查询词典 alumina

In the one half part, according to the strontium nature, thermodynamic calculation of correlative reaction and the principle of the vacuum aluminothermy reduction process, with the laboratory findings of preparation strontium by vacuum aluminothermy reduction compared and analyzed in different parameter conditions, a variety of factors which effect the decomposition rate of SrCO_3 and the percent reduction of strontia are gotten out. The factors include that the decomposition rate of SrCO_3 is influenced by different addition and pressure. They also include that the percent reduction of strontia is influenced by excess coefficient of reducing agent aluminium powder, the particle size of raw material or reducing agent, the pressure of barbecuing, temperature and reduction time. According to those, we can draw the conclusion as follows:(1) Decomposition temperature of SrCO_3 is decreased by adding carbon and alumina in different degree.(2) With quantitative carbon added under the vacuum condition, the decomposition temperature of SrCO_3 is decreased obviously, which can fall 150℃ compared with atmospheric pressure.(3) In keeping 1150℃ of 2.5h, under the 5Pa vacuum condition, the decomposition rate of SrCO_3 nearly keeps in 99% steadily.

在前半部分的真空铝热还原法中，根据锶的性质、相关反应的热力学计算及真空铝热还原法原理，通过对不同参数条件下的真空铝热还原法生产金属锶的实验结果的分析比较，得出了影响SrCO_3的分解率和氧化锶的还原率的种种因素，具体因素包括不同添加剂、不同气压对SrCO_3分解率的影响，还原剂铝粉的过量系数、原料与还原剂的粒度、制团压力、温度和还原时间等对氧化锶还原率的影响，得出具体结论如下：(1)添加碳和Al_2O_3能不同程度的降低SrCO_3的分解温度；(2)真空条件下加入一定量的碳可显著降低SrCO_3的分解温度，比之常压下可降低150℃之多；(3)在1150℃恒温2.5h、真空度达到5Pa的条件下，SrCO_3的分解率几乎保持稳定在99％；(4)氧化锶的还原率随还原剂过量系数的增大而增大，但是趋势越来越小，当过量系数超过25％后，氧化锶的还原率几乎不再增加；(5)氧化锶的还原率随原料与还原剂的粒度的变细而增加；(6)氧化锶的还原率随制团压力的增加而增加，但超过一定值后，氧化锶的还原率反而会下降；(7)氧化锶的还原率随还原温度的升高而增加；(8)氧化锶的还原率随还原时间延长而增加，在本实验条件下，超过2.5h趋于稳定。

The cordierite glass-ceramics were prepared using high alumina fly ash as the main raw material.

以高铝粉煤灰为主要原料，制备了堇青石微晶玻璃。

The Company is a professional production of various kinds of electrical ceramics, electronic ceramics, textile ceramics, ceramic machinery, instrumentation, ceramics, alumina ceramics, cordierite ceramic products such as key enterprises.

本公司是专业生产各类电器陶瓷、电子陶瓷、纺织陶瓷、机械陶瓷、仪表陶瓷、氧化铝陶瓷、堇青石陶瓷等产品的重点企业。

The correlation curve between apparent resistance of aluminium cell and alumina concentration is developed through industrial test and research.

通过工业试验研究，摸索出了铝电解槽表观电阻与氧化铝浓度之间的关系曲线。

These include composite structures for the aerospace industry, belting for corrugator and tannery applications, filtration products for alumina and power generation requirements, high-performance industry doors, specialty fabrics for nonwovens and fiber cement manufacturers, and PrimaLoft?

这包括用于航空和航天工业的混合结构，用于制革产业的工业工程皮带，用于矾土以及发电需求的过滤材料，高性能工业卷帘门，专用于无纺产业的织物，已经申请专利PrimaLoft？

These include composite structures for the aerospace industry, belting for corrugator and tannery applications, filtration products for alumina and power generation requirements, high-performance industry doors, specialty fabrics for nonwovens and fiber cement manufacturers, and PrimaLoft patented "synthetic down" insulation for the technical outerwear and home furnishings markets.

这包括用于航空和航天工业的混合结构，用于制革产业的工业工程皮带，用于矾土以及发电需求的过滤材料，高性能工业卷帘门，专用于无纺产业的织物，已经申请专利PrimaLoft 的人造羽绒。

The phase composition was composed of silicon carbide, alumina, mullite and cristobalite.

用于浸渍成型的浆料流变行为可以用Casson模型来描述。

The furnace shell welded by steel plate and steel,the lini-ng used ultra-light energy from refractory brick masonry, between the shell and lining expansion using silicate fibe-rs and heating insulation powder insulation,high temperat-ure alloy components resistance wire 0Cr25Al5 winding spi-ral formgalvanized-installed in the furnace built around the high alumina brick wire,crucible from Q235 low carbon steel plate from double-sided post-welding,thermocouple inserted from the side hearth furnace,contact crucible,squa-re crucible heat galvanizing EAF matching with automatic t-emperature controlcabinet,at room temperature -500℃ adju-stable within arbitrary and automatic thermostat.

炉壳由钢板和型钢焊接而成，炉衬采用超轻质节能耐火砖砌筑而成，外壳与炉衬之间采用硅酸铝纤维和膨胀保温粉保温加热，元件采用高温合金电阻丝 0Cr25Al5绕制而成螺旋状安装在镀锌炉膛周围的高铝搁丝砖上，坩锅由Q235低碳钢板双面剖焊而成，热电偶从炉体侧面插入炉膛，接触坩锅，方坩锅热镀锌炉配套有自动温度控制柜，在室温-500℃范围内任意可调，并自动恒温。

On a cold February day in 1886, he filled the crucible with a cryolite bath containing alumina and passed an electric current through it.

大学毕业后，霍尔在自己简陋的实验室里学会了如何制氧化铝。

The results show that the crystallinity of NCPE decreases with increase of the number of alumina nanoparticles.

结果显示，随着氧化铝纳米粒子含量的增加， NCPE的结晶度降低，离子导电率升高。

Listen,point and check your answers.

听，指出并且检查你的答案。

Warming needle is one of effective treatment methods for knee arthralgia aggravated by cold,and it is simple,safety,so it should be developed in clinical acupuncture and moxibustion extensively.

但以本院科针灸门诊在2005年1月—2006年6月期间共收治膝痛患者100余例，经过临床的诊断后，其中施以温针治疗的48例，疗效显著，报道如下。1临床资料本组病例48