Through controlling devitrification of core, it is possible to make a high-quality core which is used for the prodttctioa of directionally solidified blade with complex cavities. 合理控制反玻璃化程度,就可制成优质石英基陶芯在空心叶片铸造中应用。
Devitrification of Mold Flux Glassy Film for Medium Carbon Steel Slab fiber glass reinforced thermoplastics 中碳钢板坯保护渣玻璃质渣膜脱玻化玻璃纤维增强热塑性塑料,热塑性玻璃钢
The development process of the devitrification is featured by a gradual increasing trend from crystallite to skeletal crystal ( microlite) and finally to spherulitic. 它们发育过程由雏晶-骸晶(微晶)-球粒逐渐增强。
An oil lamp with a glass chimney and perforated metal lid to protect the flame from high winds; candlestick with a glass chimney. Devitrification of Mold Flux Glassy Film for Medium Carbon Steel Slab 一种有玻璃灯罩和金属穿孔板防止大风吹熄火焰的油灯;有玻璃灯罩的烛台。中碳钢板坯保护渣玻璃质渣膜脱玻化
Solution, devitrification as well as forming and recrystallization of secondary mineral can increase primary porosity as a whole; 溶蚀、脱玻化、次生矿物的生成和重结晶等成岩作用的总效应导致孔隙增加;
Extent of devitrification numerical calculation of high order aberration coefficients of radial GRIN lens 透明消失[程]度,失透[程]度梯度透镜折射率分布高次项系数的数值计算
A study on the devitrification of silica glass tube in the diffusion furnace 扩散炉中石英玻璃管析晶的探讨
Influence of Na_2O Content on Sintering and Devitrification of Glass-ceramic Decorated Material Na2O对微晶玻璃装饰板烧结和析晶的影响
Results are as follows. Vitrification solution PMDD ( 2% PVP) containing many cryoprotectants could vitrify stably and its devitrification rate was also, so it is suitable for embryo vitrification. 结果表明:含有多种抗冻剂的玻璃化液PMDD(2%PVP),玻璃化稳定,脱玻璃化率较低,适宜进行玻璃化冷冻。
A little Al 2O 3 would decrease high temperature viscosity of glaze flux, depress its devitrification and accordingly improve the whiteness and glossiness of glaze surface. 少量Al2O3则可以降低釉熔体高温粘度,抑制析晶,改善釉面白度和光泽度。
The detemperature rate of OPS during thawing process is faster than that during freezing process, which is good for prevent the occurring of devitrification. 某些溶液解冻时的反玻璃化问题更需要重视,拉伸麦管的复温速率高于降温速率,有利于防止反玻璃化产生。
It reflects the devitrification process and stability of amorphous better that the nucleation incubation time during isothermal heating was adopted to calculate activation energy of crystallization through Arrhenius equation. 根据等温转变过程晶体相形核孕育期采用Arrhenius公式所确定的晶化激活能更能反映非晶晶化过程及非晶的稳定性。
When annealed at different temperatures around the devitrification peak, TBA all can crystallize completely and the value of Tg ′ increases from-42.0 ℃ to-34.9 ℃. 在反玻璃化峰附近的温度进行退火可使叔丁醇充分析出,Tg'由-42.0℃上升到-34.9℃。
Al_2O_3 can strongly restrain devitrification; Al2O3强烈抑制失透;
The devitrification of acid volcanic glass 酸性火山玻璃的脱玻化作用
Study and Practice on the Devitrification of Ceramic Products 陶瓷产品失透的研究与实践
Study on Devitrification in YAG: Nd~ ( 3+) Crystals by Cathodoluminescence Micrography 电子显微术研究YAG:Nd~(3+)晶体中的失透
The thermic stability of rare earth doped BaO-Al-2O-3-B-2O-3-SiO-2 glasses is tested, and the phases separation and devitrification course of the M series glass heat-treated at different conditions are investigated by XRD and TEM/ EDS. 借助差热分析测定了稀土掺杂BaO-Al2O3-B2O3-SiO2玻璃的热稳定性。采用XRD和TEM/EDS研究了在不同热处理条件下M玻璃样品的失透、析晶过程的微观结构。
The results showed that in vitrification and devitrification experiments, white ice crystal appeared in solution of 20% PVP+ 7% DMSO and 30% PVP+ 7% DMSO during freezing and thawing; 结果表明:20%PVP+7%DMSO和30%PVP+7%DMSO在冷冻和解冻过程中都出现白色冰晶;
The devitrification will disappear after annealing at-37 ℃ for 20 min. 在-37℃时,退火20min可完全消除反玻璃化。
The devitrification resistant characteristic of high purity silica fibres 高纯二氧化硅纤维的抗析晶特性
Through repeated experimental investigation, a composite nano-crystalline structured thin film was realized on the sapphire substrate, and the devitrification effect at high temperature has been eliminated. 通过反复的实验研究,在蓝宝石基底上研制出了具有复合相纳米晶结构的薄膜,解决了光学膜在高温下由于结晶而产生失透的问题。
And mullite is devitrified from the original material at around 980 ° C. The devitrification will occur progressively with the increase of the heat treatment temperature, causing the mullite grains to grow and crystallinities increase, which reduces the flexibility of the fibers. 在980°C时析出莫来石晶体。随着热处理温度的升高,析晶过程逐步进行致使晶粒长大、结晶度增加,纤维表面变得粗糙不平,弹性降低。
During heating and ( or) cooling processes, the cryoprotectant aqueous solutions show many thermal events such as crystallization, melting, glass transition, devitrification ( cold crystallization) and enthalpy relaxation. 在降温和复温过程中,低温保护剂水溶液会经历一系列的吸热和放热现象,比如结晶、熔融、玻璃化转变、反玻璃化、焓松弛等。
This phenomenon can be explained by the fact that after heat treatment, the devitrification and the increased grain size and crystallinities of the sample after heat treatment increase the mean free path of phonon scattering, thus the solid conduction by fibers increase. 高温热处理使材料发生析晶,结晶度的增加、晶粒尺寸的增大加大了声子散射的平均自由程,因此增加了固体热导率。