激光技术
激光技術
격광기술
LASER TECHNOLOGY
2015年
4期
462-465
,共4页
激光技术%复合涂层%原位合成%抗氧化性
激光技術%複閤塗層%原位閤成%抗氧化性
격광기술%복합도층%원위합성%항양화성
laser technique%composite coating%in-situ synthesis%oxidation resistance
为了提高材料的高温抗氧化性，采用激光原位合成的方法制备了TiC－TiB2／Fe复合涂层，并进行了理论分析和实验验证，取得了复合涂层的相组成、显微组织及抗氧化性能数据。结果表明，涂层物相主要由α－Fe，TiC， TiB2和（ Fe，Cr）7 C3等组成，细小的方块状TiC颗粒和长条状TiB2均匀弥散分布于涂层基体上。经600℃恒温氧化60h后，TiC－TiB2／Fe复合涂层表面形成了连续致密的氧化膜，其主要由细小的Fe2O3，FeCr2O4，（Cr，Fe）2O3、金红石型TiO2以及Al2 O3等球状颗粒组成，颗粒排列紧密，各氧化物形成热力学条件是满足的。复合涂层在600℃的恒温氧化动力学曲线呈抛物线型，在最初的10h内氧化增重速度较快，之后曲线趋于平缓。60h后其增重仅为0．75mg／cm2，抗氧化性能约是半钢的15倍。此研究结果对提高材料高温抗氧化性有一定的指导意义。
為瞭提高材料的高溫抗氧化性，採用激光原位閤成的方法製備瞭TiC－TiB2／Fe複閤塗層，併進行瞭理論分析和實驗驗證，取得瞭複閤塗層的相組成、顯微組織及抗氧化性能數據。結果錶明，塗層物相主要由α－Fe，TiC， TiB2和（ Fe，Cr）7 C3等組成，細小的方塊狀TiC顆粒和長條狀TiB2均勻瀰散分佈于塗層基體上。經600℃恆溫氧化60h後，TiC－TiB2／Fe複閤塗層錶麵形成瞭連續緻密的氧化膜，其主要由細小的Fe2O3，FeCr2O4，（Cr，Fe）2O3、金紅石型TiO2以及Al2 O3等毬狀顆粒組成，顆粒排列緊密，各氧化物形成熱力學條件是滿足的。複閤塗層在600℃的恆溫氧化動力學麯線呈拋物線型，在最初的10h內氧化增重速度較快，之後麯線趨于平緩。60h後其增重僅為0．75mg／cm2，抗氧化性能約是半鋼的15倍。此研究結果對提高材料高溫抗氧化性有一定的指導意義。
위료제고재료적고온항양화성，채용격광원위합성적방법제비료TiC－TiB2／Fe복합도층，병진행료이론분석화실험험증，취득료복합도층적상조성、현미조직급항양화성능수거。결과표명，도층물상주요유α－Fe，TiC， TiB2화（ Fe，Cr）7 C3등조성，세소적방괴상TiC과립화장조상TiB2균균미산분포우도층기체상。경600℃항온양화60h후，TiC－TiB2／Fe복합도층표면형성료련속치밀적양화막，기주요유세소적Fe2O3，FeCr2O4，（Cr，Fe）2O3、금홍석형TiO2이급Al2 O3등구상과립조성，과립배렬긴밀，각양화물형성열역학조건시만족적。복합도층재600℃적항온양화동역학곡선정포물선형，재최초적10h내양화증중속도교쾌，지후곡선추우평완。60h후기증중부위0．75mg／cm2，항양화성능약시반강적15배。차연구결과대제고재료고온항양화성유일정적지도의의。
In order to improve the high-temperature oxidation resistance of materials , TiC-TiB2/Fe composite coating was in-situ synthesized by laser cladding .The data of phase , microstructure and oxidation resistance of composite coating were obtained after theoretical analysis and experimental verification .The results indicate that the phases of composite coating are mainly composed of α-Fe, TiC, TiB2 and ( Fe, Cr ) 7 C3 etc.The fine block-shaped TiC particles and strip-shaped TiB2 disperse on the coating substrate uniformly .The continuous and compact oxidation film is formed on the surface of TiC-TiB2/Fe composite coating after being oxidized isothermally at 600℃for 60h.The oxidation film consists of fine and spherical oxides such as Fe2O3, FeCr2O4, ( Cr, Fe)2O3, rutile TiO2 and Al2O3 and so on, arranged closely. Thermodynamic conditions of oxide formation are satisfied .The oxidation kinetic curve of composite coating at constant temperature of 600℃ is parabolic.The rate of oxidation weight gain is much higher during the initial 10h, and then becomes slower gradually .The oxidation weight gain is 0.75mg/cm2 after being oxidized for 60h.The oxidation resistance of composite coating is 15 times higher than that of semi-steel.The results have some guiding significance to improve the high-temperature oxidation resistance of materials .
