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先驱体
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  precursor
     A Pb(Mg1/3Nb2/3)a(Mn1/3Nb2/3)b(Mn1/3Sb2/3)cZrdTieO3(PMMSN) polynary system medium-temperature piezoelectric ceramics was prepared by composite columbite precursor methods.
     采用复合先驱体法制备了Pb(Mg1/3Nb2/3)a(Mn1/3Nb2/3)b(Mn1/3Sb2/3)cZrdTieO3(PMMSN) 铅镁锰锑铌多元系中温烧结压电陶瓷材料。
短句来源
     SYNTHESIS OF TERNARY Pb(Sc 1/2 Ta 1/2 )O 3-PbZrO 3-PbTiO 3 PEROVSKITE POWDER BY PRECURSOR METHOD
     先驱体法合成三元系Pb(Sc_(1/2)Ta_(1/2))O_3-PbZrO_3-PbTiO_3钙钛矿铁电陶瓷粉末
短句来源
     With the increase of pyrolysis temperature,C3N6H6 and H3BO3 unit in the precursor is gradually decomposed,accompanied by the release of H2O,NH3,CO2,and NO2 gases.
     随热解温度的升高,先驱体中的H3BO3和C3N6H6结构单元逐渐发生分解,同时依次放出H2O,NH3,CO2,NO2等气体.
短句来源
     The results indicate that the precursor C3N6H6(H3BO3)2 is a 3D supramolecular compound which is constructed by different hydrogen-bonding interactions between C3N6H6 and H3BO3 molecules.
     结果表明,先驱体C3N6H6(H3BO3)2是由C3N6H6分子和H3BO3分子通过分子间氢键作用形成的三维超分子结构化合物.
短句来源
     Pb1-xSrx(Mn1/3Sb2/3)aZrbTicO3 piezoelectric ceramics were prepared by precursor method.
     采用先驱体法制备了Pb1-xSrx(Mn1/3Sb2/3)aZrbTicO3压电陶瓷。
短句来源
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  precursor pyrolysis
     Effect of Pyrolysis Temperature on Structure and Properties of 2D-C_f/SiC Composites Fabricated by Precursor Pyrolysis
     裂解温度对先驱体转化制备2D-C_f/SiC材料结构与性能的影响
短句来源
     C_f/SiC Composites Prepared by Precursor Pyrolysis and Hot Pressing
     先驱体转化─热压烧结法制备C_f/SiC复合材料
短句来源
     Tensile Creep of UD-C_f/SiC Composites Prepared by Precursor Pyrolysis and Hot Pressing at Elevated Temperature
     先驱体转化-热压单向C_f/SiC复合材料的高温拉伸蠕变
短句来源
     Application of Boron in Fabricating of 2D C_f/SiC Composites by Precursor Pyrolysis
     硼在先驱体转化制备2DC_f/SiC材料中的应用
短句来源
     BENDING BEHAVIOR OF UD-C_f/SiC COMPOSITES PREPARED BY PRECURSOR PYROLYSIS AND HOT PRESSING AT ELEVATED TEMPERATURES
     先驱体转化-热压单向C_f/SiC复合材料的高温弯曲力学行为
短句来源
更多       
  columbite precursor
     A Pb(Mg1/3Nb2/3)a(Mn1/3Nb2/3)b(Mn1/3Sb2/3)cZrdTieO3(PMMSN) polynary system medium-temperature piezoelectric ceramics was prepared by composite columbite precursor methods.
     采用复合先驱体法制备了Pb(Mg1/3Nb2/3)a(Mn1/3Nb2/3)b(Mn1/3Sb2/3)cZrdTieO3(PMMSN) 铅镁锰锑铌多元系中温烧结压电陶瓷材料。
短句来源
     PREPARATION AND CHARACTERIZATION OF PMN-PT RELAXATION FERROELECTRIC POWDER BY COLUMBITE PRECURSOR METHOD
     先驱体合成法制备PMN-PT弛豫铁电体及其表征
短句来源
     Preparation and Characterization of PMN-PT Relax Ferroelectric Powder by Columbite Precursor Method
     弛豫铁电体PMN-PT:先驱体法制备及表征
     (1-x)PMN-xPT relaxation ferroelectric fine powders were prepared by a columbite precursor method with simple oxides as starting materials. The effects of calcining temperature and solid solution amount of PbTiO3 on the phase formation and structure were investigated.
     采用先驱体合成法,以氧化物为原料制备了钙钛矿结构的(1-x)PMN-xPT弛豫铁电陶瓷粉末,研究了预烧温度以及PbTiO3固溶量等工艺参数对样品的相结构的影响.
短句来源
     The measurement indicates that the optimized performance can be achieved by three-element composite columbite precursor methods.
     性能测试结果表明,三组元复合先驱体法制成样品的性能最佳。
短句来源
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  “先驱体”译为未确定词的双语例句
     Piezoelectric Ceramics of Pb_(1-x)Sr_x(Mn_(1/3)Sb_(2/3))_aZr_bTicO_3:Preparation and Properties
     先驱体法制备Pb_(1-x)Sr_x(Mn_(1/3)Sb_(2/3))_aZr_bTicO_3压电陶瓷的压电和介电性能
短句来源
     Pb(Mg_(1/3)Nb_(2/3))_A (Mn_(1/3)Nb_(2/3))_B(Mn_(1/3)Sb_(2/3))_CZr_DTi_EO_3 (PMMSN) polynary system medium-temperature
     采用先驱体法制备了Pb(Mg_(1/3)Nb_(2/3))_A(Mn_(1/3)Nb_2/3))_B(Mm_(1/3)Sb_(2/3))_CZr_DTi_EO_3(PMMSN)铅镁锰锑铌多元系中温压电陶瓷材料。
短句来源
     A foam ceramics of Al2TiO5–TiO2–SiO2 doped with CeO2 and Er2O3 was prepared by organic foam soaking.
     用有机先驱体浸渍法制备了CeO2和Er2O3等稀土掺杂的Al2TiO5–TiO2–SiO2多相泡沫陶瓷。
短句来源
     Study of 3D C_f/Si-Ti-C-O Composites Prepared From Polytitanocarbosilane
     聚钛碳硅烷先驱体转化法制备3D C_f/Si-Ti-C-O复合材料研究
短句来源
     Study of 2D C_f/Si-O-C Fabricated via Polysiloxane Pyrolysis
     聚硅氧烷先驱体转化制备2D C_f/Si-O-C材料
短句来源
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  precursor
The overall process involves three steps: preparation of insoluble carboxyl-containing grafted starch copolymer (ISC), formation of precursor (ISC-Co), decomposition of ISC-Co, and phase transition of Co3O4 nanoparticles.
      
The precursor was proved to be [Zn5(OH)6(CO3)2] by TG-DTG-DTA and IR analysis.
      
This precursor was calcined at 300°C for 1, 2 and 3 hours respectively, and then the nanocrystalline ZnO of different grain size were obtained.
      
Steam produced during the decomposition process accelerated the sintering of MgO, and MgO with surface area as high as 412 m2 · g-1 was obtained through calcining its precursor in flowing dry nitrogen at 520°C for 4 h.
      
ZrWMoO8 powders with different morphologies were obtained using ammonium tungstate, molybdate tungstate and zirconium tungstate as the starting materials by dehydrating the precursor ZrWMoO7(OH)2(H2O)2.
      
更多          
  precursor pyrolysis
With a 10 °C/min heating rate, the weight loss due to precursor pyrolysis occurs predominantly at temperatures below 500 °C.
      
Three-dimensional braided preform reinforced Si--C--N composites prepared by precursor pyrolysis
      
The processing and reaction mechanism of metallic aluminum (Al) powder as an active filler that controls polycarbosilane (PCS) precursor pyrolysis are investigated.
      
  columbite precursor
The columbite precursor phase was structurally characterized using diffraction data.
      
Polycrystalline samples of Pb(Mg1/4Zn1/4Nb1/2)O11/4 have been synthesized by high temperature columbite precursor solid state reaction technique.
      
The charge deficiency of the compound presumably gets compensated in the high temperature columbite precursor process of sample preparation which is supported by single phasic form of the material.
      
A series of Pb(Mg1/3Nb2/3)O3-Pb(Ni1/3Nb2/3)-O3-PbTiO3 (PMN-PNN-PT) ceramics with compositions of (1-x)(0.67PMN-0.33PT)-x(0.64PNN-0.36PT) (x = 0.1-0.9) were synthesized using the columbite precursor method.
      
All the compositions were synthesized using columbite precursor method and sintered using inverted crucible approach.
      
更多          


The effect of pH for coprecipitation of ZrO_2 gel on the crystal phase in the calcined zirconia powder was determined. Fraction of tetragonal ZrO_2 in the powder doped by Y_2O_3 or MgO increases with the increasing of pH value.Monoclinic zirconia is produced from materials precipitated in the near neutral condition, almost pure tetragonal zirconia is obtained in the pH range of 13—14. The structural evolution of ZrO_3 gel during crystallizing process was investigated using XRD, Raman spectrum and electron diffraction...

The effect of pH for coprecipitation of ZrO_2 gel on the crystal phase in the calcined zirconia powder was determined. Fraction of tetragonal ZrO_2 in the powder doped by Y_2O_3 or MgO increases with the increasing of pH value.Monoclinic zirconia is produced from materials precipitated in the near neutral condition, almost pure tetragonal zirconia is obtained in the pH range of 13—14. The structural evolution of ZrO_3 gel during crystallizing process was investigated using XRD, Raman spectrum and electron diffraction technique. It is realized that phase composition of calcined ZrO_2 is controlled by precursor gel structure. The pH of the solution affects the structure of hydrated ZrO_2 gel precipitated from it, and then affects the structure of dehydrated ZrO_2 gel and calcined ZrO_2. Dehydrated ZrO_2 gel precipitated in the near neutral condition and pH value in the range of 13—14 have the monoclinic-like and tetragonal-like structure respectively.

研究了共沉淀过程pH值对凝胶热分解后Y_2O_3、MgO部分稳定ZrO_2相组成的影响。采用XRD、Raman光谱,以及高分辨电镜分析了凝胶析晶过程结构的演变规律。认为氧化锆的相组成受凝胶先驱体结构的控制,沉淀过程pH值影响水合氧化锆凝胶的结构,进而影响凝胶热分解后ZrO_2的相组成。近中性和高碱性条件下沉淀的凝胶分别具有类单斜和类四方氧化锆结构。

The Al_2O_3 coating of of 5—30nm thickness, measured by TEM and EDAX, on the surface of SiC whisker was successfully prepared by sol-gel processing using Al(OC_3H_7)_3 as a precursor. The influences of sol concentration, surface pretreating techniques and coating times on QV(volume of coating per unit volume of whisker)are investigated. It is suggested that covalent bond between SiC and Al_2O_3 on the interface and formation of colloidal group in SiC-Al(OC_2H_7)_2(OH)-CH_2OH-H_2O system are the important mechanism...

The Al_2O_3 coating of of 5—30nm thickness, measured by TEM and EDAX, on the surface of SiC whisker was successfully prepared by sol-gel processing using Al(OC_3H_7)_3 as a precursor. The influences of sol concentration, surface pretreating techniques and coating times on QV(volume of coating per unit volume of whisker)are investigated. It is suggested that covalent bond between SiC and Al_2O_3 on the interface and formation of colloidal group in SiC-Al(OC_2H_7)_2(OH)-CH_2OH-H_2O system are the important mechanism of coating.

用异丙醇铝为先驱体通过溶胶-凝胶工艺成功地在SiC晶须表面涂覆了5—30nm的Al_2O_2涂层。认为SiC表面与Al(OC_2H_7)_2(OH)形成配位键并构成胶团是形成涂层的重要机制。研究了溶胶浓度、晶须预处理,晶须直径和反复涂层对涂层效果的影响。

Polytitanocarbosilane(PTC),the precursors of SiC fibers containing Ti,was synthesized by the reaction between polycarbosilane(PC)and tetrabu-toxititanium(Ti(OBu)_4).The structure and properties of PTC dependdirectly on the molar ratio of Ti(OBu)_4/PC.The spinnability and themelting point of PTC change regularly with this ratio.It is attributed tothe formation of the crosslinked structure by —Ti—O— as bridge groupand the pendant structure by—Ti(OBu)_3 as side group.The relationbetween structure and properties...

Polytitanocarbosilane(PTC),the precursors of SiC fibers containing Ti,was synthesized by the reaction between polycarbosilane(PC)and tetrabu-toxititanium(Ti(OBu)_4).The structure and properties of PTC dependdirectly on the molar ratio of Ti(OBu)_4/PC.The spinnability and themelting point of PTC change regularly with this ratio.It is attributed tothe formation of the crosslinked structure by —Ti—O— as bridge groupand the pendant structure by—Ti(OBu)_3 as side group.The relationbetween structure and properties of PTC has been studied in this paper.SiC fiber containing Ti has been obtained from PTC-0.02 and PTC-0.04with good spinnability as their precursors.

通过聚碳硅烷与四丁氧基钛的反应。可以制得含钛碳化硅纤维的先驱体聚钛碳硅烷。反应物配比(Ti(OBu)_4)/PC 将直接影响产物的结构与性能。随这一比例的增加,聚钛碳硅烷的可纺性与熔点将有规律地变化。这可归因于以—Ti—O—为桥的交联结构和以—Ti(OBu)_3为侧基的悬挂结构的形成。本文研究了聚钛碳硅烷的结构与性能的关系,并以具有良好成丝性的PTC-0.02与PTC-0.04为先驱体,制得了含钛碳化硅纤维。

 
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