查询词典 tungstate

A chromium free conversion coating at least equivalent in corrosion protective quality to conventional chromate conversion coatings can be formed on metals, particularly cold rolled steel, by a dry-in-place aqueous acidic liquid comprising: a component of anions, each of said anions consisting of at least four fluorine atoms and at least one atom of an element selected from the group consisting of titanium, zirconium, hafnium, silicon, and boron, and, optionally, ionizable hydrogen atoms, and optionally, one or more oxygen atoms; a component of cations of elements selected from the group consisting of cobalt, magnesium, manganese, zinc, nickel, tin, zirconium, iron, and copper; the ratio of the total number of cations of this component to the total number of anions of component being at least 1:5; sufficient free acid to give the composition a pH in the range from 0.5 to 5.0; a component selected from the group consisting of phosphorus-containing inorganic oxyanions and phosphonate anions; and a component selected from the group consisting of water-soluble and water-dispersible organic polymers and polymer-forming resins and, preferably, also including a component selected from the group consisting of tungstate, molybdate, silicotungstate, and silicomolybdate anions.

通过对包含以下成分的含水酸性液体进行干燥，可以在金属上形成无铬的转换涂层，该涂层与普通铬酸盐转换涂层相比，至少在抗腐蚀质量上等效：$_一种阴离子成分，所述各个阴离子包括至少4个氟原子，至少选自钛、锆、铪、硅与硼元素中的1个原子。任选地可离解的氢原子，任选地1个或多个氧原子；$_一种选自钴、镁、锰、锌、镍、锡、锆、铁与铜元素的阳离子成分，上述成分的阳离子总数与成分内的阴离子总数之比至少为1∶5；$_足够的游离酸以使该组合物的pH值在0.5～5.0的范围内；$_一种选自含磷的无机含氧阴离子与膦酸盐阴离子的成分；$一种选自水溶性与水可分散性有机聚合物与聚合物形成的树脂的成分，优选还包括一种选自钨酸盐、钼酸盐、钨硅酸盐与钼硅酸盐阴离子的成分。

Using cyclohexanol as raw material, in presence of sodium tungstate and phosphotungstic acid as catalyst, the technique for oxidizing cyclohexanol to cyclohexanone with hydrogen peroxide were discussed.

以环己醇为原料、钨酸钠和磷钨酸配合为催化剂，探讨了双氧水为氧化剂氧化环己醇合成环己酮的工艺方法。

The measured ammonium tungstate or yellow tungstenic acid and a latent solvent are dissolved in hot water; then the mesoporous TiO2 nanometer tube carrier is added; the WO3/TiO2 nanometer tube catalyst is prepared by the steps of vaporizing, drying, baking and activating, etc.

将计量的钨酸铵或黄钨酸和助溶剂溶于热水中，然后加入介孔TiO 2 纳米管载体，经蒸发、烘干、焙烧活化等步骤即制得WO 3 /TiO 2 纳米管催化剂。

The reaction results show that the catalytic activity and selectivity of W-HMS prepared with tungstic acid is better than that prepared with sodium tungstate. And the consumption of t-BuOH also is successfully reduced.

实验结果表明：钨酸是制备W-HMS催化剂很好的钨源，以钨酸为原料制备的催化剂具有很高的催化活性和选择性，使溶剂叔丁醇用量大为减少。

Crystal,stimulated Raman scatting,upconversion,thurum,zinc tungstate

晶体，受激拉曼散射，上转换，铥，钨酸锌

CuWO_4·2H_2O/Cu_2WO_4_2 precipitates were first obtained by adding aqua ammonia into a liquor solution containing natrium tungstate and copper chloride, then the solution was heated to remove ammonia.

将该复合粉压坯在H2 气氛中于不同温度下烧结后，对烧结体的微结构和物理、力学性能等进行了测试分析。

Nanosized W-Cu powder containing 20 weight percents of Cu was prepared by a homogeneous coprecipitation process,in which Cu2WO42 / CuWO4·2H2O precipitates were first obtained by adding aqua ammonia into a liquor solution containing natrium tungstate and copper chloride and heating the solution to remove ammonia.

采用蒸氨均相共沉淀法，即加热含有Cu2+和WO42-的氨络合物溶液，使氨蒸发，获得沉淀物，然后对沉淀物进行煅烧、还原，最终制得了含Cu量为20%的W-Cu复合粉。

Preparation of nano Zn-phtalate with different morphologies ;2. And the morphologies of lead tungstate crystal were different when different surfactants of polygycol 200 and cetyltrimethyl ammonium bromide were added in the experiments.

讨论了表面活性剂对钨酸铅低维粉体形貌的影响，认为PEG200对分散性良好的钨酸铅纳米晶的生成起了关键作用，而CTAB则促进了成形良好的菱形钨酸铅微晶的生成。

And the morphologies of lead tungstate crystal were different when different surfactants of polygycol 200 and cetyltrimethyl ammonium bromide were added in the experiments.

以钨酸钠和醋酸铅为原料，分别加以表面活性剂聚乙二醇200和十六烷基三甲苯溴化铵，用沉淀法合成出钨酸铅纳米晶和菱形微晶。

A set of high pressure esterification reaction apparatus has been designed and established. By comparison of ten kinds of esterification catalyst, ammonium molybdate and sodium tungstate were chosen as properly catalyst of this reaction.

自行设计、安装了一套高压酯化反应装置，经比较、筛选十种酯化反应催化剂，确定钼酸铵、钨酸钠为该反应适宜的催化剂。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。