热处理对于鸡蛋全蛋液功能性质的影响

研究了不同强度的热处理条件（处理温度61、64、67℃,处理时间2.5、3.5、4.5min）对于鸡蛋全蛋液蛋白质的溶解性、乳化性、起泡性、表面疏水性和表面巯基含量的影响。结果表明：随着加热温度的升高和处理时间的延长,全蛋液蛋白质溶解度与泡沫稳定性不同程度的下降,而表面疏水性、表面游离巯基含量、乳化稳定性则不同程度的提高。当温度高于61℃时,全蛋液起泡性随温度升高和时间的延长而降低,同时,研究还发现热处理对于全蛋液乳化活力的影响不明显。     

掺Zn改善SnS2光电薄膜的性能

热蒸发制备Zn掺杂SnS2薄膜,研究不同Zn含量及热处理条件对薄膜的物相结构、表面形貌和光电性能的影响。实验给出用Sn∶S=1∶1.08(wt)混合粉末沉积的薄膜,经380℃、15min热处理后得到简单正交晶系的SnS2薄膜;9(wt%)掺Zn后的薄膜热处理条件为370℃、20min。Sn、S和Zn分别以正4价、负2价和正2价存在于薄膜中。SnS2薄膜的直接光学带隙为2.12eV,掺Zn后为2.07eV;薄膜的电阻率从未掺Zn时的4.97×102Ω.cm降低到2.0Ω.cm,下降了两个数量级,所有SnS2薄膜导电类型均为N型。     

单分散镍碳复合纳米球和碳微球的制备

以脱油沥青(deoiled asphalt)为碳源,采用化学气相沉积法(CVD)制备碳微球,其裂解后的残渣经真空热处理制得单分散镍碳复合纳米球.用场发射扫描电镜(FESEM)、高分辨透射电镜(HRTEM)和X射线衍射仪(XRD)对产物进行表征.结果表明,碳微球高纯,属无定型碳结构,大小分布在1～2μm范围内;镍碳复合纳米球为准球形核壳结构,核为镍,壳为碳,尺寸在10～30nm范围,晶化程度较高,结构较完善.     

真空热处理制备Cr2O3-石墨插层化合物工艺参数研究

以三氧化铬(CrO3)与石墨为原料,利用真空热处理方法制备了三氧化二铬(Cr2O3)-石墨的插层化合物(GICs).运用X射线衍射(XRD)分析石墨插层化合物.结果表明:经热处理后,在1400℃时CrO3与石墨(石墨∶CrO3=1∶1)与形成了纯5阶的石墨的插层化合物.XRD分析表明,对网状层面结构的天然石墨,可以利用真空热处理的方法使一些非碳反应物(Cr2O3)插入石墨层间,从而改变石墨的层面结构.X射线光电子能谱(XPS)分析和表征了Cr离子以3价的形式存在于石墨插层化合物中.     

热处理对相变材料纳米胶囊性能的影响

以环己烷和正十八烷为囊心,用原位聚合法合成了三聚氰胺-甲醛树脂为囊壁的相变材料纳米胶囊,在不同温度下对胶囊热处理不同的时间,采用SEM,DSC,TG-DTA和IR等测试手段对胶囊的性能进行了研究.结果表明,热处理对胶囊的表观形貌、相变性能和耐热性能有很大的影响,热处理过程中环己烷扩散出囊壁,在胶囊内形成预留膨胀空间,使胶囊的耐热温度增高.当热处理温度为160～180℃,热处理时间在30～60min时,得到的胶囊破裂较少,胶囊的相变热为150J/g,耐热温度可以达到215℃左右.     

Analysis of strengthening mechanisms through cyclic heat treatment of tungsten heavy alloys

A cell model is presented and numerical analyses are implemented to find the distribution of thermally induced stress, thermally induced deformation and the effect of the tungsten volume fraction during a single step of the quenching process for a 2-dimensional cell model and to find the strengthening mechanisms through the cyclic heat treatment of tungsten alloys. The thermal stresses induced from a single step of quenching mostly concentrated on the W/matrix interface and WAV grain boundary region and the stresses were distributed locally in tensile and locally in the compressible state both in matrix and particle. The mechanism of matrix phase formation at tungsten-tungsten boundaries during cyclic heat-treatment was found to be due to the combination effect of the super saturated matrix phase precipitation into WAV grain boundaries and the thermal stresses state. These results enhance the impact energy enhancement in tungsten heavy alloys.     

对全密度聚乙烯反应器现场组装的质量控制

在对全密度反应器现场施工中难点和关键点,如锥体和筒体组装成形尺寸、接管定位、防止焊接变形、防止焊接裂纹等工序分析的基础上,提出相应的质量控制措施和对策。成功地完成全密度反应器的现场制作,这为我国大型压力容器或同类型的全密度大型反应器的现场组焊提供借鉴。     

Spectral characterization of Yb-doped silica layers for high power laser applications

Thick silica layers, doped with rare-earth elements are required as active media for high power waveguide lasers and amplifiers. In this work, Yb/Al-codoped silica particles were deposited on pure silica wafers, followed by high temperature sintering and post-sinter laser annealing treatment. The optical properties of the layers were monitored at different stages of the process using transmission spectrometry in the near IR to UV range, micro-Raman spectroscopy, fluorescence spectrum, and decay measurements. Evolution of the Yb³⁺ ion fluorescence and stabilization of the Si:O bonds as a result of the sintering process were observed.Measurements of 30 μm thick layers showed high Yb absorption of 500 dB/m at 980 nm. The fluorescence lifetime was close to 1 ms and the propagation loss was less than 20 dB/m at 633 nm, currently limited by the measurement system. The results show that a potential material for high power applications has been achieved.     

高速冲模材料选用与实践

通过对钢结硬质合金GW1和GT35的化学成分、物理性能、可加工性的分析,最终选择牌号为GW1的钢结硬质合金作为硅钢片高速冲模的材料;通过对GW1的热处理过程的研究,确定了其锻造前退火方法、温度,合理选择锻造温度范围,保证锻造质量,在锻造后进行去应力退火,以提高切削加工性能;淬火温度选择在1 020℃,淬火后进行回火处理,防止锻件变形开裂,减小脆性,消除淬火后产生的应力,稳定内部组织,可以作为电机行业高速冲模材料选择的参考.     

热处理油的使用要点

本文讨论了热处理油的基础油及添加剂,简述它们的主要技术参数及影响因素,最后提出了淬火油的使用要点。