本文選題：圓筒印花鎳網(wǎng) + 顯微結(jié)構(gòu)�。� 參考：《蘭州理工大學(xué)》2017年碩士論文

【摘要】：圓筒印花鎳網(wǎng)是圓網(wǎng)印花機中的關(guān)鍵性部件,在印染過程中印花鎳網(wǎng)發(fā)生斷裂將影響印花的質(zhì)量和效率。因而圓筒印花鎳網(wǎng)的使用壽命直接影響圓網(wǎng)印花機的正常生產(chǎn),制備高性能的圓筒印花鎳網(wǎng)是獲得較大經(jīng)濟效益的關(guān)鍵。目前國際上圓筒印花鎳網(wǎng)質(zhì)量最好的當(dāng)屬荷蘭STORK公司,該公司的圓筒印花鎳網(wǎng)結(jié)構(gòu)好、性能穩(wěn)定、使用壽命長并且能夠進行多次使用。國內(nèi)生產(chǎn)圓筒印花鎳網(wǎng)的廠家有60多家。但是到目前為止我們對圓筒印花鎳網(wǎng)結(jié)構(gòu)和性能的了解很少,僅僅局限于鎳網(wǎng)的開孔率、厚度、表面光澤度等方面。本文通過化學(xué)成分分析、X射線衍射、掃描電鏡等材料分析方法對不同目數(shù)圓筒印花鎳網(wǎng)進行顯微結(jié)構(gòu)分析,并對其力學(xué)性能進行對比。結(jié)果表明:圓筒印花鎳網(wǎng)中鎳含量達99.69%且為典型的面心立方結(jié)構(gòu);隨著鎳網(wǎng)目數(shù)的增加,鎳網(wǎng)的網(wǎng)孔形狀由六邊形結(jié)構(gòu)轉(zhuǎn)變?yōu)閳A形結(jié)構(gòu),并且鎳網(wǎng)的網(wǎng)孔大小和網(wǎng)孔間距均減小;STORK鎳網(wǎng)的一鍍鍍層和二鍍鍍層均發(fā)生了分層現(xiàn)象,并且鍍層出現(xiàn)環(huán)狀生長更致密,而國內(nèi)鎳網(wǎng)均只在二鍍鍍層發(fā)生分層現(xiàn)象,環(huán)狀生長相對疏松;不同種類的圓筒印花鎳網(wǎng)的晶粒取向不同,國內(nèi)A公司125目鎳網(wǎng)和STORK公司125目鎳網(wǎng)晶粒無明顯的擇優(yōu)取向。國內(nèi)A公司除了125目鎳網(wǎng)以外的其他目數(shù)鎳網(wǎng)均呈明顯的(200)晶面擇優(yōu)取向,國內(nèi)B公司鎳網(wǎng)105目和125目鎳網(wǎng)均表現(xiàn)為(200)晶面擇優(yōu)取向;國內(nèi)A公司六種試樣斷口形貌均由大小不等的等軸韌窩組成,105目和125目鎳網(wǎng)試樣出現(xiàn)了獨特的扁平狀斷口,說明該試樣的一鍍鍍層和二鍍鍍層的結(jié)合性良好,塑性較好;由于氧化膜的存在,一鍍鍍層與二鍍鍍層之間的結(jié)合性能較差,導(dǎo)致拉伸過程中鍍層界面產(chǎn)生開裂,影響鎳網(wǎng)性能。根據(jù)圓筒鎳網(wǎng)的剛度計算方法,選擇了最佳測量長度為300mm,并且對不同目數(shù)鎳網(wǎng)進行剛度測量,國內(nèi)A公司125目鎳網(wǎng)的剛度值為K=1.299×10-2 N·mm-1,優(yōu)于其他目數(shù)鎳網(wǎng)。
[Abstract]:Nickel screen for cylindrical printing is a key part in circular screen printing machine. The quality and efficiency of printing will be affected by the breakage of nickel screen in printing and dyeing process. Therefore, the service life of cylindrical nickel screen directly affects the normal production of circular screen printing machine, and the key to obtain greater economic benefit is to prepare high performance nickel screen for cylindrical printing. At present the best quality of cylinder printing nickel screen in the world is the Dutch company STORK. Its cylinder printing nickel screen has good structure, stable performance, long service life and can be used many times. Domestic production cylinder printing nickel screen manufacturers have more than 60. But so far we know little about the structure and performance of nickel mesh in cylindrical printing, which is limited to the opening ratio, thickness and surface gloss of nickel mesh. In this paper, the microstructure of nickel screen for cylinder printing with different mesh numbers is analyzed by means of chemical composition analysis, X-ray diffraction and scanning electron microscope, and its mechanical properties are compared. The results show that the nickel content in the nickel screen for cylindrical printing is 99.69% and is a typical face-centered cubic structure, and with the increase of nickel mesh number, the mesh shape of nickel mesh changes from hexagonal structure to circular structure. The size of the mesh and the distance between the meshes of the nickel mesh are reduced. Both the single plating and the second plating layer of the nickel mesh are delaminated, and the ring growth of the coating is more compact, while in the domestic nickel mesh the delamination occurs only in the second plating layer. The ring growth is relatively loose, and the grain orientation of different kinds of nickel screen is different, but there is no obvious preferred orientation between A company 125mesh nickel mesh and STORK company 125mesh nickel mesh. In China, all the nickel mesh except 125 mesh nickel mesh have obvious preferred orientation of crystal plane, and domestic B company nickel mesh 105 mesh and 125 mesh nickel mesh all show the preferred orientation of crystal plane. The fracture morphology of six kinds of specimens in A company in China is composed of equiaxed dimples of different sizes and 125 mesh nickel mesh specimens with unique flat fracture surface, which indicates that the joint property of one plating coating and two plating coating is good, and the plasticity is good. Due to the existence of oxide film, the bonding property between the first and second plating coatings is poor, which leads to the cracking of the interface of the coating during the tensile process, which affects the properties of the nickel mesh. According to the stiffness calculation method of cylindrical nickel mesh, the optimum measuring length is 300mm, and the stiffness of different mesh nickel mesh is measured. The stiffness of 125mesh nickel mesh of A company in China is 1.299 脳 10 ~ (-2) N m ~ (-1), which is superior to other nickel mesh.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TS194.3;TG146.15

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