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4J29鈦及鎳基合金-其它合金
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.index-module_wrapperBg__OKK1h{background-image:url(https://baikebcs.bdimg.com/baike-common/sdks/drawer_bg_new.png);background-position:top;background-repeat:no-repeat;background-size:cover;height:871px;left:0;position:absolute;top:0;width:100%}.index-module_drawerHand__aRhcO{align-items:center;background-image:url(https://baikebcs.bdimg.com/baike-common/sdks/drawer_hand_bg.png);background-position:50%;background-repeat:no-repeat;background-size:contain;cursor:pointer;display:flex;height:72px;justify-content:center;position:fixed;right:0;top:50%;transform:translateY(-36px);transition:all .2s ease-in;width:20px}.index-module_drawerHand__aRhcO .index-module_taskLogo__71Tj5{height:66px;position:absolute;right:30px;top:0;width:66px}.index-module_drawerHand__aRhcO.index-module_open__qMl5O{right:480px}.index-module_reverse__OKr6k{transform:rotate(180deg)}網(wǎng)頁新聞貼吧知道網(wǎng)盤圖片視頻地圖文庫資訊采購百科百度首頁登錄注冊進(jìn)入詞條全站搜索幫助首頁秒懂百科特色百科知識專題加入百科百科團(tuán)隊權(quán)威合作個人中心收藏查看我的收藏0有用+10柯伐合金播報討論上傳視頻奧氏體金相組織同義詞4j29（合金類型）一般指柯伐合金本詞條由“科普中國”科學(xué)百科詞條編寫與應(yīng)用工作項目 審核 ?？路ズ辖鹗菉W氏體金相組織，它在很寬的溫度范圍內(nèi)（-80-450℃）其熱膨脹性與一些高硅硼玻璃和高Al2O3,陶瓷的熱膨脹性比較吻合匹配，因而被廣泛地用來制作高真空玻璃一金屬氣密封接器件，由于它有良好的封接、焊接和加工性能，柯伐合金在電真空工業(yè)中用于高頻功率管、整流管、X射線管的底座和引出線等。但是柯伐合金的導(dǎo)電性和導(dǎo)熱性差，它的導(dǎo)熱系數(shù)約為一般不銹鋼的一半。中文名柯伐合金外文名Kovar學(xué) 科冶金工程領(lǐng) 域冶煉類 型奧氏體金相組織應(yīng) 用電真空元件，發(fā)射管等目錄1定義2復(fù)合材料3應(yīng)用4電鍍層定義播報編輯柯伐合金來制作電子元件的外引線時常用的鍍層進(jìn)行保護(hù)。但是這種外引線易發(fā)生應(yīng)力腐蝕斷裂，在鍍層存在缺陷時，鍍金，鍍鎳層均促進(jìn)柯伐合金的應(yīng)用力腐蝕開裂，其斷裂機(jī)理為氫開裂，減少鍍層缺陷可大大減少外引起的應(yīng)力腐蝕斷裂。該合金在20~450℃范圍內(nèi)具有與硬玻璃相近的線膨脹系數(shù)和相應(yīng)的硬玻璃能進(jìn)行有效封接匹配，和較高的居里點以及良好的低溫組織穩(wěn)定性，合金的氧化膜致密，容易焊接和熔接，有良好可塑性，可切削加工，廣泛用于制作電真空元件，發(fā)射管，顯像管，開關(guān)管，晶體管以及密封插頭和繼電器外殼等 [1]。復(fù)合材料播報編輯柯伐合金與無氧銅復(fù)合材料，盡管兩者膨脹系數(shù)差異很大，但如果芯材無氧銅占總體積18%左右，則膨脹行為主要受外層柯伐合金主宰，銅芯對復(fù)合線總體積膨脹性能影響不大。這種復(fù)合材料外皮可與玻璃、陶瓷的熱膨脹性相匹配，芯材用具有高導(dǎo)電、高導(dǎo)熱的無氧銅制成，具有高塑性的無氧銅可減弱對柯伐合金所受的應(yīng)力，這樣可大大地改善封接性能，提高溫度變化的適應(yīng)性和可靠性?？路ズ辖鹋c銅復(fù)合材料的導(dǎo)熱系數(shù)是各向異性的，當(dāng)熱流方向與軸向相平行時，相當(dāng)于一個并聯(lián)“電路”。這時復(fù)合線內(nèi)外層具有相同的溫度梯度，大部分熱流則通過導(dǎo)熱系數(shù)高的內(nèi)層。這種復(fù)合材的導(dǎo)熱系數(shù)和導(dǎo)電率比柯伐合金提高4-5倍，甚至比鉑金屬的導(dǎo)熱系數(shù)還好，克服了單一柯伐合金的導(dǎo)熱和導(dǎo)電性差的缺點。這種復(fù)合材料兼有柯伐合金和無氧銅的優(yōu)點，而且有高的氣密性，是電真空工業(yè)中理想的封接材料 [2]。應(yīng)用播報編輯柯伐合金冶金產(chǎn)品已廣泛用于汽車、摩托車、內(nèi)燃機(jī)車、飛機(jī)、石油鉆井機(jī)械、化纖紡織機(jī)械、手表、醫(yī)療器械、軍工等領(lǐng)域。為客戶解決了材料性能、制造工藝等許多方面的難題，產(chǎn)品深受廣大用戶歡迎。由于柯伐合金導(dǎo)電和導(dǎo)熱性不好，使電真空管輸出功率受到限制。隨著現(xiàn)代技術(shù)的飛躍發(fā)展，繼電器產(chǎn)品的不斷更新?lián)Q代，小型化、大功率（通過50-200A）玻瑞密封用的接線柱（全封閉壓縮機(jī)的重要元件之一）材料的需求量必將日益增多。要獲得具有專門性能的材料是非常重要的，用一種金屬或合金往往不能滿足所需要的性能，生產(chǎn)小型、大功率密封繼電器的廠家是用定膨脹合金與無氧銅芯通過焊接辦法實現(xiàn)的。但這種方法工藝復(fù)雜，氣密性、玻璃封接后的電性能都難以保證產(chǎn)品要求。在這種情況下，研制了用無氧銅作芯材外覆柯伐合金的復(fù)合材料，復(fù)合后的柯伐合金與無氧銅復(fù)合材料的線膨脹系數(shù)與柯伐合金相近，這不僅保持了柯伐合金的優(yōu)點，而且大大提高了導(dǎo)熱和導(dǎo)電性能，使管子輸出功率大大提高。經(jīng)過真空技術(shù)研究所的測定和生產(chǎn)繼電器廠家的試用，證明這種復(fù)合材料已達(dá)到較高的水平，它是一種新型的電真空密封材料，具有高的氣密性、高導(dǎo)電和高導(dǎo)熱的綜合性能，將成為電真空工業(yè)中的重要封接材料之一 [3]。電鍍層播報編輯柯伐合金在現(xiàn)代電子工業(yè)中被大量用于半導(dǎo)體器件及集成電路的制造等方面。作為外引線，為了防止腐蝕的發(fā)生及保證可焊性，通常采用鍍層作為保護(hù)，大大減少了外引線的均勻腐蝕。但隨著電子工業(yè)的發(fā)展，晶體管引線脆斷現(xiàn)象（斷腿）在國內(nèi)外時常發(fā)生。這種斷裂隱蔽性大。導(dǎo)致整機(jī)的可靠性大大降低，因此危害很大。對引線斷裂的研究發(fā)現(xiàn)：電鍍層質(zhì)量對斷裂的發(fā)生有著決定性的影響 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柯伐合金管斷腿的金相分析初步探討[J]. 電子產(chǎn)品可靠性與環(huán)境試驗, 1991(1):22-23.","index":1,"uuid":"gnb2hmcpc4"},{"type":3,"text":"劉國祿. 柯伐合金-無氧銅復(fù)合材料及其性能[J]. 稀有金屬材料與工程, 1988(5):36-38.","index":2,"uuid":"gnb2hmcpdy"},{"type":3,"text":"高進(jìn). 柯伐合金應(yīng)力腐蝕與電氐層質(zhì)量的關(guān)系研究[J]. 表面技術(shù), 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4J294J29合金又稱可伐(Kovar)合金。該合金在20～450℃具有與硅硼硬玻璃相近的線膨脹系數(shù)，居里點較高，并有良好的低溫組織穩(wěn)定性。合金的氧化膜致密，能很好地被玻璃浸潤。且不與汞作用，適合在含汞放電的儀表中使用。是電真空器件主要密封結(jié)構(gòu)材料。應(yīng)用概況與特殊要求 該合金是國際通用的典型的Fe-Ni-Co硬玻璃封接合金。經(jīng)航空工廠長期使用，性能穩(wěn)定。主要用于電真空元器件如發(fā)射管、振蕩管、引燃管、磁控管、晶體管、密封插頭、繼電器、集成電路的引出線、底盤、外殼、支架等的玻璃封接。在應(yīng)用中應(yīng)使選用的玻璃與合金的膨脹系數(shù)相匹配。根據(jù)使用溫度嚴(yán)格檢驗其低溫組織穩(wěn)定性。在加工過程中應(yīng)進(jìn)行適當(dāng)?shù)臒崽幚?，以保證材料具有良好的深沖引伸性能。當(dāng)使用鍛材時應(yīng)嚴(yán)格檢驗其氣密性。合金組織結(jié)構(gòu) 合金按1.5規(guī)定的熱處理制度處理后，再經(jīng)-78.5℃冷凍，大于等于4h不應(yīng)出現(xiàn)馬氏體組織。但當(dāng)合金成分不當(dāng)時，在常溫或低溫下將發(fā)生不同程度的奧氏體(γ)向針狀馬氏體(α)轉(zhuǎn)變，相變時伴隨著體積膨脹效應(yīng)。合金的膨脹系數(shù)相應(yīng)增高，致使封接件的內(nèi)應(yīng)力劇增，甚至造成部分損壞。影響合金低溫組織穩(wěn)定性的主要因素是合金的化學(xué)成分。從Fe-Ni-Co三元相圖中可以看到，鎳是穩(wěn)定γ相的主要元素，鎳含量偏高有利于γ相的穩(wěn)定。隨合金總變形率增加其組織越趨向穩(wěn)定。合金成分偏析也可能造成局部區(qū)域的γ→α相變。此外晶粒粗大也會促進(jìn)γ→α相變。 PRODUCT PARAMETERS 產(chǎn)品參數(shù) 4J29化學(xué)成分CMnSiPSCuCrMoNiCoFe28.516.80.030.50.300.0200.0200.200.200.2029.517.8余量在平均線膨脹系數(shù)達(dá)到標(biāo)準(zhǔn)規(guī)定條件下，允許鎳、鈷含量偏離表規(guī)定范圍。鋁、鎂、鋯和鈦的含量各不大于0.10%，其總量應(yīng)不大于0.20%。 上一頁：K94610
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