JP2743974B2 - Control method of carbon content and oxygen content of degreased molded body in metal powder injection molding method - Google Patents
Control method of carbon content and oxygen content of degreased molded body in metal powder injection molding methodInfo
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- JP2743974B2 JP2743974B2 JP10469393A JP10469393A JP2743974B2 JP 2743974 B2 JP2743974 B2 JP 2743974B2 JP 10469393 A JP10469393 A JP 10469393A JP 10469393 A JP10469393 A JP 10469393A JP 2743974 B2 JP2743974 B2 JP 2743974B2
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- amount
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Description
【０００１】[0001]
【産業上の利用分野】本発明は、金属粉末射出成形法に
おける脱脂された成形体中の炭素量及び酸素量を精度良
く制御する方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for precisely controlling the amounts of carbon and oxygen in a degreased compact in a metal powder injection molding method.
【０００２】[0002]
【従来の技術】従来、金属粉末射出成形法では、特開昭
58-153702 号公報（USP 4,415,528 ）、特開昭63-18310
3 号公報（USP 4,836,980 ）や特開平3-45566 号公報
（USP 4,996,022 ）等に開示されているように脱脂され
た成形体の炭素量、酸素量をできるだけ低減するため、
バインダー分解後に、残留する炭素を水素ガスを用いて
脱炭するか、あるいは真空中で粉末中の酸素と反応させ
取り除き、その後焼結を行っている。しかし、機械部品
のように、製品の炭素量、酸素量が厳しく限定される部
品を金属粉末射出成形法によって製造する場合、脱脂工
程での炭素量、酸素量の大きな変化が、脱脂後の炭素
量、酸素量のばらつきを大きくするため、焼結体製品の
炭素量、酸素量は、原料粉末での炭素量、酸素量の調整
だけでは精度良く制御できない。そこで、金属粉末射出
成形法において焼結体製品の炭素量、酸素量を制御する
には、脱脂後の調整が必要である。2. Description of the Related Art Conventionally, a metal powder injection molding method is disclosed in
No. 58-153702 (USP 4,415,528), JP-A-63-18310
As disclosed in US Pat. No. 3,836,980 and US Pat. No. 3,45,566 (US Pat. No. 4,996,022), in order to reduce the carbon content and oxygen content of the degreased molded product as much as possible,
After the binder is decomposed, the remaining carbon is decarburized using hydrogen gas, or removed by reacting with oxygen in the powder in a vacuum, and then sintering is performed. However, when parts such as machine parts, in which the amount of carbon and oxygen in products are severely limited, are manufactured by metal powder injection molding, large changes in the amount of carbon and oxygen during the degreasing In order to increase the variation in the amount and the amount of oxygen, the amount of carbon and the amount of oxygen in the sintered product cannot be accurately controlled only by adjusting the amount of carbon and the amount of oxygen in the raw material powder. Therefore, in order to control the amount of carbon and the amount of oxygen in the sintered product in the metal powder injection molding method, adjustment after degreasing is required.
【０００３】脱脂された成形体の炭素量を調整する方法
として、水素と窒素の混合ガスを用いて脱炭する方法
が、雑誌「粉末および粉末治金」vol,38,No6,Aug,1991,
767 に示されている。しかしながら、この方法では、水
素と窒素との混合ガスを使用するが、原理的には、乾燥
水素による脱炭及び脱酸反応において水素ガス分圧を変
化させることにより、反応速度を変え、炭素、酸素量を
調整するものである。従って、ガス流量、試料の総重量
の要因も大きく影響し、実操業上は精度の良い制御は実
現できていない。[0003] As a method of adjusting the carbon content of a degreased compact, a method of decarburizing using a mixed gas of hydrogen and nitrogen is disclosed in the magazine "Powder and Powder Metallurgy", vol. 38, No. 6, August, 1991,
Shown at 767. However, in this method, a mixed gas of hydrogen and nitrogen is used, but in principle, by changing the partial pressure of hydrogen gas in the decarburization and deoxidation reactions with dry hydrogen, the reaction rate is changed, and carbon, It adjusts the amount of oxygen. Therefore, factors such as the gas flow rate and the total weight of the sample also have a large effect, and accurate control has not been realized in actual operation.
【０００４】[0004]
【発明が解決しようとする課題】本発明の目的は、金属
粉末射出成形法において、脱脂された成形体の炭素量、
酸素量を精度良く制御する方法を提供することである。SUMMARY OF THE INVENTION It is an object of the present invention to provide a metal powder injection molding method which comprises:
An object of the present invention is to provide a method for accurately controlling the amount of oxygen.
【０００５】[0005]
【課題を解決するための手段】本発明は、金属粉末を有
機バインダーと混練後、射出成形し、次いで脱脂処理
し、引続き焼結処理する金属粉末射出成形法において、
脱脂された成形体を焼結処理に先立ち、ガス露点が−30
℃以上〜40℃以下、かつ一酸化炭素ガスの含有量が１体
積％以上の水素ガス中、あるいは露点が０℃以下、かつ
炭化水素系ガスの含有量が１体積％以上の水素ガス中で
500℃以上〜閉空孔が形成される温度未満の温度域で熱
処理することを特徴とする金属粉末射出成形法における
脱脂された成形体の炭素量及び酸素量の制御方法であ
り、Fe、Ni、Co、Cu、Mo、Cr及びMnから選ばれた１種ま
たは２種以上からなる金属粉末の射出成形に有利に用い
ることができる。The present invention relates to a metal powder injection molding method in which a metal powder is kneaded with an organic binder, injection-molded, then degreased, and subsequently sintered.
Prior to sintering the degreased compact, the gas dew point was -30.
In a hydrogen gas having a carbon monoxide gas content of 1% by volume or more or a hydrogen gas having a dew point of 0 ° C. or less and a hydrocarbon-based gas content of 1% by volume or more,
A method for controlling the carbon content and the oxygen content of the degreased molded body in the metal powder injection molding method, wherein the heat treatment is performed in a temperature range of 500 ° C. or higher to a temperature lower than the temperature at which closed pores are formed, Fe, Ni, The present invention can be advantageously used for injection molding of one or more metal powders selected from Co, Cu, Mo, Cr and Mn.
【０００６】[0006]
【作用】本発明は、Fe、Ni、Co、Cu、Mo、Cr及びMnの１
種または２種以上の粉末を用いた金属粉末射出成形体か
ら有機バインダーを除去した後、露点を調整した水素と
一酸化炭素あるいは水素と炭化水素系ガスとの混合ガス
を用いて熱処理することにより、炭素量と酸素量を目標
値にする方法である。炭素量、酸素量はガスの露点、混
合ガス比あるいは温度を変化させることで容易に目標の
値に制御することができる。According to the present invention, one of Fe, Ni, Co, Cu, Mo, Cr and Mn is used.
After removing the organic binder from the metal powder injection molded body using the seed or two or more kinds of powders, by performing a heat treatment using a mixed gas of hydrogen and carbon monoxide or hydrogen and a hydrocarbon-based gas whose dew point is adjusted. In this method, the amounts of carbon and oxygen are set to target values. The amounts of carbon and oxygen can be easily controlled to target values by changing the dew point of the gas, the mixed gas ratio or the temperature.
【０００７】本発明の原理は、表面硬化を目的とした浸
炭処理と異なり、試料のＣ及びＯの分布を均一にするこ
とを目的としている。本発明は、雰囲気ガスのカーボン
ポテンシャル、酸素ポテンシャルを制御しながら、空孔
の多い脱脂された成形体のＣ、Ｏ量を制御する方法であ
るが、さらに本発明が対象とする脱脂された成形体は、
相対密度が60％程度になっており、内部に空間が多く、
ガスが内部にまで浸透し、極短時間で炭素量、酸素量の
濃度勾配のない均一な脱脂された成形体が製造できる。The principle of the present invention is to make the distribution of C and O uniform in a sample, unlike carburizing treatment for surface hardening. The present invention is a method for controlling the C and O contents of a degreased molded body having many pores while controlling the carbon potential and oxygen potential of an atmospheric gas. The body is
The relative density is about 60%, there is a lot of space inside,
The gas penetrates into the inside, and a uniform degreased molded body without concentration gradient of carbon and oxygen can be manufactured in a very short time.
【０００８】本発明に用いる金属粉末としては、水素と
一酸化炭素との混合ガスでは露点が室温付近の湿潤水素
を使用しても酸化の起こらない、また比較的還元容易な
Fe、Ni、Co、Cu、Moが、一方、水素と炭化水素系ガスと
の混合ガスでは真空中でＣとＯの反応によりＣ、Ｏを低
減可能なFe、Ni、Co、Cu、Mo、Cr、Mnが適している。こ
れらの粉末としては、高圧水アトマイズ法、還元法、カ
ルボニル法、粉砕等によって製造される金属微粉末およ
びそれらの混合粉末が使用できる。As the metal powder used in the present invention, oxidation does not occur even when wet hydrogen having a dew point around room temperature is used in a mixed gas of hydrogen and carbon monoxide, and it is relatively easy to reduce.
Fe, Ni, Co, Cu, and Mo, on the other hand, in a mixed gas of hydrogen and a hydrocarbon-based gas, Fe, Ni, Co, Cu, Mo, Cr and Mn are suitable. As these powders, fine metal powders produced by a high-pressure water atomization method, a reduction method, a carbonyl method, pulverization, and the like, and mixed powders thereof can be used.
【０００９】有機バインダーとしては、例えばワック
ス、樹脂またはそれらの混合物からなる通常の金属粉末
射出成形用バインダーを用いることができる。成形後、
脱脂処理により有機バインダーを除去するが、その除去
方法は非酸化性雰囲気下での加熱法によるもの、減圧下
での加熱法によるもの、溶媒中、あるいはそれらの組み
合わせによるいずれの方法でもよい。As the organic binder, for example, a usual binder for metal powder injection molding comprising a wax, a resin or a mixture thereof can be used. After molding,
The organic binder is removed by a degreasing treatment. The removing method may be any of a heating method in a non-oxidizing atmosphere, a heating method under reduced pressure, a solvent, or a combination thereof.
【００１０】有機バインダーを除去した、すなわち脱脂
された成形体を、水素と一酸化炭素あるいは水素と炭化
水素系ガスとの混合ガス中で処理し、炭素量、酸素量を
制御する。制御法としては、ガスの露点あるいは混合ガ
ス比を変化させることにより、ガス中のカーボンポテン
シャル、酸素ポテンシャルを目標の炭素量、酸素量に対
応する値に制御する。炭化水素系ガスとしてはメタン、
プロパン、ブタン等が使用できる。The molded body from which the organic binder has been removed, that is, degreased, is treated in a mixed gas of hydrogen and carbon monoxide or hydrogen and a hydrocarbon-based gas to control the amount of carbon and oxygen. As a control method, the carbon potential and oxygen potential in the gas are controlled to values corresponding to the target carbon amount and oxygen amount by changing the dew point of the gas or the mixed gas ratio. Methane as a hydrocarbon gas,
Propane, butane and the like can be used.
【００１１】処理温度としては、まず、 500℃未満の温
度域ではスーティングが起こり、試料表面に多くの煤を
発生させ、炭素が試料内部に入っていかず制御不可能で
ある。また、焼結が進み閉空孔が形成される温度では、
試料内部のガスの拡散が不十分で、反応が極端に遅くな
り、平衡に達する時間が長くなるので、閉空孔が形成さ
れる温度より低い温度で行う方が時間を大きく短縮する
ことができ、有効である。従って、本発明での熱処理温
度は 500℃以上〜閉空孔が形成される温度未満に限定さ
れる。As for the processing temperature, first, in a temperature range of less than 500 ° C., sooting occurs, a large amount of soot is generated on the sample surface, and carbon cannot enter the sample and cannot be controlled. At the temperature at which sintering proceeds and closed pores are formed,
Since the diffusion of gas inside the sample is insufficient, the reaction becomes extremely slow, and the time to reach equilibrium is prolonged, performing at a temperature lower than the temperature at which closed pores are formed can significantly reduce the time, It is valid. Therefore, the heat treatment temperature in the present invention is limited to 500 ° C. or higher to lower than the temperature at which closed pores are formed.
【００１２】また、水素と一酸化炭素の混合ガス系では
ガス中のH2分圧、CO分圧、H2O 分圧を制御するので、一
酸化炭素の含有量が１体積％以上、露点としては−30℃
以上が必要である。それら未満では、ガス中のCO、H2O
分圧が低すぎるため、実操業上不可能である。また、露
点はさらに、酸化反応が起こらない40℃以下の露点域で
行う必要がある。In a mixed gas system of hydrogen and carbon monoxide, since the H 2 partial pressure, the CO partial pressure, and the H 2 O partial pressure in the gas are controlled, the carbon monoxide content is 1% by volume or more, and the dew point Is -30 ° C
The above is necessary. Below that, CO, H 2 O in gas
Since the partial pressure is too low, it is impossible in practical operation. Further, the dew point needs to be further set in a dew point region of 40 ° C. or less where an oxidation reaction does not occur.
【００１３】水素と炭化水素系ガスの混合ガス系ではガ
ス中のH2分圧と炭化水素系ガス分圧を制御するので、同
様に炭化水素系ガスの含有率が１体積％以上が必要であ
り、また露点が０℃よりも高い場合は、炭化水素系ガス
とH2の反応が起こり炉内のＣポテンシャルの制御が困難
になるので、０℃以下の露点域で行う必要がある。次
に、炭素量、酸素量を調整した脱脂された成形体はアル
ゴン、窒素等の不活性ガス下あるいは真空中で焼結す
る。In a mixed gas system of hydrogen and a hydrocarbon gas, since the H 2 partial pressure and the hydrocarbon gas partial pressure in the gas are controlled, the content of the hydrocarbon gas must be 1% by volume or more. If the dew point is higher than 0 ° C., the reaction between the hydrocarbon-based gas and H 2 will occur, making it difficult to control the C potential in the furnace. Next, the degreased molded body in which the amounts of carbon and oxygen are adjusted is sintered under an inert gas such as argon or nitrogen or in a vacuum.
【００１４】以下に本発明を実施例に基づいてより詳細
に述べる。Hereinafter, the present invention will be described in more detail based on embodiments.
【００１５】[0015]
実施例１ カルボニル法によって製造されたそれぞれ平均粒径５μ
ｍのFe粉、Ni粉及びMo粉を混合したFe-2％Ni-1％Mo混合
粉末を有機バインダーと混練して得られた物を射出成形
機を用いて、長さ 100mm×幅10mm×高さ３mmの成形体を
得た。この成形体を窒素中で常温より、１℃／ minの昇
温速度で 600℃まで昇温し脱脂を行った。この脱脂体を
表１に示す組成のガスを用い、 400℃、 500℃、 800℃
および1000℃の温度で熱処理を施した。この熱処理体の
平均炭素量、酸素量と処理時間の関係を図１から図４に
示しており、図中の白ぬきは、試料数（１０ケ）での最
大値、最小値を示す。但し、最大値、最小値の差が0.05
wt％以下では最大値、最小値は示していない。Example 1 5 μm average particle size each produced by the carbonyl method
A mixture of Fe-2% Ni-1% Mo mixed powder of Fe powder, Ni powder and Mo powder of m is kneaded with an organic binder. A molded product having a height of 3 mm was obtained. The molded body was heated to 600 ° C. at a rate of 1 ° C./min from room temperature in nitrogen to perform degreasing. This degreased body was used at a temperature of 400 ° C, 500 ° C, 800 ° C using a gas having the composition shown in Table 1.
And a heat treatment at a temperature of 1000 ° C. The relationship between the average carbon content and the oxygen content of the heat-treated body and the processing time is shown in FIGS. However, the difference between the maximum value and the minimum value is 0.05
Below wt%, the maximum and minimum values are not shown.
【００１６】まず、 400℃で処理した試料ではばらつき
が大きく全く制御できていない。 500℃ならびに 800℃
で処理した試料では、２時間の処理で試料中の炭素量、
酸素量はすでに平衡状態に達しており、そのばらつきも
小さく、精度良く制御できている。それに対し、1000℃
で処理した試料では４時間の処理でも炭素量、酸素量
は、一定値に達していない。これは、焼結が進み閉空孔
が形成され、ガスの移動が極端に遅くなったため、試料
内部と試料表面の炭素量、酸素量が異なり、炭素量、酸
素量の制御ができていないためである。なお、この試料
の閉空孔が形成される温度は1000℃である。First, the sample treated at 400 ° C. has a large variation and cannot be controlled at all. 500 ℃ and 800 ℃
In the sample treated in, the amount of carbon in the sample after 2 hours of treatment,
The amount of oxygen has already reached an equilibrium state, and its variation is small and can be controlled accurately. 1000 ° C
In the sample treated with, the amount of carbon and the amount of oxygen did not reach constant values even after the treatment for 4 hours. This is because the sintering progressed, closed pores were formed, and the gas movement became extremely slow, so the carbon content and oxygen content of the sample and the sample surface were different, and the carbon content and oxygen content could not be controlled. is there. The temperature at which closed pores are formed in this sample is 1000 ° C.
【００１７】[0017]
【表１】 [Table 1]
【００１８】実施例２ 表２に、Fe-2％Cu合金粉末を用い、実施例１と同様に脱
脂体を作製し、その脱脂体を水素と一酸化炭素の混合ガ
ス中で 800℃、２時間熱処理した場合の結果を示す。一
酸化炭素の混合比が０％の時、また、露点が−30〜＋40
℃の範囲にない時は炭素量がばらついたり、酸化を起こ
し、熱処理体の炭素量、酸素量を制御できていない。そ
れに対し、本発明に属するものは、有効に制御ができて
いる。なお、Fe-2％Cu合金鋼粉の閉空孔が形成される温
度は 950℃である。Example 2 A degreased body was prepared in the same manner as in Example 1 using Fe-2% Cu alloy powder shown in Table 2, and the degreased body was heated at 800 ° C. in a mixed gas of hydrogen and carbon monoxide. The result when the heat treatment is performed for an hour is shown. When the mixing ratio of carbon monoxide is 0%, the dew point is -30 to +40.
When the temperature is not in the range of ° C., the amount of carbon varies or oxidation occurs, and the amount of carbon and oxygen in the heat-treated body cannot be controlled. In contrast, those belonging to the present invention can be effectively controlled. The temperature at which closed pores are formed in the Fe-2% Cu alloy steel powder is 950 ° C.
【００１９】[0019]
【表２】 [Table 2]
【００２０】実施例３ 表３に、Fe、Fe-2％Ni、Fe-3％Cr、Fe-18 ％Cr-15 ％Ni
-3Mo-0.5Mn、及びFe-2％Cu合金粉末を用い、実施例１と
同様に脱脂体を作製し、その脱脂体を水素と炭化水素系
ガスの混合ガス中で種々の処理温度で２時間熱処理した
場合の結果を示す。炭化水素系ガスの混合比が 0.5％あ
るいは処理温度が 400℃、1000℃または露点が０℃を超
えるとき、炭素量、酸素量がばらつき、熱処理体の炭素
量、酸素量が制御できていない。それに対し、本発明に
属するものは、有効に制御ができている。なおFe、Fe-2
％Ni、Fe-3％Cr、Fe-18 ％Cr-15 ％Ni-3Mo-0.5Mn粉末の
閉空孔が形成される温度は、それぞれ1000℃、1000℃、
950℃、 950℃である。Example 3 Table 3 shows that Fe, Fe-2% Ni, Fe-3% Cr, Fe-18% Cr-15% Ni
Using a -3Mo-0.5Mn and Fe-2% Cu alloy powder, a degreased body was prepared in the same manner as in Example 1, and the degreased body was mixed at various processing temperatures in a mixed gas of hydrogen and a hydrocarbon-based gas. The result when the heat treatment is performed for an hour is shown. When the mixing ratio of the hydrocarbon-based gas is 0.5% or when the processing temperature exceeds 400 ° C., 1000 ° C. or the dew point exceeds 0 ° C., the carbon amount and oxygen amount fluctuate, and the carbon amount and oxygen amount of the heat-treated body cannot be controlled. In contrast, those belonging to the present invention can be effectively controlled. Fe, Fe-2
% Ni, Fe-3% Cr, Fe-18% Cr-15% Ni-3Mo-0.5Mn The temperature at which closed pores are formed in powder is 1000 ℃, 1000 ℃, respectively.
950 ℃, 950 ℃.
【００２１】[0021]
【表３】 [Table 3]
【００２２】[0022]
【発明の効果】金属粉末射出成形法において、脱脂され
た成形体を水素と一酸化炭素の湿潤混合ガスあるいは水
素と炭化水素系ガスの乾燥混合ガスを用いて処理するこ
とにより、炭素量、酸素量を精度良く制御することがで
きた。According to the metal powder injection molding method, the degreased molded body is treated with a wet mixed gas of hydrogen and carbon monoxide or a dry mixed gas of hydrogen and a hydrocarbon-based gas to thereby reduce the carbon content and oxygen. The amount could be controlled precisely.
【図１】400℃で熱処理した試料の平均炭素量、酸素量
と処理時間との関係を示すグラフである。FIG. 1 is a graph showing the relationship between the average carbon content and oxygen content of a sample heat-treated at 400 ° C. and the processing time.
【図２】500℃で熱処理した試料の平均炭素量、酸素量
と処理時間との関係を示すグラフである。FIG. 2 is a graph showing a relationship between an average carbon amount and an oxygen amount of a sample heat-treated at 500 ° C. and a processing time.
【図３】800℃で熱処理した試料の平均炭素量、酸素量
と処理時間との関係を示すグラフである。FIG. 3 is a graph showing the relationship between the average carbon content and oxygen content of a sample heat-treated at 800 ° C. and the processing time.
【図４】1000℃で熱処理した試料の平均炭素量、酸素量
と処理時間との関係を示すグラフである。FIG. 4 is a graph showing the relationship between the average carbon content and oxygen content of a sample heat-treated at 1000 ° C. and the processing time.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) B22F 3/02,3/10 C04B 35/64──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) B22F 3 / 02,3 / 10 C04B 35/64
Claims (3)
出成形し、次いで脱脂処理し、引続き焼結処理する金属
粉末射出成形法において、脱脂された成形体を焼結処理
するに先立ち、ガス露点が−30℃以上〜40℃以下、かつ
一酸化炭素ガスの含有量が１体積％以上の水素ガス中で
500℃以上〜閉空孔が形成される温度未満の温度域で熱
処理することを特徴とする金属粉末射出成形法における
脱脂された成形体の炭素量及び酸素量の制御方法。In a metal powder injection molding method in which a metal powder is kneaded with an organic binder, injection-molded, then degreased, and subsequently sintered, a gas dew point is obtained before sintering the degreased molded body. Is -30 ° C or higher and 40 ° C or lower, and the content of carbon monoxide gas is 1% by volume or more in hydrogen gas.
A method for controlling the amount of carbon and the amount of oxygen in a degreased molded body in a metal powder injection molding method, wherein heat treatment is performed in a temperature range of 500 ° C. or more to less than a temperature at which closed pores are formed.
出成形し、次いで脱脂処理し、引続き焼結処理する金属
粉末射出成形法において、脱脂された成形体を焼結処理
するに先立ち、ガス露点が０℃以下、かつ炭化水素系ガ
スの含有量が１体積％以上の水素ガス中で 500℃以上〜
閉空孔が形成される温度未満の温度域で熱処理すること
を特徴とする金属粉末射出成形法における脱脂された成
形体の炭素量及び酸素量の制御方法。2. In a metal powder injection molding method in which a metal powder is kneaded with an organic binder, injection-molded, then degreased, and subsequently sintered, a gas dew point is obtained prior to sintering the degreased molded body. Is 500 ° C or higher in a hydrogen gas having a temperature of 0 ° C or lower and a hydrocarbon gas content of 1% by volume or more.
A method for controlling the amount of carbon and the amount of oxygen in a degreased molded body in a metal powder injection molding method, wherein a heat treatment is performed in a temperature range lower than a temperature at which closed pores are formed.
Ni、Co、Cu、Mo、Cr及びMnから選ばれた１種または２種
以上からなることを特徴とする金属粉末射出成形法にお
ける脱脂された成形体の炭素量及び酸素量の制御方法。3. The metal powder according to claim 1, wherein the metal powder is Fe,
A method for controlling the amount of carbon and the amount of oxygen in a degreased molded body in a metal powder injection molding method, comprising one or more selected from Ni, Co, Cu, Mo, Cr and Mn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10469393A JP2743974B2 (en) | 1992-06-29 | 1993-04-30 | Control method of carbon content and oxygen content of degreased molded body in metal powder injection molding method |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4-170859 | 1992-06-29 | ||
| JP17085992 | 1992-06-29 | ||
| JP10469393A JP2743974B2 (en) | 1992-06-29 | 1993-04-30 | Control method of carbon content and oxygen content of degreased molded body in metal powder injection molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0673406A JPH0673406A (en) | 1994-03-15 |
| JP2743974B2 true JP2743974B2 (en) | 1998-04-28 |
Family
ID=26445103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10469393A Expired - Fee Related JP2743974B2 (en) | 1992-06-29 | 1993-04-30 | Control method of carbon content and oxygen content of degreased molded body in metal powder injection molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2743974B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5506407A (en) * | 1993-12-21 | 1996-04-09 | Minnesota Mining & Manufacturing Company | High resolution high speed film measuring apparatus and method |
| CN111992723B (en) * | 2020-09-10 | 2023-10-10 | 安徽德诠新材料科技有限公司 | Preparation method of high-heat-conductivity metal radiating fin |
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1993
- 1993-04-30 JP JP10469393A patent/JP2743974B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0673406A (en) | 1994-03-15 |
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