Sicp / al matrix composites, with 5, 15 and 25 % volume fraction of sic particles, were prepared by vacuum hot - pressing sintering processing in this paper. based on mechanics properties, sem observation and energy dispersive x - ray analysis, the interface reaction phenomenon of sicp / al composites made by vacuum hot - pressing sintering, as well as the reinforcement and fracture mechanisms of this composite were analyzed. the dynamic responses of sipc / al composites were studied by a split hopkinson high - speed pressure bar impact system which strain rate was from quasistatic state strain rate ( 3. 3 10 - 3s - 1 ) to dynamic state strain rate ( 5. 2 103 s - 1 )
本研究以武裝直升飛機防護裝甲材料為研究對象,採用真空
熱壓粉末冶金燒結工藝制備了含sic顆粒體積分數分別為5 、 15和25的sic顆粒增強鋁基復
合材料,結
合其力學性能、掃描電鏡和界面微區能譜分析結果,分析了sic _ p al復
合材料的真空燒結過程中的界面現象,以及材料增強和斷裂機理,並利用hopkinson高速
壓桿沖擊實驗系統對其從靜態到動態(應變率為3 . 3 10 ~ ( - 3 ) s ~ ( - 1 ) 5 . 2 10 ~ 3s ~ ( - 1 ) )的
壓縮破壞響應進行了研究,分析了不同體積分數sic _ p al復
合材料高應變率
壓縮載荷下,材料的變形和微觀損傷機理,以及利用高速沖擊空氣炮測定了改復
合材料制備剃度復
合板的穿透性能。
The subject for different process technology and surface treatment of crank takes tracking checkout for its internal stress, analyses relation of jumping measurement, deformation measurement, recovery measurement and stress change, finds the reason and usual law of jumping overproof of crank. through cold pressure alignment, hot pressure alignment, support aged alignment and so on methods for 42crmo steel crank, the subject checks change of stress in the process of alignment and change of tissue and property after alignment for crank, and gives comprehensive evaluation for every alignment technology, then give safe and feasible technology parameter
本課題主要是對不同加工工藝及不同表面處理過程的曲軸,對其內應力進行跟蹤檢測,分析各工藝過程中跳動量、變形量、恢復量與應力改變的關系,找出曲軸跳動量超差的原因和一般規律。通過對42crmo鋼曲軸進行「常溫
壓力校直」 、 「
熱壓力校直」 、 「支撐時效校直」等方法的校直,檢測校直過程中曲軸應力的變化及校直后組織和性能的改變,進而對各校直工藝進行綜
合評價,給出安全可行的工藝參數。
Is 76 thousand sq. meter, which located in the yangjia economic development area in the south jinzhou district in the joint venture of development area and jinzhou district with the 16000 htousand dollars total investment amount and 600000 stere meter output per year. now it forms the japan advanced check up way and machine with japan 35 layers hot - press mainframe, and the product line of " plane, dry, cut " veneer product line. we won the high prize and credits for our advanced technology and high quality
它採用日本的先進設備及世界上先進的生產工藝,現已形成以日本產九尺旋切機為主機的"刨干剪"單板加工生產線,以日本產三十五層
熱壓機為主機,引進日本先進的化驗檢測儀器及檢測方法,從而使產品質量深為廣大用戶信賴,產品等級符
合日本jpic美國ihpa英國bsi等先進國家標準及中國gb9846和gb13009標準
The age hardening characteristic of as - cast cu20ni20mn and cu20ni35mn alloys and the interface characteristic between the alloy and cast tungsten carbide were studied, and on the basis of this study, composites of cu - ni - mn alloy reinforced with different volume fraction ( 0 - 45vol. % ) and different size ( 42 - 362 m ) of cast tungsten carbide particles were made by vacuum hot - pressing liquid sintering technology. pin on disk two body abrasion tests have been performed with different size of sic abrasive under different loads
本文研究了鑄態cu20ni20mn和cu20ni35mn
合金的時效硬化特性及其與鑄造碳化鎢的界面特性,並在此基礎上以不同尺寸( 42 362 m )的鑄造碳化鎢顆粒為增強體,採用真空
熱壓液相燒結技術制備了不同顆粒含量( 0 45vol . )的鑄造碳化鎢顆粒增強cu - ni - mn
合金基復
合材料;以不同粒度的sic為磨料,在不同載荷條件下利用銷?盤磨損試驗機測試了復
合材料的二體磨料磨損性能。
Method for determination of the adhesion of autoclave tape to tray wrap material
用於盤碟包裝材料的
熱壓帶粘
合力的測定方法
Cooperation project diamond circular saw blades with cool and hot pressing
冷
熱壓金剛石圓鋸片
合作項目
The blade inner channel cooling is a complex convection - conduction coupling problem. this thesis build a three - dimension. compressible turbulence model, and give a general solve method. with the geometrical model of the glossily rectangle straight channel, the rectangle straight channel with in - line arrays disturb plates, the rectangle straight channel with staggered arrays disturb plates, the rectangle straight channel with slant disturb plates, this thesis compute the flow and heat transfer condition when the cold air path though these channels, and gain the temperature field, pressure field, velocity filed, in addition. this thesis also analyze the influence of the different channel height, the different channel materials, the different channels, and gain the function relation between he nusselt number, friction factor and reynolds number. this thesis is emphasis on the new heat transfer enhancement structure, that is, disturb plates, with the comparison with the glossily channel and channel with pin fins, the heat transfer enhancement effect of the former is better, and the conclusion can be used in the design of aircraft blade
葉片內部通道冷卻是一個復雜的對流?導
熱耦
合傳
熱問題,本文在分析葉片內部通道冷卻的流動與傳
熱情況的基礎上,建立了三維、可
壓縮紊流的物理模型,得到了通用的求解辦法;利用不帶擾流片的矩形直通道、帶順排擾流片矩形直通道、帶叉排擾流片、帶傾斜擾流片的矩形直通道的幾何模型,計算了冷卻空氣通過這幾種通道時的流動與換
熱情況,得到了各種不同情況下計算區域的溫度場、
壓力場、速度場;在此基礎上分析了不同的通道高度、不同的葉片通道材質對葉片內部通道冷卻的影響,並整理得到了各種通道形式下,努謝爾數和阻力因子與雷諾數的函數關系;本文重點研究了新型的葉片內部通道冷卻強化傳
熱措施?帶擾流片的內部冷卻通道的強化傳
熱效果,通過與光滑矩形直通道、帶針肋通道的冷卻效果的比較,表明了這種新型鮚構的優勢,對于葉片內部通道冷卻結構的設計可以起到指導的作用。
Fesi2 - based semiconductors have been studied due to its good performance, low cost and potential application in power generation using waste heat. state - of - the - art techniques such as levitation melting, rapid solidification and hot uniaxial pressing ( hup ) were used for sample preparation in the present work. the phase transformation, micro structure and transport properties of the materials have been analysed with xrd, sem / edx, raman spectroscopy as well as thermoelectric characterization
在綜
合評述國內外
熱電材料研究新進展的基礎上,本文以懸浮熔煉、快速凝固和單軸
熱壓等制備工藝為技術特徵,以mn或al摻雜fesi _ 2基
合金為研究對象,採用xrd 、 sem / eds 、 raman光譜以及材料
熱電性能測試等分析表徵手段,系統研究相變過程、微觀結構特徵及其對材料
熱電性能的影響。
Study on limn2o4 synthesized by hot - pressing method and on lithium getting off the products
4的
熱壓合成及鋰脫嵌研究
Research on modeling of hot embossing polymeric microfluidic chip
聚
合物微流控晶元
熱壓成型的建模研究
Performance for a piezoresistive transducer pressure sensor to thermal and pressure environments can be predicted by finite element method. a simplified 1 / 8 model, considering silicon dioxide and nitride process as well as stack anodic bonding and adhesive bonding processes, was developed. the fem results were found to be comparable to experimental data. case studies suggested that pyrex stack induces certain amount of non - linearity, while it isolates hard epoxy nonlinear effect. flexible epoxy bonding or soft adhesive bonding is preferred to the packaging process. the viscoelasticity and viscoplasticity of bonding material will result in hysteresis and drift errors to sensor output. however, soft adhesive s influence on sensor can be ignored under relative stable environments. more over, detailed design and process information will help to improve modeling application
熱、
壓環境下
壓阻變換
壓力傳感器的性能可以通過有限元方法預測.這里研究了簡化的1 / 8模型,模型考慮了二氧化硅和氮化硅生成過程及堆陽極鍵
合和膠粘結
合過程.結果發現有限元預測結果和實驗數據具有可比性.範例研究表明,硼硅堆導致產生一定的非線性,但它隔離了硬環氧樹脂的非線性.在包裝過程中最好使用柔性環氧黏
合或軟黏膠性結
合.黏
合材料的黏彈性和黏塑性將會導致傳感器輸出的滯后和漂移誤差.然而,在相對穩定的環境下,軟黏
合劑對傳感器的影響可以忽略.此外,詳細的設計和過程信息有助於提高模型的適用性
In this paper, nanosized al2o3 ceramic particles were chose as reinforcing phase. enhanced with ultrasonic wave the particles were covered with copper using method by electroless plating, the copper - matrix composite was developed by hot - press sintering process of the composite powder. the composition, microstructure, hardness, density and dry sliding wear property of the new material have been studied
研究路線為:選用納米級al _ 2o _ 3陶瓷顆粒作為增強相,在超聲波的環境中用化學鍍的方法完成對納米al _ 2o _ 3陶瓷顆粒表面的金屬銅包覆,採用
熱壓燒結成型技術以復
合粉末為原料制備成納米al _ 2o _ 3陶瓷顆粒增強銅基復
合材料,研究分析復
合材料的成分、組織結構、硬度以及緻密度,對試樣進行了干滑動摩擦磨損實驗。
The research on the properties of the copper nanoparticles / paraffin thermosensitive composite materials reveals : the thermal sensitivity and the thermal expansion are " aried by the cempress moulding in heat condition with the change in density ; the thermal sensitivity is varied by the mechanical milling with the change in particle shape and particle dimension ; the mass ration of copper and paraffin in the composite materials also affects the thermal sensitivity, the thermal expansion and the thermal stability with the change in copper nanoparticles and paraffin interface
對復
合顆粒進行
壓力成型后制備的復
合材料進行性能測試分析表明:
熱壓成型工藝通過改變復
合材料的緻密度來影響材料的
熱敏性和
熱膨脹性。高能球磨工藝主要通過改變球磨時間使銅粒形狀和粒徑發生變化來影響復
合材料的
熱敏性,以及改變銅粉和石蠟的質量比使納米銅粒和石蠟的復
合界面發生變化來影響材料的
熱敏性、
熱膨脹性和
熱穩定性。
Insulated cables and flexibles cords for installations. halogen - free non - scheathed cables with improved characteristics in case of fire, type c1 or c2 with thermoplastic or cross - linked synthetic insulation, of rated voltages up to and includingy 450 750 volt
設備用絕緣電纜和軟導線.額定電
壓450 750v的無齒素非鎧裝改進耐火性的c1型
熱塑
合成纖維絕緣電纜
An experiment was conducted to study the effects of hot - pressing temperature on properties of wheat straw - plastic composites made from wheat straw and recycled polyethylene ( pe ) using isocyanate as adhesive through multi - factor orthogonal experiment and single - factor experiment
摘要通過正交試驗和單因子試驗,以麥秸和廢舊聚乙烯塑料為原料,使用異氰酸酯膠黏劑壓制麥秸塑料刨花板,分析熱壓溫度對麥秸聚乙烯復合材料性能的影響。