results are shown in Table 2.
【表２】 [Table 2]
【００１１】表２に示すように、CaO の添加量を10wt％
以上にすると、その化合物の形態は、単斜晶ZrO2は完全
に消滅し、４wt％以下の立方晶ZrO2と４wt％以下のCaZr
O3とからなるものになる。そして、CaO の添加量が18wt
％を超えると、立方晶ZrO2とCaZrO3の割合は (56：44)
となり、CaO の添加量が26wt％では、立方晶ZrO2：CaZr
O3＝17：83となり、そして、CaO ：31wt％超では立方晶
ZrO2は消えてCaZrO3のみ (ただし、不可避混入物として
２wt％以下の他の酸化物を含有する) からなる化合物と
なることを知見した。As shown in Table 2, the addition amount of CaO is 10 wt%.
As described above, the morphology of the compound is such that monoclinic ZrO 2 disappears completely and cubic ZrO 2 of 4 wt% or less and CaZr of 4 wt% or less.
It consists of O 3 . And the addition amount of CaO is 18wt
%, The ratio of cubic ZrO 2 and CaZrO 3 is (56:44)
Therefore, when the amount of CaO added is 26 wt%, cubic ZrO 2 : CaZr
O 3 = 17: 83, and CuO: cubic crystals above 31 wt%
It was found that ZrO 2 disappears and becomes a compound consisting of CaZrO 3 only (however, other oxides of 2 wt% or less are contained as unavoidable contaminants).
【００１２】そこで、発明者らは、このようにして得ら
れたジルコニア質鋳型材のCaZrO3量と変質層の厚みとの
関係を調査した。その結果、鋳型材中のCaZrO3量が増加
するにつれて、変質層の厚みが減少することがわかっ
た。Therefore, the inventors investigated the relationship between the amount of CaZrO 3 in the zirconia-based mold material thus obtained and the thickness of the altered layer. As a result, it was found that as the amount of CaZrO 3 in the mold material increased, the thickness of the altered layer decreased.
【００１３】しかも、ZrO2とCaO とを等モル比 (CaO ：
31wt％) とした場合、あるいはCaOリッチな状態とした
場合には、この鋳型材の化合物組成はCaZrO3が主体とな
り (98wt％以上) 、残部が不可避混入物, 即ち、SiO2,
Fe2O3, TiO2, MgO, Al2O3 等のその他の酸化物を２％未
満の範囲内で含有するものとなるが、これを従来のCaO
安定化ジルコニア質鋳型材、Y2O3安定化ジルコニア質鋳
型材と比較すると、大幅に前記変質層の厚みが減少する
ことが判った。Moreover, ZrO 2 and CaO have an equimolar ratio (CaO:
31 wt%) or a CaO-rich state, the compound composition of this template material is mainly CaZrO 3 (98 wt% or more), and the balance is unavoidable contaminants, that is, SiO 2 ,
Other oxides such as Fe 2 O 3 , TiO 2 , MgO and Al 2 O 3 will be contained within the range of less than 2%.
It was found that the thickness of the altered layer was significantly reduced as compared with the stabilized zirconia-based template material and the Y 2 O 3 stabilized zirconia-based template material.
【００１４】以上説明したように本発明は、ジルコニア
とカルシアとを含有する化合物であって、電融処理して
得られる化合物の形態が立方晶ZrO2とジルコン酸カルシ
ウムからなるもの、好ましくは不可避的混入物を除きほ
とんど総てがジルコン酸カルシウムの形態をとる鋳型材
としたものである。なお、本発明において、ジルコン酸
カルシウム (CaZrO3) の量は多いほど好ましいが、その
他の酸化物については、その上限を２wt％にしないと、
カルシウムシリケート等の酸化物とカルシアとの酸化物
からなる化合物を生成し、反応層への影響が無視できな
いものとなるからであり、上述した組成のものに限定さ
れる。As described above, the present invention is a compound containing zirconia and calcia, wherein the form of the compound obtained by electromelting treatment is cubic ZrO 2 and calcium zirconate, preferably unavoidable. Almost all of the materials except the chemical contaminants were used as the casting material in the form of calcium zirconate. In the present invention, the larger the amount of calcium zirconate (CaZrO 3 ) is, the more preferable it is. However, for other oxides, the upper limit is 2 wt%,
This is because a compound composed of an oxide of calcium silicate or the like and an oxide of calcia is produced, and the influence on the reaction layer becomes non-negligible, and the composition is limited to the above-mentioned one.
【００１５】[0015]
実施例１ 電融法(150 KVAアーク式電気炉) により、ジルコンサン
ドとCaO とを、表３に示す重量割合 (CaO レベル：10wt
％、18wt％、26wt％) となるように配合してともに溶解
し、破砕 (ジョークラッシャー) し、粉砕 (アルミナポ
ツトミル) したのち、所定の粒度とした。これら３種の
鋳型材の他、比較のために、従来のジルコニア質鋳型材
および電融カルシアを用意し、各々に結合剤としてCaCl
2 −アルコール溶液を10：１の割合で加えて混合した。
これらを、図１に示すように、１種づつ内径40mm、高さ
30mmのアルミナ管に内張りし、内径25mmの円筒状小鋳型
を作製した。このようにして作製した５種の鋳型を内径
50mm、高さ 150mmのアルミナ管内に積み重ね、全体をさ
らにアルミナるつぼ５内に入れ、1223Ｋで7200ｓの条件
で加熱し、加熱後はただちに真空溶解炉内にセットし
た。ただし、図１の符号１はCaO 製湯口、２は黒鉛、３
はアルミナ管、４は円筒状小鋳型、５はアルミナるつぼ
である。Example 1 Zircon sand and CaO were mixed in a weight ratio (CaO level: 10 wt%) shown in Table 3 by an electrofusion method (150 KVA arc type electric furnace).
%, 18 wt%, 26 wt%), dissolved together, crushed (jaw crusher), crushed (alumina pot mill), and then made to have a predetermined particle size. In addition to these three types of template materials, a conventional zirconia-based template material and electrofused calcia were prepared for comparison, and CaCl was used as a binder for each.
2 -Alcohol solution was added at a ratio of 10: 1 and mixed.
These are, as shown in Fig. 1, one type each with an inner diameter of 40 mm and a height
A 30 mm alumina tube was lined and a small cylindrical mold having an inner diameter of 25 mm was prepared. The inner diameter of the five types of molds
They were stacked in an alumina tube having a height of 50 mm and a height of 150 mm, further placed in an alumina crucible 5, heated at 1223 K for 7200 s, and immediately after heating, they were set in a vacuum melting furnace. However, reference numeral 1 in FIG. 1 is a CaO gate, 2 is graphite, and 3 is
Is an alumina tube, 4 is a small cylindrical mold, and 5 is an alumina crucible.
【００１６】[0016]
【表３】 [Table 3]
【００１７】上記の鋳型を３セット用意し、各々に Ti−15％Ｖ−３％Sn−３％Cr−３％Al Ti−10％Ｖ−２％Fe−３％Al Ti−５％Al−２％Sn−２％Zr−４％Cr−４％Mo の３種のチタン合金を真空溶解炉内の石灰るつぼで高周
波溶解した後、上記円筒状小鋳型内に鋳込んだ。冷却
後、上記各小鋳型の中央部で鋳塊を切断し、横断面の組
織を１０％ＨＦ−５％ＨＮＯ3 溶液で腐食し変質層の厚
みを測定した。その結果を表４に示す。Three sets of the above molds were prepared, and each of them had Ti-15% V-3% Sn-3% Cr-3% Al Ti-10% V-2% Fe-3% Al Ti-5% Al-. Three kinds of titanium alloys of 2% Sn-2% Zr-4% Cr-4% Mo were subjected to high frequency melting in a lime crucible in a vacuum melting furnace and then cast into the small cylindrical mold. After cooling, the ingot was cut at the center of each of the small molds, the structure of the cross section was corroded with a 10% HF-5% HNO 3 solution, and the thickness of the altered layer was measured. The results are shown in Table 4.
【００１８】[0018]
【表４】 [Table 4]
【００１９】表４ならびにジルコニア鋳型材中のCaO 量
(％) と変質層の厚みの関係を示す図２からわかるよう
に、CaO 量の増加、すなわち、CaZrO3量の増加と共に変
質層の厚みが減少することが確認された。とくにCaO を
31wt％添加したCaZrO3≧９８wt％の鋳型材を用いたもの
では、変質層の厚みは 100μm 程度になることがわかっ
た。Table 4 and the amount of CaO in the zirconia mold material
As can be seen from FIG. 2, which shows the relationship between (%) and the thickness of the altered layer, it was confirmed that the thickness of the altered layer decreases as the amount of CaO increases, that is, the amount of CaZrO 3 increases. Especially CaO
It was found that the thickness of the deteriorated layer was about 100 μm in the case of using the template material of CaZrO 3 ≧ 98 wt% added with 31 wt%.
【００２０】実施例２ 実施例１と同じように、電融法によりCaO を重量割合で
３１％含有したジルコニア質鋳型材を溶解し、破砕、粉
砕後所定の粒度とした。この鋳型材の組成は、CaZrO3が
９８％以上であった。比較のため、従来のCaO を４％含
有したCaO 安定化ジルコニア鋳型材、Y2O3を１０％含有
したY2O3安定化ジルコニア鋳型材および電融カルシアを
用意し、実施例１と同様の方法で鋳型を構成した。この
鋳型にTi−15％Ｖ−３％Al−３％Cr−３％SnのTi合金溶
湯を鋳込み変質層の厚みを測定した。その結果、CaO を
３１％含有した鋳型材すなわち、その組成は、９８％以
上のCaZrO3である鋳型材は、図３に示すように、従来
のCaO 安定化ジルコニア鋳型材、Y2O3安定化ジルコニ
ア鋳型材, 黒鉛鋳型材と比較すると、その変質層の
厚みは最大でほぼ８分の１に減少した。Example 2 In the same manner as in Example 1, a zirconia-based mold material containing 31% by weight of CaO 3 was melted by an electrofusion method, crushed and crushed to obtain a predetermined particle size. The composition of this template material was 98% or more of CaZrO 3 . For comparison, a conventional CaO 4% content was CaO stabilized zirconia mold material, Y 2 O 3 were prepared containing 10% were Y 2 O 3 stabilized zirconia template material and electrically fused calcia, similarly to Example 1 The mold was constructed by the method of. A Ti-15% V-3% Al-3% Cr-3% Sn Ti alloy melt was cast into this mold and the thickness of the altered layer was measured. As a result, the template material containing 31% of CaO, that is, the template material of which the composition is 98% or more of CaZrO 3 , shows that the conventional CaO-stabilized zirconia template material, Y 2 O 3 stable material, as shown in FIG. The thickness of the deteriorated layer was reduced to about 1/8 at the maximum, compared with those of the zirconia-templated material and the graphite-templated material.
【００２１】[0021]
【発明の効果】以上説明したように本発明によれば、鋳
造金属溶湯 (チタンおよびその合金)と反応しにくい鋳
型材を安価に提供できると共に、鋳物表面に生じる変質
層を抑制することができる。As described above, according to the present invention, it is possible to inexpensively provide a casting material that does not easily react with a molten cast metal (titanium and its alloys), and it is possible to suppress an altered layer generated on the surface of a casting. .
【図１】チタンおよびその合金鋳造用鋳型の断面図であ
る。FIG. 1 is a cross-sectional view of a mold for casting titanium and its alloy.
【図２】鋳型材中のCaO 量と変質層の厚みとの関係を示
すグラフである。FIG. 2 is a graph showing the relationship between the amount of CaO in the mold material and the thickness of the altered layer.
【図３】各種の鋳型材と変質層の厚みとの関係を示すグ
ラフである。FIG. 3 is a graph showing the relationship between various casting materials and the thickness of the altered layer.
Claims (7)
を含有し、化合物の形態が立方晶ZrO2およびジルコン酸
カルシウム(CaZrO3)であることを特徴とするチタン・チ
タン合金鋳造用鋳型材。1. A casting material for titanium-titanium alloy casting, which contains 10% by weight or more of CaO and the balance zirconia, and the compound forms are cubic ZrO 2 and calcium zirconate (CaZrO 3 ).
ニアを含有し、化合物の形態が立方晶ZrO2とジルコン酸
カルシウム (CaZrO3) 、もしくはジルコン酸カルシウム
のみであることを特徴とするチタン・チタン合金鋳造用
鋳型材。2. Titanium containing CaO in an amount of 10 to less than 31 wt% and the balance zirconia and having a compound form of cubic ZrO 2 and calcium zirconate (CaZrO 3 ) or calcium zirconate alone. Titanium alloy casting mold material.
ニアを含有し、化合物の形態が56〜96wt％の立方晶ZrO3
と44〜４wt％のジルコン酸カルシウム (CaZrO3) および
残部不可避混入物であることを特徴とする請求項２に記
載の鋳型材。3. Cubic ZrO 3 containing 10 to less than 18 wt% CaO and the balance zirconia and having a compound morphology of 56 to 96 wt%.
The mold material according to claim 2, wherein the content is 44 to 4 wt% of calcium zirconate (CaZrO 3 ) and the balance unavoidable mixture.
部ジルコニアを含有し、化合物の形態が17〜56wt％の立
方晶ZrO3と83〜44wt％のジルコン酸カルシウム (CaZr
O3) および残部不可避混入物であることを特徴とする請
求項２に記載の鋳型材。4. A cubic ZrO 3 containing from 18 wt% to less than 26 wt% CaO and the balance zirconia in the form of 17 to 56 wt% and 83 to 44 wt% calcium zirconate (CaZr).
The mold material according to claim 2, which is O 3 ) and the balance unavoidable mixture.
ニアを含有し、化合物の形態が17wt％未満の立方晶ZrO3
と83wt％以上のジルコン酸カルシウム (CaZrO3) および
残部不可避混入物であることを特徴とする請求項２に記
載の鋳型材。5. Cubic ZrO 3 containing less than 26-31 wt% CaO and the balance zirconia and less than 17 wt% morphology of the compound.
And 83 wt% or more of calcium zirconate (CaZrO 3 ) and the balance unavoidable mixture, The casting material according to claim 2.
含有し、化合物の形態がジルコン酸カルシウム (CaZr
O3) と不可避混入物のみからなることを特徴とする請求
項２に記載の鋳型材。6. A compound containing more than 31 wt% of calcia and the balance zirconia and having a compound form of calcium zirconate (CaZr).
The mold material according to claim 2, which is composed of only O 3 ) and unavoidable contaminants.
含有し、化合物の形態がジルコン酸カルシウム (CaZr
O3) の形態をとるものが98wt％以上で、残部不可避的混
入物としてその他の酸化物を2 wt％未満含有するもので
あることを特徴とする請求項６に記載の鋳型材。7. A compound containing more than 31 wt% of calcia and the balance zirconia and having a compound form of calcium zirconate (CaZr
The mold material according to claim 6, characterized in that the content of O 3 ) is 98 wt% or more, and the remaining unavoidable contaminants contain less than 2 wt% of other oxides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13694796A JP3866792B2 (en) | 1996-05-30 | 1996-05-30 | Titanium / titanium alloy casting mold material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13694796A JP3866792B2 (en) | 1996-05-30 | 1996-05-30 | Titanium / titanium alloy casting mold material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09314278A true JPH09314278A (en) | 1997-12-09 |
| JP3866792B2 JP3866792B2 (en) | 2007-01-10 |
Family
ID=15187246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13694796A Expired - Lifetime JP3866792B2 (en) | 1996-05-30 | 1996-05-30 | Titanium / titanium alloy casting mold material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3866792B2 (en) |
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