JPH0813055A - Method for hardening surface of ti-al intermetallic compound and product produced by the method - Google Patents
Method for hardening surface of ti-al intermetallic compound and product produced by the methodInfo
- Publication number
- JPH0813055A JPH0813055A JP6146047A JP14604794A JPH0813055A JP H0813055 A JPH0813055 A JP H0813055A JP 6146047 A JP6146047 A JP 6146047A JP 14604794 A JP14604794 A JP 14604794A JP H0813055 A JPH0813055 A JP H0813055A
- Authority
- JP
- Japan
- Prior art keywords
- phase
- tial
- product
- sintered body
- intermetallic compound
- 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
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- Powder Metallurgy (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は粉末冶金、粉末射出成形
等、粉末を成形し、加熱処理により、堅固な成形品を作
製する成形方法において、ＴｉＡｌ粉末を用いて作製し
た焼結体の表面硬度を向上させることが可能な表面硬化
方法に関するものであり、さらにその方法により表面を
硬化させたＴｉＡｌ金属間化合物の製品に関するもので
ある。BACKGROUND OF THE INVENTION The present invention relates to a surface of a sintered body produced by using TiAl powder in a forming method for producing a solid molded product by molding the powder by heat treatment such as powder metallurgy and powder injection molding. The present invention relates to a surface hardening method capable of improving hardness, and further relates to a TiAl intermetallic compound product whose surface is hardened by the method.
【０００２】[0002]
【従来の技術】従来より、ＴｉＡｌ合金の成形品は、そ
の合金粉末を成形し、圧粉、脱脂あるいは焼結等の熱処
理により、粉末冶金法、粉末射出成形法等により作製さ
れる。しかし、この様に作製されたＴｉＡｌ合金の成形
品は硬度が低く、成形品表面に傷がつきやすく、耐摩耗
性も不十分であった。そこで、このＴｉＡｌ合金の表面
を硬化させる方法も種々検討がなされている。2. Description of the Related Art Conventionally, a TiAl alloy molded article is produced by a powder metallurgy method, a powder injection molding method or the like by molding the alloy powder and subjecting it to heat treatment such as compaction, degreasing or sintering. However, the molded product of the TiAl alloy produced in this way had low hardness, the surface of the molded product was easily scratched, and the wear resistance was insufficient. Therefore, various studies have been made on a method of hardening the surface of the TiAl alloy.
【０００３】従来のＴｉＡｌ合金の表面硬化方法として
は、日本金属学会会報第３２巻第２号７３〜７７ページ
に記載されている様に、熱処理により部材全体の組織を
ＴｉＡｌとＴｉ3 Ａｌの層状組織に変化させることによ
り表面硬度を向上させる方法がある。As a conventional surface hardening method for TiAl alloys, as described in Proceedings of the Japan Institute of Metals, Vol. 32, No. 2, pp. 73-77, the structure of the entire member is layered by TiAl and Ti 3 Al by heat treatment. There is a method of improving the surface hardness by changing the texture.
【０００４】さらに特開平５−７７０８５号公報に記載
されている様に、ＴｉＡｌ合金中に炭化物または酸化物
を有する特定組成の粉末を製品表面に肉盛り溶接するこ
とにより表面硬度を向上させる方法がある。Further, as described in JP-A-5-77085, there is a method of improving surface hardness by depositing a powder having a specific composition having a carbide or oxide in a TiAl alloy on the surface of a product. is there.
【０００５】[0005]
【発明が解決しようとする課題】しかし、Ｔｉ3 Ａｌ相
を多く含むと表面硬度は向上する反面、材料として脆化
を生じるようになる。よって、前者の熱処理により部材
全体の組織をＴｉＡｌとＴｉ3 Ａｌの層状組織に変化さ
せる方法は、製品に脆化が起こり、実用化に乏しい。ま
た、後者の肉盛り溶接する方法は、ＴｉＡｌ中に炭化
物、酸化物が分散することにより表面荒れがおきる。ま
た両者共、製品の製造工程に、新たな工程を加えなけれ
ばならない。However, when a large amount of Ti 3 Al phase is contained, the surface hardness is improved, but the material becomes brittle. Therefore, the former method of changing the structure of the entire member into the layered structure of TiAl and Ti 3 Al by the heat treatment causes brittleness of the product and is not practically used. In the latter method of overlay welding, surface roughness occurs due to the dispersion of carbides and oxides in TiAl. Further, both of them must add a new process to the manufacturing process of the product.
【０００６】そこで、本発明の目的は、上記課題を解決
して、製品の脆化および表面荒れを起こさず製品表面近
傍の硬度を向上させることにより、表面の耐摩耗性の向
上および傷つき防止が可能なＴｉＡｌ金属間化合物を提
供することであり、その表面硬化方法を提供することで
ある。Therefore, an object of the present invention is to solve the above problems and improve the hardness in the vicinity of the surface of a product without causing embrittlement and surface roughness of the product, thereby improving the wear resistance of the surface and preventing scratches. It is to provide a possible TiAl intermetallic compound and to provide a surface hardening method thereof.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に、本発明の表面硬化方法は下記記載の構成を採用す
る。In order to achieve the above object, the surface hardening method of the present invention adopts the constitution described below.
【０００８】本発明の第１の表面硬化方法は、ＴｉＡｌ
粉末を用いて成形された圧粉体、脱脂体の焼結体表面に
Ｔｉ3 Ａｌ相を析出させ、表面層をＴｉＡｌ相とＴｉ3
Ａｌ相の混合相にすることにより、表面硬度を向上させ
ることを特徴とするＴｉＡｌ金属間化合物の表面硬化方
法である。The first surface hardening method of the present invention is TiAl.
A Ti 3 Al phase is deposited on the surface of a sintered compact of a green compact or a degreased body formed by using the powder, and the surface layer is formed of TiAl phase and Ti 3
A surface hardening method for a TiAl intermetallic compound, characterized in that the surface hardness is improved by using a mixed phase of an Al phase.
【０００９】また、本発明の第２の表面硬化方法は、前
記Ｔｉ3 Ａｌ相を析出させる工程を、焼結体を作製する
際に圧粉体または脱脂体表面のＡｌを蒸発させることに
より行うＴｉＡｌ金属間化合物の表面硬化方法である。In the second surface hardening method of the present invention, the step of depositing the Ti 3 Al phase is performed by evaporating Al on the surface of the green compact or the degreased body when the sintered body is produced. This is a surface hardening method for a TiAl intermetallic compound.
【００１０】さらに、本発明の第３の表面硬化方法は、
前記、圧粉体または脱脂体表面のＡｌを蒸発させる方法
を、焼結工程中の温度、時間および圧力を制御すること
により行うＴｉＡｌ金属間化合物の表面硬化方法であ
る。Furthermore, the third surface hardening method of the present invention is
The above-mentioned method for evaporating Al on the surface of the green compact or degreased body is a method for surface hardening a TiAl intermetallic compound by controlling the temperature, time and pressure during the sintering step.
【００１１】本発明の製品は上記本発明のＴｉＡｌ金属
間化合物の表面硬化方法により、表面硬化がなされたＴ
ｉＡｌ金属間化合物の製品である。The product of the present invention is T surface-treated by the surface hardening method of the above TiAl intermetallic compound of the present invention.
It is a product of iAl intermetallic compound.
【００１２】本発明中の、圧粉体または脱脂体表面のＡ
ｌを蒸発させる工程における焼結炉内の温度及び圧力
は、保持温度が１３００℃〜１４００℃、圧力が１０-3
Ｔｏｒｒ以下である。また、前記保持温度および圧力に
応じて保持時間を最適な時間に制御することが好まし
い。A of the surface of the green compact or degreased body in the present invention
Regarding the temperature and pressure in the sintering furnace in the step of evaporating l, the holding temperature is 1300 ° C to 1400 ° C, and the pressure is 10 -3.
It is less than Torr. Further, it is preferable to control the holding time to an optimum time according to the holding temperature and pressure.
【００１３】本発明の表面硬化方法における、焼結体表
面へＴｉ3 Ａｌ相を析出させる工程は、粉末冶金、粉末
射出成形等の焼結の工程で行うことができる。すなわ
ち、前記焼結の工程において、焼結炉内の温度、時間お
よび圧力を制御することによりＡｌを蒸発させること
で、焼結体の表面にＴｉ3 Ａｌ相を析出させることがで
き、表面層をＴｉＡｌ相とＴｉ3 Ａｌ相の混合相にする
事ができる。The step of depositing the Ti 3 Al phase on the surface of the sintered body in the surface hardening method of the present invention can be carried out by a sintering step such as powder metallurgy or powder injection molding. That is, in the above-mentioned sintering step, Ti 3 Al phase can be precipitated on the surface of the sintered body by evaporating Al by controlling the temperature, time and pressure in the sintering furnace. Can be a mixed phase of TiAl phase and Ti 3 Al phase.
【００１４】以上の方法を用いることにより、製品の脆
化および表面荒れを起こさず、焼結体の表面硬度を向上
させることができる。本発明の表面硬化方法は、例えば
時計の外装材料に利用することができ、ＴｉＡｌ金属間
化合物の時計外装製品を作製することができる。By using the above method, the surface hardness of the sintered body can be improved without causing embrittlement and surface roughness of the product. INDUSTRIAL APPLICABILITY The surface hardening method of the present invention can be used, for example, as a timepiece exterior material, and can produce a timepiece exterior product of TiAl intermetallic compound.
【００１５】[0015]
【作用】Ｔｉ−Ａｌ系２元系状態図によれば、ＴｉＡｌ
の組成は、ＴｉＡｌ相とＴｉ3Ａｌ相の共存領域線のＡ
ｌリッチ側に位置する。よって、ＴｉＡｌの組成を僅か
にずらし、Ａｌ濃度が少なくなると、このＴｉＡｌ相と
Ｔｉ3 Ａｌ相の共存領域内に位置することになる。この
領域では、ＴｉＡｌ相とＴｉ3 Ａｌ相の層状組織が形成
される。この層状組織は、ＴｉＡｌ相より硬さは大きい
がその反面脆い。よって、製品全体の組織をこの層状組
織にすると脆化が起こり、ひび割れが起きたり、割れや
すくなったりする。本発明の硬化方法は、ＴｉＡｌの圧
粉体または脱脂体表面のＡｌを蒸発させることにより、
製品の表面にＴｉ3 Ａｌ相を析出させ、表面だけをこの
層状組織にすることができ、製品の脆化を起こさずに表
面硬度を上げることができる。この表面の層状組織の厚
さは、３００μｍ以下が好ましく、３００μｍ以上にな
ると、焼結時の歪による変形等が起きてしまい、更に厚
くなると、製品の脆化が起きてしまう。According to the Ti-Al binary system phase diagram, TiAl
The composition of A is the A of the coexistence region line of TiAl phase and Ti 3 Al phase.
Located on the rich side. Therefore, if the composition of TiAl is slightly shifted and the Al concentration decreases, the TiAl phase and Ti 3 Al phase are located in the coexisting region. In this region, a layered structure of TiAl phase and Ti 3 Al phase is formed. This layered structure is harder than the TiAl phase, but on the other hand it is brittle. Therefore, if the structure of the entire product is made to have this layered structure, embrittlement occurs, and cracks occur or cracks easily occur. The hardening method of the present invention is to evaporate Al on the surface of a TiAl green compact or degreased body,
The Ti 3 Al phase can be deposited on the surface of the product, and only the surface can have this layered structure, and the surface hardness can be increased without causing embrittlement of the product. The thickness of the layered structure on the surface is preferably 300 μm or less, and when it is 300 μm or more, deformation due to strain during sintering occurs, and when it is further increased, the product becomes brittle.
【００１６】また、本発明の硬化方法においては、Ｔｉ
Ａｌ粉末を焼結する際にＴｉとＡｌの蒸気圧に差がある
ことを利用し、Ｔｉの蒸気圧以上Ａｌの蒸気圧以下の圧
力中で焼結することにより、表面近傍からＡｌのみを蒸
発させることができる。表面からＡｌが蒸発することに
より、表面近傍にＴｉ3 Ａｌ相が析出し、ＴｉＡｌ相と
Ｔｉ3 Ａｌ相の層状組織が形成される。さらに、Ａｌの
蒸発は表面から進行するため、焼結時の温度、圧力およ
び時間を調整することにより、焼結体表面の層状組織の
厚さを制御することができる。焼結炉の保持温度が１３
００℃を下回ると焼結時の収縮不十分のため焼結体の密
度が向上せず、機械的性質に劣る。また１４００℃を超
えると、焼結体全体の組織が層状組織に変化し、脆化
し、延性が低下するため、焼結炉の保持温度は１３００
℃以上１４００℃以下であることが好ましい。また、圧
力は上記温度範囲において、Ｔｉが蒸発せずにＡｌが蒸
発しやすいように１０-6〜１０-3Ｔｏｒｒである必要が
ある。更に焼結炉内で保持する時間は長すぎると層状組
織が厚くなり、製品の延性が低下し、短いと逆に層状組
織が薄くなり、十分な表面硬度が得られなくなるので、
上記温度および圧力に応じて制御することが好ましい。Further, in the curing method of the present invention, Ti
Taking advantage of the difference in vapor pressure between Ti and Al when sintering Al powder, by sintering at a pressure between Ti vapor pressure and Al vapor pressure, only Al is evaporated from near the surface. Can be made. As Al evaporates from the surface, a Ti 3 Al phase is precipitated near the surface and a layered structure of the TiAl phase and the Ti 3 Al phase is formed. Furthermore, since the evaporation of Al proceeds from the surface, the thickness of the layered structure on the surface of the sintered body can be controlled by adjusting the temperature, pressure and time during sintering. The holding temperature of the sintering furnace is 13
If the temperature is lower than 00 ° C., the shrinkage during sintering will be insufficient and the density of the sintered body will not be improved, resulting in poor mechanical properties. On the other hand, if the temperature exceeds 1400 ° C., the structure of the entire sintered body changes into a layered structure, embrittles, and the ductility decreases, so the holding temperature of the sintering furnace is 1300.
It is preferable that the temperature is not less than 0 ° C and not more than 1400 ° C. In addition, the pressure needs to be 10 −6 to 10 −3 Torr in the above temperature range so that Ti does not evaporate and Al easily evaporates. Furthermore, if the time for holding in the sintering furnace is too long, the layered structure becomes thick, and the ductility of the product is reduced.If it is too short, the layered structure becomes thin, and sufficient surface hardness cannot be obtained.
It is preferable to control according to the above temperature and pressure.
【００１７】図１に本発明の硬化方法を用いて硬化させ
た焼結体の断面組織を模式的に示す。表面は、ＴｉＡｌ
相とＴｉ3 Ａｌ相の層状組織であり、内部はＴｉＡｌ相
の等軸組織が存在するので、製品自体の延性は失われな
い。以上示した様に、本発明の硬化方法を用いることに
よって、ＴｉＡｌ粉末製品の脆化および表面荒れを起こ
さず、製品表面近傍の硬度を向上させることができ、表
面の耐摩耗性の向上および傷つき防止が可能なＴｉＡｌ
焼結体を製造することができる。FIG. 1 schematically shows the sectional structure of a sintered body which has been cured by the curing method of the present invention. The surface is TiAl
Since it is a layered structure of the phase and the Ti 3 Al phase, and the equiaxed structure of the TiAl phase exists inside, the ductility of the product itself is not lost. As shown above, by using the curing method of the present invention, it is possible to improve the hardness in the vicinity of the product surface without causing embrittlement and surface roughness of the TiAl powder product, improve the wear resistance of the surface, and scratch the surface. Preventable TiAl
A sintered body can be manufactured.
【００１８】[0018]
【実施例】以下本発明について実施例１〜６により説明
する。EXAMPLES The present invention will be described below with reference to Examples 1 to 6.
【００１９】（実施例１）表面硬化をおこなう部材の材
料粉末として、Ｔｉ−５０ａｔ％Ａｌ合金粉末（平均粒
径１１μｍ）を用意し、この粉末を油圧プレスによって
圧縮成形し、６ｍｍφ×４ｍｍの円柱状の圧粉体を作製
した。この圧粉体を１３００℃まで昇温速度１０℃／ｍ
ｉｎで加熱し、この温度を保持温度とし、２時間保持し
た後、約５．６℃／ｍｉｎの冷却速度で冷却することに
より焼結体を作製した。なお焼結工程中の雰囲気圧力
は、１０-4〜１０-5Ｔｏｒｒである。Example 1 A Ti-50 at% Al alloy powder (average particle size: 11 μm) was prepared as a material powder for a member to be surface-hardened, and this powder was compression-molded by a hydraulic press to obtain a 6 mmφ × 4 mm circle. A columnar green compact was produced. This green compact is heated up to 1300 ° C. at a heating rate of 10 ° C./m
After heating at in, this temperature was kept at the holding temperature for 2 hours, the sintered body was produced by cooling at a cooling rate of about 5.6 ° C./min. The atmospheric pressure during the sintering process is 10 −4 to 10 −5 Torr.
【００２０】（実施例２）保持温度を１３５０℃に変え
た以外は実施例１と同様に行い、焼結体を作製した。(Example 2) A sintered body was prepared in the same manner as in Example 1 except that the holding temperature was changed to 1350 ° C.
【００２１】（実施例３）保持温度を１４００℃に変え
た以外は実施例１と同様に行い、焼結体を作製した。(Example 3) A sintered body was prepared in the same manner as in Example 1 except that the holding temperature was changed to 1400 ° C.
【００２２】（実施例４）保持時間を４時間に変えた以
外は実施例１と同様に行い、焼結体を作製した。Example 4 A sintered body was prepared in the same manner as in Example 1 except that the holding time was changed to 4 hours.
【００２３】（実施例５）保持温度を１３５０℃、保持
時間を４時間に変えた以外は実施例１と同様に行い、焼
結体を作製した。(Example 5) A sintered body was produced in the same manner as in Example 1 except that the holding temperature was changed to 1350 ° C and the holding time was changed to 4 hours.
【００２４】（実施例６）保持温度を１４００℃、保持
時間を４時間に変えた以外は実施例１と同様に行い、焼
結体を作製した。Example 6 A sintered body was produced in the same manner as in Example 1 except that the holding temperature was changed to 1400 ° C. and the holding time was changed to 4 hours.
【００２５】（比較例１）保持温度を１２５０℃に変え
た以外は実施例１と同様に行い、焼結体を作製した。Comparative Example 1 A sintered body was prepared in the same manner as in Example 1 except that the holding temperature was changed to 1250 ° C.
【００２６】（比較例２）保持温度を１４５０℃に変え
た以外は実施例１と同様に行い、焼結体を作製した。Comparative Example 2 A sintered body was prepared in the same manner as in Example 1 except that the holding temperature was changed to 1450 ° C.
【００２７】各実施例により作製した焼結体を切断し、
硝酸とフッ酸の混酸（濃硝酸：フッ酸：水＝３：２：１
９５）により約３０秒間エッチングを行い、組織観察を
行い、層状組織の厚さ、ビッカース硬さおよび焼結体内
部の等軸ＴｉＡｌ相のビッカース硬さを測定した。その
結果を表１に示す。各実施例により作製した焼結体にお
いては、表面近傍に４５μｍ〜２４０μｍのＴｉＡｌ相
とＴｉ3 Ａｌ相の層状組織が観察され、内部は等軸のＴ
ｉＡｌ相であった。表１から表面近傍に存在するＴｉＡ
ｌ相とＴｉ3 Ａｌ相の層状組織の方が内部に存在する等
軸ＴｉＡｌ相よりビッカース硬さが向上していることが
明白であり、表面硬度が可なり上昇していることがわか
る。また焼結温度の上昇、保持時間の増加に伴い層状組
織の層厚は広くなっており、層状組織の厚さに、焼結温
度、保持時間が関与していることが分かる。比較例１で
作製した焼結体は、断面にポアが多く、適当な研磨およ
びエッチングを行っても組織が見られず、ビッカース硬
さの測定もできなかった。これは焼結工程中の保持温度
が１２５０℃と低いため、収縮が不十分となり、ポアが
多くなったためと考えられる。また、比較例２で作製し
た焼結体は、組織観察の結果、全体の組織がＴｉＡｌ相
とＴｉ3 Ａｌ相の層状組織となっており、そのビッカー
ス硬さは３００．２Ｈｖであった。これは、焼結工程中
の保持温度が１４５０℃と高いためであり、焼結体には
溶融した跡も見られた。The sintered body produced in each example was cut into
Mixed acid of nitric acid and hydrofluoric acid (concentrated nitric acid: hydrofluoric acid: water = 3: 2: 1)
95), the structure was observed by etching for about 30 seconds, and the thickness of the layered structure, the Vickers hardness and the Vickers hardness of the equiaxial TiAl phase inside the sintered body were measured. Table 1 shows the results. In sintered body produced by each example, the layered structure of the TiAl phase and Ti 3 Al phase 45μm~240μm near the surface was observed and the inside of equiaxed T
It was the iAl phase. From Table 1, TiA existing near the surface
It is clear that the layered structure of the 1 phase and the Ti 3 Al phase has a higher Vickers hardness than the equiaxed TiAl phase existing inside, and it can be seen that the surface hardness increases considerably. Further, it is understood that the layer thickness of the layered structure becomes wider as the sintering temperature rises and the holding time increases, and the sintering temperature and the holding time are involved in the thickness of the layered structure. The sintered body produced in Comparative Example 1 had many pores in the cross section, no structure was observed even after appropriate polishing and etching, and Vickers hardness could not be measured. It is considered that this is because the holding temperature during the sintering process was as low as 1250 ° C., so that the shrinkage became insufficient and the pores increased. In addition, as a result of observation of the structure, the sintered body produced in Comparative Example 2 had a layered structure of TiAl phase and Ti 3 Al phase, and its Vickers hardness was 300.2 Hv. This is because the holding temperature during the sintering process was as high as 1450 ° C., and a trace of melting was also found in the sintered body.
【００２８】[0028]
【表１】 [Table 1]
【００２９】[0029]
【発明の効果】以上の説明で明らかなように、本発明の
硬化方法を用いると、ＴｉＡｌ粉末を所定の温度、圧
力、時間で焼結することにより表面にＴｉ3 Ａｌ相とＴ
ｉＡｌ相の層状組織を析出させることができ、内部より
硬質の表面を形成する製品を得られる。また、その時の
温度、圧力および時間を制御することにより、その層状
組織の層厚を制御することが可能になり、用途に応じ
た、表面硬質層の厚みを持った製品の製造ができるよう
になり、表面の耐摩耗性の向上および傷つき防止が可能
となる。しかも、本発明の硬化方法により作製した製品
は、内部が等軸のＴｉＡｌ組織を有しており、製品自体
の延性は失われず、製品内部の脆化が起こらない。ま
た、製品表面に炭化物、酸化物等が分散されないため、
表面荒れも起こらない。さらに、本発明の硬化方法は、
焼結工程と同時に行えるため、新たな工程を加える必要
がなく、有意義である。As is apparent from the above description, when the hardening method of the present invention is used, the Ti 3 Al phase and T
A layered structure of the iAl phase can be precipitated, and a product having a harder surface than the inside can be obtained. Further, by controlling the temperature, pressure and time at that time, it becomes possible to control the layer thickness of the layered structure, so that it is possible to manufacture a product having a surface hard layer thickness according to the application. Therefore, it becomes possible to improve the wear resistance of the surface and prevent scratches. Moreover, the product produced by the curing method of the present invention has an equiaxed TiAl structure inside, the ductility of the product itself is not lost, and the product does not become brittle. In addition, since carbides and oxides are not dispersed on the product surface,
No surface roughness occurs. Furthermore, the curing method of the present invention,
Since it can be performed at the same time as the sintering step, it is not necessary to add a new step, which is significant.
【図１】本発明法を用いて作製した焼結体の断面組織の
模式図である。FIG. 1 is a schematic diagram of a cross-sectional structure of a sintered body produced by the method of the present invention.
１ ＴｉＡｌ焼結体 ２ 等軸ＴｉＡｌ相 ３ ＴｉＡｌ相 ４ Ｔｉ3 Ａｌ相 ５ ＴｉＡｌ相＋Ｔｉ3 Ａｌ相の層状組織部1 TiAl sintered two equal axes TiAl phase 3 TiAl phase 4 Ti 3 Al phase 5 TiAl phase + Ti 3 Al phase of layered tissue section
Claims (4)
体、脱脂体の焼結体表面にＴｉ3 Ａｌ相を析出させ、表
面層をＴｉＡｌ相とＴｉ3 Ａｌ相の混合相にすることに
より、表面硬度を向上させることを特徴とするＴｉＡｌ
金属間化合物の表面硬化方法。1. A Ti 3 Al phase is deposited on the surface of a sintered body of a green compact or a degreased body formed by using TiAl powder, and the surface layer is made into a mixed phase of the TiAl phase and the Ti 3 Al phase. , TiAl characterized by improving surface hardness
Surface hardening method of intermetallic compound.
焼結体を作製する際に表面のＡｌを蒸発させることによ
り行うことを特徴とする請求項１に記載のＴｉＡｌ金属
間化合物の表面硬化方法。2. The step of depositing the Ti 3 Al phase comprises:
The surface hardening method for a TiAl intermetallic compound according to claim 1, which is carried out by evaporating Al on the surface when the sintered body is produced.
焼結工程中の温度、時間および圧力を制御することによ
り、焼結体表面のＡｌを蒸発させることによって行うこ
とを特徴とする請求項１に記載のＴｉＡｌ金属間化合物
の表面硬化方法。3. The step of depositing the Ti 3 Al phase comprises:
The surface hardening method for a TiAl intermetallic compound according to claim 1, which is carried out by evaporating Al on the surface of the sintered body by controlling the temperature, time and pressure during the sintering step.
金属間化合物の表面硬化方法により作製した製品。4. TiAl according to claim 1, 2 or 3.
Products made by the intermetallic compound surface hardening method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6146047A JPH0813055A (en) | 1994-06-28 | 1994-06-28 | Method for hardening surface of ti-al intermetallic compound and product produced by the method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6146047A JPH0813055A (en) | 1994-06-28 | 1994-06-28 | Method for hardening surface of ti-al intermetallic compound and product produced by the method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0813055A true JPH0813055A (en) | 1996-01-16 |
Family
ID=15398905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6146047A Pending JPH0813055A (en) | 1994-06-28 | 1994-06-28 | Method for hardening surface of ti-al intermetallic compound and product produced by the method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0813055A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6270914B1 (en) * | 1995-11-08 | 2001-08-07 | Citizen Watch Co., Ltd. | Surface-hardened titanium material, surface hardening method of titanium material, watchcase decoration article, and decoration article |
| CN103993311A (en) * | 2014-06-06 | 2014-08-20 | 江苏大学 | Method for preparing Ti-Si alloy coating on titanium metal surface |
| WO2017179652A1 (en) * | 2016-04-14 | 2017-10-19 | 国立研究開発法人物質・材料研究機構 | Titanium alloy and method for producing material for timepiece exterior parts |
-
1994
- 1994-06-28 JP JP6146047A patent/JPH0813055A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6270914B1 (en) * | 1995-11-08 | 2001-08-07 | Citizen Watch Co., Ltd. | Surface-hardened titanium material, surface hardening method of titanium material, watchcase decoration article, and decoration article |
| CN103993311A (en) * | 2014-06-06 | 2014-08-20 | 江苏大学 | Method for preparing Ti-Si alloy coating on titanium metal surface |
| WO2017179652A1 (en) * | 2016-04-14 | 2017-10-19 | 国立研究開発法人物質・材料研究機構 | Titanium alloy and method for producing material for timepiece exterior parts |
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