The results indicate that polyborazine precursor prepared at 150℃ for 10 h and propylamine/isopropylamine molar ratio 2:1, could possess nearly linear molecule skeleton and he prone to melt spinnability. When melt at 90℃, the precursor fibers are prepared with average diameter 10-20μm and BC1.27 N1.52 H structure. After curing process and sintered in NH3 at 1200℃, the near-stoichiometric BN fibers was obtained, which proved this precursor is apt for preparation of BN fibers.

結(jié)果表明，當(dāng)正丙胺／異丙胺摩爾比為2：1欧美456正片，聚合溫度為150℃不卡能看的黄色网站一区二区，反應(yīng)時間為10h時，合成產(chǎn)物具有近似線性分子結(jié)構(gòu)深夜在线网址在线观看网站大全，熔點為90℃两人作爱视频在线看免费，具有良好的成絲性，可獲得平均直徑10~20μm久草久草视频，組成為BC1.27N1.52H的先驅(qū)體纖維，先驅(qū)體纖維再經(jīng)不熔化處理及1200℃氨氣高溫鍛燒等工藝可獲得近化學(xué)計量比的氮化硼纖維。

Samples for sintering were precalcined at 600℃ and isostatically compacted at a pressure of 180MPa. The sintered body has a dense microstructure with a relative density of 98.6%.

植入體內(nèi)后亚洲可以免费在线观看的黄色网址，在體液的作用下久久免费A级毛片高清在钱，鈣和磷會游離出材料表面，被機體組織所吸收日韩特黄A片毛多片免费观看，并能與人體骨骼組織形成化學(xué)鍵結(jié)合玖玖在线视频，生長出新的組織。

The carbon/carbon throat and copper sintered tungsten nozzle were wound in the middle of longtail nozzle insulation .

整體成型的長尾管通過復(fù)合纏繞方式將碳/碳喉襯與鎢滲銅噴管組件黏結(jié)包裹在尾管絕熱層內(nèi)部亚洲Av人妻无码天堂。

Objective:To evaluate the cytotoxicity of twice sintered machinable nano-meter zirconia ceramic for dental use.

目的：對二步燒結(jié)牙科可切削牙科納米氧化鋯陶瓷細(xì)胞毒性進行初步評價欧美黑白性爱视频。

May erode its microstructure. A contrastive study has been made on the tap-water-eroded sintered NdFeB by SEM and metallographical microscope.

試驗采用SEM、金相顯微鏡等時比研究了NdFeB磁體被自來水腐飲前后的情況欧美性爱自拍小视频。

In the thesis, By using x-ray diffraction, energy spectrum analysis, metallographical analysis and scanning electron microscopy and opitimzing technology, the effects of the element Ga was researched and discussed in the magnetic performance and microstructure of Sintered Nd15Fe78B7+Ga permanent magnets made by powder metallurgy.

本文采用粉末冶金方法黄视频官方网站，通過x射線衍射、能譜分析人妻视频在线精品网站免费、金相分析和電子掃描等一系列的檢測與分析方法www.大色网.com，優(yōu)化工藝，研究并討論了添加Ga元素對燒結(jié)Nd_(15)Fe_(78)B_7系永磁體磁性能和微觀結(jié)構(gòu)的影響,2021国产一级黄色视频。

YBCO films were fabricated on0~15°-miscut SrTiO3 (001) single crystal substrates by pulsed laser ablating apowder sintered targ...

用脈沖激光蒸發(fā)普通固態(tài)燒結(jié)靶在0~15°斜切SrTiO_3 (001)單晶基片上制備了YBCO薄膜视频高清国产在线观看网站下载安装。

In this article, three kinds of prealloy powder were developed by water atomization method. The base attribute, pattern, phase composition, differential thermal analysis of powder were researched. Sintered density, hardness, bend strength, Young's modulus were researched as hot pressed sintering temperature changing. By using abrasive wearing equipment upbuilt by the authors, the wear resistance were determined. Green-pressing density, simulated green-pressing strength and bonding momental of high frequency brazing were assayed. SEM corrosion structure and SEM appearance of fracture were observed.

本文采用水霧化法開發(fā)了三種預(yù)合金代鈷粉末：對粉末的基本屬性、形貌AV三级在线观看网址，粉末的相組成欧美AA视频网站，粉末的差熱性進行了分析研究；測定了它們的燒結(jié)密度欧美性性享受在线、硬度A三级片免费网站、抗彎強度、彈性模量隨熱壓燒結(jié)溫度變化的規(guī)律AAA黄片一级二级三级；采用作者自行建立的磨料磨損試驗方法尹人香蕉免费一级毛片，測定了它們的質(zhì)量磨損百分率；測定了它們的冷壓生坯密度呦精品www在线播放、模擬生坯強度以及高頻釬焊的結(jié)合力矩国产综合久久久久；觀察了熱壓燒結(jié)SEM腐蝕組織和SEM斷口形貌。

The result shows the mechanical property of electrical porcelain sintered in reduce-atmosphere is better than in oxygenic.

采用 X射線衍射欧美乱妇狂野欧美在线视频、掃描電鏡等測試技術(shù)對材料內(nèi)部的晶體結(jié)構(gòu)進行了分析超碰黄色1，討論了不同氣氛下鐵、鈦雜質(zhì)在電瓷材料中的作用機

The porously sintered hydroxyapatite and poly oligomer were used to prepare a series porous poly/hydroxyapatide composites as a biodegradable hard tissue repair material, and its physical-chemical properties were studied in this investigation. The used PLLA oligomer, mentioned above, was prepared via acidic hydrolytic reaction.

本研究利用燒結(jié)的方法制作多孔性的氫氧基磷灰石燒結(jié)體国产老人性交黄片，加入聚乳酸及由高分子量聚乳酸降解的乳酸寡聚物制作成PLLA/HA復(fù)合材色色色色鬼，以作為硬組織生物可吸收性修補材之用。