TW200808982A - Iron-based powder - Google Patents

Abstract

An atomised pre-alloyed iron-based powder which comprises by weight% 10.5-30 Cr 3-15 Al 5-20 Cu max 0.1 C max 0.2 N max 3.0 Mn max 2.5 Si max 3.0 Mo balance essentially only iron and unavoidable impurities.

Description

200808982 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種具有好的抗高溫氧化性之經霧化的 鐵基粉末，更特別關於一種與鉻及鋁預合金的粉末。 【先前技術】 已發現典型包含Fe及10_30〇/〇Cr及bWWAi的習知鐵 基合金（所謂的FeCrA1合金）由於其好的抗氧化性及可在溫 度高如120(M40〇t;下使用，其在多種高溫應用中高度有 用。因此，此材料已使用在電阻元件之製造中及作為在汽 車觸媒中的載體材料。由於其鋁成分，此合金能夠在高溫 下及於多數氣氛中形成一由實質上乂2〇3組成之不能滲透 且黏著性的表面氧化物。此氧化物保護金屬對抗進一步氧 化及亦對抗許多其它腐蝕形成，諸如碳化、硫化等等。 但疋在粉末冶金術中的問題為FeCrAi粉末難以燒結， 此由於事貫上氧化鋁比氧化鉻難還原。透過擴散形成的燒 結頸由此氧化鋁層所減弱，若可克服此問題則會有利。 US 597〇3〇6描述出一種藉由熱均壓（mp)從FeCrA1粉 末來製造抗南 >显的塑形零件之方法。 DE 4235141描述出一種從熱加壓以FeCrA1合金為主 的柘末來製得夺件之製造方法，其中此粉末初始曝露至含 氧氧氛以繞著顆粒產生氧化鉻保護層。 US 6761751描述出一種藉由氣體霧化來製造FeCrA1 材料的方法，其中除了包括鐵（Fe)、鉻（Cr)及鋁（A1)之外， 6 200808982 Λ ' 此材料亦包括較少分量的一或多種下列材料：鉬（Mo)、铪 (Hf)、鍅（Zr)、紀（Y)、氮（N)、碳（C)及氧（0)。 US 6569221描述出一種粉末冶金的FeCrA1合金，其 包含（以重量％計）少於0.02%碳、多於〇〇且<=〇5%矽、多 於 0·0 且 <—0 2%猛、10·0-40·0%路、<==〇·6。/。鎳、<=Q 〇1〇/〇 銅、2·〇·10·〇%鋁；量為 mo 之 Se、γ、La、200808982 IX. Description of the Invention: [Technical Field] The present invention relates to an atomized iron-based powder having good high temperature oxidation resistance, and more particularly to a powder pre-alloyed with chromium and aluminum. [Prior Art] It has been found that a conventional iron-based alloy (so-called FeCrA1 alloy) typically containing Fe and 10_30〇/〇Cr and bWWAi has good oxidation resistance and can be used at temperatures as high as 120 (M40〇t; It is highly useful in a variety of high temperature applications. Therefore, this material has been used in the manufacture of resistive elements and as a carrier material in automotive catalysts. Due to its aluminum composition, the alloy can be formed at high temperatures and in most atmospheres. An impermeable and adhesive surface oxide consisting essentially of 〇2〇3. This oxide protects the metal against further oxidation and also against many other corrosion formations, such as carbonization, vulcanization, etc. But in powder metallurgy The problem is that FeCrAi powder is difficult to sinter, which is difficult to reduce due to the fact that alumina is more difficult to reduce than chromium oxide. The sintered neck formed by diffusion is weakened by the aluminum oxide layer, which is advantageous if it can overcome this problem. US 597〇3〇6Description A method for producing a south-resistant shaped part from FeCrA1 powder by thermal pressure equalization (mp). DE 4235141 describes a crucible based on FeCrA1 alloy under thermal compression. Finally, a method of making the article is obtained, wherein the powder is initially exposed to an oxygen-containing oxygen atmosphere to produce a chromium oxide protective layer around the particles. US 6,761,751 describes a method for producing FeCrA1 material by gas atomization, which includes In addition to iron (Fe), chromium (Cr) and aluminum (A1), 6 200808982 Λ ' This material also includes less than one or more of the following materials: molybdenum (Mo), helium (Hf), helium (Zr), (Y), nitrogen (N), carbon (C), and oxygen (0). US 6569221 describes a powder metallurgy FeCrAl alloy comprising (by weight percent) less than 0.02% carbon, more than 〇〇 <=〇5%矽, more than 0·0 and <-0 2% violent, 10·0-40·0% way, <==〇·6. /. Nickel, <=Q 〇1 〇/〇 copper, 2·〇·10·〇% aluminum; the amount of Mo is Se, γ, La,

Hf、V、Nb及Ta的一或多種；剩餘為鐵及無法避免的雜 質。 ’ 【發明内容】 社本發明之目標為提供一種金屬粉末，其當以習知的燒 1方法（例如無壓燒結、冷壓成形或溫壓成形）燒結時可二 的燒結結構，且此燒結構件具有好的高溫氧化性質。 。更特定的是，本發明之目標為提供一種包含多於1〇 5重量 %鉻及3-15重量％鋁的不鏽鐵粉，但是此粉末比在先述2 藝中所熟知的材料較易燒結。 旦。此目標由一種經霧化而與1〇·5_3〇重量。重 里:A1及5_2〇重量0/心預合金的鐵基粉末所達成。藉由 預，金此粉末與Cu，可以f知的燒結方法來燒結—構^， 且維持此亦具有優良的抗高溫氧化性之燒結構件令人 之材料性質。 w 曰再者，在第二具體實施例中，已建議一種與W弘扣 =r、3七重量%A1、5，重量%c重量观 頂合金的鐵基粉末。 7 200808982 本發明之粉末藉由提供一鐵與合金元素之熔融物、夂 霧化此熔融物、藉此從霧化的小滴在固化後形成粉末來： 造較佳。 & 可藉由下列方式從本發明之粉末製造出燒結構件·· 提供包含本發明之粉末的燒結材料；b)從此燒結材料形^ 生坯；及C)在還原或中性氣氛中’於大氣壓或低於大氣壓 下、及在溫度高於1100。(：處燒結此生坯。One or more of Hf, V, Nb, and Ta; the remainder is iron and unavoidable impurities. SUMMARY OF THE INVENTION The object of the present invention is to provide a metal powder which can be sintered when sintered by a conventional firing method (for example, pressureless sintering, cold press forming or warm press forming), and this is sintered. The structural member has good high temperature oxidation properties. . More specifically, it is an object of the present invention to provide a stainless iron powder comprising more than 1 5% by weight of chromium and 3 to 15% by weight of aluminum, but this powder is easier to sinter than the materials well known in the prior art. . Dan. This target consists of a kind of atomized and 1〇·5_3〇 weight. Re-introduction: A1 and 5_2 〇 weight 0 / core pre-alloyed iron-based powder. By pre-sintering, this powder and Cu can be sintered by a sintering method which is known, and maintains the material properties of the sintered member which also has excellent high-temperature oxidation resistance. Further, in the second embodiment, an iron-based powder having an alloy of W yoke = r, 3.7 wt% A1, 5, wt% c weight has been proposed. 7 200808982 The powder of the present invention is preferably formed by providing a melt of iron and alloying elements, atomizing the melt, thereby forming a powder from the atomized droplets after solidification. & A sintered member can be produced from the powder of the present invention by: providing a sintered material comprising the powder of the present invention; b) forming a sintered material therefrom; and C) in a reducing or neutral atmosphere At or below atmospheric pressure, and at temperatures above 1100. (: The green body is sintered.

此燒結材料可例如經無壓燒結、冷壓成形或溫壓成形。 關於冷壓成形或溫壓成形’此燒結材料為—黏結劑… 或潤滑劑與本發明之粉末的混合物。 —冷壓成形在溫度低於10CTC下進行，較佳在壓實屢力 範圍100-1000百萬帕（MPa)内。 溫壓成形在溫度範圍100_20(rc内進行，較佳在壓實 壓力範圍300-1000百萬帕内。 、 進行無壓燒結乃沒有壓實生迷。於此，此燒結材料可 為一黏結劑及/或潤滑劑與本發明之粉末的混合物，但是同 樣可為此粉末自身(即’沒有混合此粉末與黏結劑及/或潤 滑劑）。例如當不使用黏結劑時，可將此燒結材料傾入一形 狀中’在包含此形狀之後將此燒結材料塞入燒結爐中。例 如:可藉由無壓燒結本發明之粉末來製造具有優良的抗高 溫氧化性之過濾器。 再者，已經顯示出可從本發明之粉末製造出具有優良 的抗高溫氧化性之燒結構件，此燒結構件具有燒結密度大 於6.5克/立方公分、抗張強度大於5〇〇百萬帕及屈服強度 8 200808982 t 、 大於400百萬帕。 【實施方式】 本發明係關於一種預合金的鐵基粉末，其包含多於$ 重I /〇鉻和疋i的鋁及鋼。如上所述，FeCrAl合金已顯 不出具有在高溫下優良的抗氧化性，但是不幸的是其難以 在大氣壓中或低於大氣壓（真空）燒結。此為為何利用Hip 方法來製造以FeCrA1粉末為主之化合物的理由(如描述在 例如US 5970306中）。藉由亦與銅預合金來減低燒結問題 及改良燒結結構的結果（與沒有銅的參考材料比較銅成 分顯示出促進形成燒結頸，如可從伴隨的金相學照片看 見。我們相信此效應由於氧化銘層由液化的銅打散而發 生。亦測試混合銅及FeCrA1粉末，但是在此實例中燒結 未明顯改良。 本發明之粉末藉由製得鐵與想要的合金元素之熔融物 ”得°之後霧化此㈣物’藉此從霧化的小滴在固化之 後形成粉末。根據習知的技術（例如氣體或水霧化）進行霧 化事貫上南度較佳的是水霧化此熔融物混合物，因為水 霧化的粉末比氣體霧化的粉末易緻密。當粉末由於水霧化 形成時’㈣末氧化及在此粉末顆粒之表面上形成薄的氧 化鉻及氧化鋁層。 如下列彳田述般測试鋁含量的有效範圍，其推斷鋁含量 應該大於3。/。’且銘含量較佳應大於5%以獲得想要的抗氧 化性。但是，若銘含量變成太高時，熔點減低及此材料在 9 200808982 2溫下喪失強度。再者，此可假定為@量多於—定量時抗 氧化1·生不曰a 加，且進_步增加銘含量將僅稱微改善 ^氧化性。因此根據本發明，銘含量之上限設定為15重 里/。，及具有鋁含量低於12重量％事實上較佳。 曰從描述在下列的測試來推出銅含量之界限。因此，銅 …亥夕於5重里％以促進形成燒結頸及提供-具有好 =南溫氧化性之燒結構件。再者，cu含量應該低於2〇 具有較南的Cu含量之粉末對某些應用來說可能非 吊有用，但是它們未在本發明的範圍内。 $ !顯示出Fe_Cu相圖’但是咸信Cu將以類似的方 〜旦 减夕/打放乳化鋁層，咸信必需形成一 =的液相’即（叫為有興趣的區域。因為此圖形為 妒e-Cu糸統’從其所擷取的資訊僅可使用作為指導方針。 =興趣的是在燒結期間形成之液相量。需要形成液相 :打政氧化銘，但是過量的液相會讓此結構在燒結期間瓦 …斤形成的液相量與化學組成及燒結溫度相關。 =液體形成影響之元素為銅。此為為何在氧化測試之前 依樣品的銅含量施加不同燒結溫度。 當然其它合金元素亦可有興趣。特別是 =構時’此粉末亦可與沃斯田體形成以（特別是辞）預Γ 至’但是亦可為錄同等物雜。㉟了為沃斯田體形成; ^錄亦已熟知在抗氧化性上具有有益的效應，此在轉 之欲應用上當然想要。若欲在此粉 錦 ”农好錄含量的區間為㈣重量％。鏟亦可為額外的= 200808982 4田體形成合金元素，較佳的錳含量低於3重量％。 苇之下不使用始，因為其比較昂貴。 『軚乜保持奴含量低，因為碳具有造成晶粒間腐蝕的傾 "七為為何較佳碳含量應該少於〇·1重量％碳的緣故。 :::的樣品中，碳含量為約〇·〇2重量％或較低。保持氮 —曰可犯低亦較佳，氮含量低於0重量％較佳。 實施例1This sintered material can be formed, for example, by pressureless sintering, cold press forming or warm press forming. Regarding cold press forming or warm press forming 'this sintered material is - a binder... or a mixture of a lubricant and the powder of the present invention. - Cold forming is carried out at a temperature below 10 CTC, preferably in the range of 100-1000 MPa (MPa). The warm press forming is carried out in a temperature range of 100_20 (rc, preferably in the range of compaction pressure of 300-1000 MPa). The pressureless sintering is not compacted. Here, the sintered material may be a binder. And/or a mixture of a lubricant and a powder of the invention, but the same can be used for the powder itself (ie 'no mixing of the powder with the binder and/or lubricant). For example, when no binder is used, the sintered material can be used. Pour into a shape to insert the sintered material into the sintering furnace after containing the shape. For example, a powder having excellent high temperature oxidation resistance can be produced by pressureless sintering of the powder of the present invention. It is shown that a sintered member having excellent high temperature oxidation resistance can be produced from the powder of the present invention, the sintered member having a sintered density of more than 6.5 g/cm 3 , a tensile strength of more than 5 MPa and a yield strength of 8 200808982 t , greater than 400 MPa. [Embodiment] The present invention relates to a prealloyed iron-based powder comprising aluminum and steel in excess of weight I / chrome and 疋i. As described above, FeCrAl alloy has Display It has excellent oxidation resistance at high temperatures, but unfortunately it is difficult to sinter at atmospheric pressure or below atmospheric pressure (vacuum). This is the reason why the Hip method is used to manufacture compounds based on FeCrA1 powder (as described in For example, in US 5,970,306), the result of reducing the sintering problem and improving the sintered structure by pre-alloying with copper (the copper composition is shown to promote the formation of a sintered neck compared to a reference material without copper, as can be seen from the accompanying metallographic photographs. It is believed that this effect occurs because the oxidized layer is broken up by the liquefied copper. The mixed copper and FeCrA1 powders are also tested, but the sintering is not significantly improved in this example. The powder of the present invention is produced by the iron and the desired alloying elements. The melt "atomizes the (four) material after the °" to thereby form a powder from the atomized droplets after solidification. The atomization is preferably performed according to a conventional technique (for example, gas or water atomization). It is water atomizing the melt mixture because the water atomized powder is denser than the gas atomized powder. When the powder is formed by water atomization, '(4) is oxidized and A thin layer of chromium oxide and aluminum oxide is formed on the surface of the powder particles. The effective range of the aluminum content is tested as described in the following table, and it is inferred that the aluminum content should be greater than 3% and the content of the content should preferably be greater than 5%. Obtain the desired antioxidant properties. However, if the content of the melamine becomes too high, the melting point is reduced and the material loses its strength at the temperature of 9 200808982 2 . Again, this can be assumed to be more than the amount of anti-oxidation. It is not necessary to add a, and the increase of the content of the _ step will only be called micro-improvement oxidative. Therefore, according to the present invention, the upper limit of the ing content is set to 15 mph, and the aluminum content is less than 12% by weight. 。 From the test described below, the limit of copper content is introduced. Therefore, copper is used at a weight of 5 liters to promote the formation of a sintered neck and to provide a sintered member having good oxidizing properties at south temperature. Further, the cu content should be less than 2 Å. Powders having a souther Cu content may be useful for some applications, but they are not within the scope of the present invention. $ ! shows the Fe_Cu phase diagram 'but the salt letter Cu will be similar to the square ~ denier / play the layer of emulsified aluminum, the salt must form a liquid phase 'that is (called the area of interest. Because this figure For the 妒e-Cu system, the information obtained from it can only be used as a guideline. = Interest is the amount of liquid phase formed during sintering. The liquid phase needs to be formed: the political phase, but the excess liquid phase The amount of liquid phase formed by this structure during sintering is related to the chemical composition and sintering temperature. The element that affects the formation of liquid is copper. This is why different sintering temperatures are applied depending on the copper content of the sample before the oxidation test. Other alloying elements may also be of interest. In particular, the composition of the powder can also be formed with the Worth field (especially the word) to the 'but can also be recorded as equivalent. 35 for the Worth field Forming; ^ has also been known to have a beneficial effect on antioxidant properties, which of course is desired in the application of the application. If you want to use this product in the range of (4) weight%, the shovel can also be Extra = 200808982 4 The body forms an alloying element, Good manganese content is less than 3% by weight. It is not used under 苇 because it is relatively expensive. 軚乜 軚乜 Keep the slave content low, because carbon has a tendency to cause intergranular corrosion. Less than 〇·1% by weight of carbon. In the sample of :::, the carbon content is about 〇·〇2% by weight or less. Keeping nitrogen-曰 is low and better, and the nitrogen content is less than 0% by weight. Preferably, embodiment 1

一藉由製侍鐵與想要的合金元素之熔融物來製得七種不 5十務化而具有纟i之組成物的粉末。之後，此溶融物 經水霧化’藉此從霧化的小滴在固化之後形成粉末。根據 習知的水霧化技術進行霧化。透過—提供最大直徑75微 米之網柵來引出所產生的粉末。 對每種粉末，製備燒結的測試樣品。讓燒結的測試樣 品及含有31〇B組成物（25重量％心+2〇重量％恥+ 25重量 似卜剩餘部A Fe)之參考樣品接受描述在下列的高溫氧化 測試。選擇㈣應作為參考，因為已熟知其擁有好的 抗高溫氧化性。 藉由將有興趣的粉末填入一形狀（直徑10毫米及厚度 2毫米)中，接著平順化表面而沒有壓實粉末來製造測試樣 品及參考樣品。此程序提供具有高比面積（約45%多孔洞性） 的樣品。 ’於依Cii含量而定的溫 在100%氫氣氛中，根據下表 度下燒結測試樣品30分鐘： 5%CuA powder of seven compositions which have a composition of 纟i is prepared by making a molten iron of the desired alloying element. Thereafter, the melt is atomized by water' thereby forming a powder from the atomized droplets after solidification. Atomization is carried out according to conventional water atomization techniques. The resulting powder is extracted by providing a grid with a maximum diameter of 75 microns. For each powder, a sintered test sample was prepared. The sintered test sample and the reference sample containing the 31 Å B composition (25 wt% heart + 2 〇 wt% shame + 25 wt% remaining A Fe) were subjected to the following high temperature oxidation test. Choice (4) should be used as a reference because it is well known to have good resistance to high temperature oxidation. Test samples and reference samples were prepared by filling the powder of interest into a shape (diameter 10 mm and thickness 2 mm) followed by smoothing the surface without compacting the powder. This procedure provides samples with a high specific area (approximately 45% porosity). The temperature was determined according to the Cii content. In a 100% hydrogen atmosphere, the test sample was sintered for 30 minutes according to the following table: 5% Cu

1150°C 2008089821150°C 200808982

* 10%Cu 1320〇C 15%Cu 135〇〇c* 10%Cu 1320〇C 15%Cu 135〇〇c

20%Cu 1320〇C 在_。氫氣氛中，於mot：下燒結參考樣品3〇分鐘。 所製備的測試及參考樣品之後準備好用於高溫 試。 在實驗室爐（Lenton 12/50/300)中，於溫度8〇〇t：下在 空氣中進行氧化測試。將天平（Mettler T〇led〇 ae26〇)連結 鲁 至電腦以自動儲存資料。藉由將樣品放置在樣品支架上可 同時測試六個樣品，且在每次測試運轉時二個樣品為參考 樣品。 在引進爐中之前稱重樣品。進行短時間循環，每個循 環由2分鐘加熱及3〇秒冷卻組成，此對將樣品冷卻至低 於150C已足夠。重覆此循環15次，導致在爐中3〇分鐘。 在加熱區域中，每3〇分鐘之後稱重樣品及儲存每次的重 量增益。在加熱區域中2〇小時之後停止測試。 12 20080898220% Cu 1320〇C at _. The reference sample was sintered at mot: for 3 minutes in a hydrogen atmosphere. The prepared test and reference samples are then ready for high temperature testing. Oxidation tests were carried out in air in a laboratory furnace (Lenton 12/50/300) at a temperature of 8 〇〇t:. Connect the balance (Mettler T〇led〇 ae26〇) to the computer to automatically store the data. Six samples can be tested simultaneously by placing the sample on the sample holder, and two samples are reference samples for each test run. The sample was weighed before being introduced into the furnace. For a short period of time, each cycle consisted of 2 minutes of heating and 3 seconds of cooling, which was sufficient to cool the sample to less than 150C. Repeat this cycle 15 times, resulting in 3 minutes in the furnace. In the heated zone, the sample is weighed every 3 minutes and the weight gain is stored each time. The test was stopped after 2 hours in the heated zone. 12 200808982

結果顯示出φ、I 觀看具有ΑβΓ5 7的抗氧化性比參考粉末8更差。 可看見〜含量：5,5重量%的樣品(即，粉末2、4'5及Ο ^^ ,b； ,7i/〇e!^" ：° 4 *%(^^ 4) 最高的抗氧化性。Cu含量：：5重里%(粉末2)時獲得 抗氧化性”如且二進步增加至20重量%(粉末”； 。果如具有10重量％Cu(粉末4)的粉末。 果。^ 3里丨5 /。關於抗鬲溫氧化性提供最好結 ’指示出在 1。可看見 但是，在燒結期間’粉末5相當大地收縮 Cu含1大於約20重量％時形成太多液相。 〜比較粉末4與粉末3及比較粉末2與粉末 攸5.5重量％增加A1含量稍微增加抗氧化性。 13 200808982 實施例2 下表顯示 附註 在不同氧化溫度下進一步測試粉末2及 出相對於參考31 0B的重量增加。 表2_ 測试溫 粉末3 粉末2 度[°C ]相對於參考的相對於參考的 重量增加（％) 重量增加 800 46 24 850 43 22 900 21 21 950 14 14 1000 _20 13 "表顯示出在包含CuA1的樣品與參考樣品間之抗 氧化性差異在溫度高於800°C下更明顯。再者，具有A1含 量5.5%及Cu含量15%的組成與具有1〇%A1及i〇%Cu之 組成比較似乎具有較好的抗氧化性。 實施例3 為了評估加入Cu《分關於燒結密度、抗張強度及屈 服強度之效應’比較四種不同粉末。此些粉末為如在實施 例1及2中之水霧化的粉末。將此粉末與ι% Αα_χι 合。在壓實壓力_百萬帕下將混合物壓實成抗張測試棒。 在132(TC下’於1GG%氫氣氛中燒結測試棒3()分鐘。測量 燒結密度、抗張強度及屈服強度。結果顯示在表3中。 14 200808982 表3 化學組成重量％，剩餘 燒結密度[克 抗張強度 屈服強度 部分Fe /立方公分] [百萬帕] [百萬帕] 22Cr+5.5Al+10Cu 6.87 582 522 22Cr+5.5Al(參考） 5.74 295 259 22Cr+18Ni + 5.5Al + 8Cu 6.70 507 412 22Cr+18Ni + 5.5Al(參考） 4.96 87 69 表3顯示出若此粉末與Cu預合金時，含A1的Cr或 Cr-Ni不鏽鋼粉末之密度及機械性質相當大地增加。此指 示出更大改良燒結活性。 在抗張測試棒上進一步進行金屬檢驗。參見圖2 A、2B 及圖3 A、3B的金相學照片，其明確顯示出將Cu摻入以含 A1的Cr或Cr-Ni為基礎之不鏽鋼粉末，相當大地提高材 料之燒結。圖2A顯示出包含22(^+5.5八1+10(^+剩餘部分 Fe的測試棒之金相學照片及圖2B顯示出包含22Cr+5.5Al + 剩餘部分Fe之對應參考測試棒之金相學照片。圖3 A顯示 出包含22Cr+5.5Al+18Ni + 8Cu+剩餘部分Fe的測試棒之金 相學照片及圖B顯示出包含22Cr+5.5Al+18Ni+剩餘部分Fe 之對應的參考測試棒之金相學照片。 【圖式簡單說明】 圖1顯示出Fe-Cu相圖；及 圖2A顯示出包含Cr、Al、Cu及Fe的測試棒之金相 15 200808982 . 學照片；及 圖2B顯示出包含Cr、A1及Fe的測試棒之金相學照 片；及 圖3 A顯示出包含Cr、Al、Cu、Ni及Fe的測試棒之 金相學照片；及 圖3B顯示出包含Cr、A卜Ni及Fe的測試棒之金相 學照片。 • 【主要元件符號說明】 無 參 16The results showed that the oxidation resistance of φ, I observed with ΑβΓ5 7 was worse than that of the reference powder 8. Can be seen ~ content: 5,5 wt% of the sample (ie, powder 2, 4'5 and Ο ^ ^, b;, 7i / 〇e! ^ " : ° 4 *% (^ ^ 4) highest resistance Oxidizing property: Cu content: 5 cc% (powder 2) when oxidation resistance is obtained" and the progress is increased to 20% by weight (powder); fruit such as powder having 10% by weight of Cu (powder 4). ^ 3里丨5 /. The best knot for the anti-temper temperature oxidation provides 'indicated at 1. It is visible, however, that during the sintering, the powder 5 shrinks considerably and Cu contains more than about 20% by weight to form too much liquid phase. ~Comparative powder 4 with powder 3 and comparative powder 2 with powder 攸 5.5 wt% increase A1 content slightly increase oxidation resistance. 13 200808982 Example 2 The following table shows the notes to further test powder 2 at different oxidation temperatures and relative to the reference 31 0B weight increase. Table 2_ Test temperature powder 3 powder 2 degrees [°C] relative to the reference weight increase relative to the reference (%) Weight increase 800 46 24 850 43 22 900 21 21 950 14 14 1000 _20 13 The " table shows the difference in oxidation resistance between the sample containing CuA1 and the reference sample at temperatures above 800 °C Obviously, the composition having an A1 content of 5.5% and a Cu content of 15% seems to have better oxidation resistance as compared with the composition having 1% by mass of A1 and i〇% Cu. Example 3 In order to evaluate the addition of Cu The effects of sintered density, tensile strength and yield strength 'compare four different powders. These powders are water atomized powders as in Examples 1 and 2. This powder is combined with ι% Αα_χι. The mixture was compacted into a tensile test rod under MPa. The test rod 3 () was sintered in a 1GG% hydrogen atmosphere at 132 °C. The sintered density, tensile strength and yield strength were measured. The results are shown in the table. 3 中. 14 200808982 Table 3 Chemical composition wt%, residual sintered density [gram tensile strength yield strength part Fe / cubic centimeter] [million kPa] [million kPa] 22Cr+5.5Al+10Cu 6.87 582 522 22Cr+5.5 Al (Reference) 5.74 295 259 22Cr+18Ni + 5.5Al + 8Cu 6.70 507 412 22Cr+18Ni + 5.5Al (Reference) 4.96 87 69 Table 3 shows that if the powder is pre-alloyed with Cu, Cr or Cr-containing A1 The density and mechanical properties of Ni stainless steel powder have increased considerably. This indicates a greater change. Good sintering activity. Further metal inspection on tensile test bars. See Figure 2 A, 2B and Figure 3 for metallographic photographs of A and 3B, which clearly show that Cu is incorporated into Cr or Cr-Ni containing A1. The stainless steel powder considerably increases the sintering of the material. Figure 2A shows a metallographic photograph of a test stick comprising 22 (^ + 5.5 八 1 + 10 (^ + remaining Fe) and Figure 2B showing a corresponding reference test stick containing 22Cr + 5.5 Al + remaining Fe. 3 A shows the metallographic photograph of the test rod containing 22Cr+5.5Al+18Ni + 8Cu+ remaining Fe and FIG. B shows the metallographic photograph of the corresponding reference test rod containing 22Cr+5.5Al+18Ni+ remaining Fe. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a Fe-Cu phase diagram; and FIG. 2A shows a metallographic 15 of a test rod containing Cr, Al, Cu, and Fe. 200808982. Photographs; and FIG. 2B shows Cr, A1, and Fe. Metallographic photographs of the test bars; and Figure 3A shows metallographic photographs of test bars containing Cr, Al, Cu, Ni, and Fe; and Figure 3B shows metallographic photographs of test bars containing Cr, A, Ni, and Fe. [Main component symbol description] No reference 16

Claims (1)

200808982 十、申請專利範圍： 1 · 一種經霧化的預合金鐵基粉末，其以重量❶計包含 下列： 10.5-30 Cr 3_15 A1 5-20 Cu 最多0.1 C 最多0.2 N • 最多3.0 Μη 最多2.5 Si 最多3.0 Mo 剩餘部分基本上僅有鐵及無法避免的雜質。 2·如申請專利範圍第1項之粉末，其中A1含量範圍在 5-12重量％内。 3·如申請專利範圍第1或2項之粉末，其中Cu含量範 圍在7-17重量％内。 4·如申請專利範圍第1或2項之粉末，其中Cr含量範 圍在15-30重量％内。 5 ·如申請專利範圍第4項之粉末，其中Cr含量範圍在 20-30重量％内。 6 ·如申請專利範圍第1或2項之粉末，其中該粉末進 一步包含8-2〇重量。 7.如申請專利範圍第1或2項之粉末，其中該粉末藉 由水霧化製造。 17 200808982 8·-種製造水霧化的預合金鐵基粉末之方法，該粉末 以重量％計包含下列： 10.5-30 Cr 3-15 A1 5_20 Cu 最多0.1 C 最多0.2 N200808982 X. Patent application scope: 1 · An atomized prealloyed iron-based powder containing the following by weight: 10.5-30 Cr 3_15 A1 5-20 Cu up to 0.1 C up to 0.2 N • up to 3.0 Μη up to 2.5 The remainder of Si up to 3.0 Mo is essentially iron and unavoidable impurities. 2. The powder of claim 1 wherein the A1 content is in the range of 5 to 12% by weight. 3. A powder according to claim 1 or 2, wherein the Cu content is in the range of 7 to 17% by weight. 4. A powder according to claim 1 or 2, wherein the Cr content is in the range of 15 to 30% by weight. 5. A powder according to item 4 of the patent application, wherein the Cr content is in the range of 20 to 30% by weight. 6. A powder according to claim 1 or 2, wherein the powder further comprises 8-2 Torr. 7. The powder of claim 1 or 2, wherein the powder is produced by water atomization. 17 200808982 8 - A method for producing a water atomized prealloyed iron-based powder comprising, by weight %, 10.5-30 Cr 3-15 A1 5_20 Cu up to 0.1 C up to 0.2 N 最多3.0 Μη 最多2.5 Si 最多3.0 Mo 剩餘部分基本上僅有鐵及無法避免的雜質； s“广：法包括提供鐵與合金元素的熔融物，水霧化此熔 t ，藉此從霧化的小滴在固化之後形成粉末。 9·如中請專利範圍帛8項之方法，其中該鐵基粉末進 步包含8-20重量％Ni。 10·—種製造燒結構件的方法，其包括： )徒供一包含水霧化的預合金 其以重量％計包含下列： 10.5-30 Cr 3-15 A1 5-20 Cu 最多0.1 C 最多0.2 N 最多3.0 Mn 18 200808982 - 最多2.5 Si 最多3.0 Mo 剩餘部分基本上僅有鐵及無法避免的雜質； b)從該燒結材料形成一生坯，·及 C)在還原或中性氣氛中、於大氣壓或低於大氣壓下、 及在溫度高於11001處燒結此生坯。 η.如申請專利範圍第1()項之方法，其_在a)中所提 供的燒結材料為-潤滑劑及/或黏結劑與水霧化的預合金鐵 ，基粉末之混合物。 12. 如申請專利範圍第u項之方法，其中在b)中該生 述藉由冷屢成形該混合物形成’其中該屋實壓力範圍在 100-1000百萬帕内及溫度低於1〇(rc。 13. 如申請專利範圍第u項之方法，其中在b)中該生 述藉由溫壓成形該混合物形成，其中該壓實壓力範圍在 300-1000百萬帕内及溫度範圍在1〇〇_2〇〇ec内。 14. 如申請專利範圍第1〇項之方法，其中在甸中所提 供的燒結材料僅有水霧化的預合金鐵基粉末。 15. 如申請專利範圍第"或14項之方法，其中該生坯 經塑形而沒有壓實該生坯。 16. —種從如申請專利範圍第1〇至“項之任何一項的 方法所製造的燒結構件，其中該構件之燒結密度大於6 $ 克/立方公分。 17. 一種從如申請專利範圍第10至14項之任何一項的 方法所製造的燒結構件，其中該構件之抗張強度大於5〇〇 19 200808982 ， 百萬帕。 18·—種從如申請專利範圍第10至14項之任何一項的 方法所製造的燒結構件，其中該構件之屈服強度大於400 百萬帕。 Η•一、圖式： 如次頁Up to 3.0 Μη up to 2.5 Si up to 3.0 Mo The remainder is essentially only iron and unavoidable impurities; s "wide: the method consists of providing a melt of iron and alloying elements, which atomizes this melting t, thereby The droplets form a powder after solidification. 9. The method of claim 8, wherein the iron-based powder advance comprises 8-20% by weight of Ni. 10 - A method of manufacturing a sintered component, comprising: A pre-alloy comprising water atomization comprising the following in weight percent: 10.5-30 Cr 3-15 A1 5-20 Cu up to 0.1 C up to 0.2 N up to 3.0 Mn 18 200808982 - up to 2.5 Si up to 3.0 Mo remainder Basically only iron and unavoidable impurities; b) forming a green body from the sintered material, and C) sintering the raw material in a reducing or neutral atmosphere at atmospheric or subatmospheric pressure and at a temperature higher than 11001 η. The method of claim 1 (), wherein the sintered material provided in a) is a mixture of a lubricant and/or a binder and a water atomized prealloyed iron, a base powder. 12. The method of applying for patent scope item u Wherein in b) the preparation is formed by cold forming the mixture, wherein the house pressure ranges from 100 to 1000 MPa and the temperature is below 1 〇 (rc. 13. as claimed in the scope of claim u The method wherein, in b), the preparation is formed by warm-forming the mixture, wherein the compaction pressure ranges from 300 to 1000 MPa and the temperature ranges from 1 〇〇 2 〇〇 ec. The method of claim 1, wherein the sintered material provided in the kitchen is only a water atomized prealloyed iron-based powder. 15. The method of claim 2, wherein the green body The green body is not compacted. 16. A sintered member produced by the method of any one of the preceding claims, wherein the sintered density of the member is greater than 6 gram / Cubic centimeters. 17. A sintered component produced by the method of any one of claims 10 to 14, wherein the tensile strength of the member is greater than 5 〇〇 19 200808982, MPa. A sintered member manufactured by the method of any one of claims 10 to 14, wherein the member has a yield strength of more than 400 MPa. Η•1, schema: as the next page 2020