Na_2O在Al（OH）_3颗粒中的赋存状态及煅烧过程的行为

Ｎａ２Ｏ是非冶金级Ａｌ２Ｏ３的重要技术指标。本文应用Ｄ／ＭＡＸ—３ＢＸ射线衍射。ＩＲ－４４０红外光谱、化学物相分析等方法研究了赋存于氧化铝水合物中的Ｎａ２Ｏ在煅烧过程中的行为，β－Ｎａ２Ｏ·Ａｌ２Ｏ３随温度升高而分解，最终是α—Ａｌ２Ｏ３与Ｎａ２Ｏ·１１Ａｌ２Ｏ３共存。氧化铝水合物的Ｎａ２Ｏ含量增加，煅烧产品的α—Ａｌ２Ｏ３含量减少、比表面积降低。研究结果对生产及应用Ａｌ２Ｏ３的行业均有益。     

AlOOH对Al2O3直接凝固注模成型坯体强度等性能影响

为了改善直接注模成型（ＤＣＣ）氧化铝的坯体性能，在Ａｌ２Ｏ３－ＤＣＣ过程中加入ＡｌＯＯＨ本文详细研究了Ａｌ２Ｏ３＋ＡｌＯＯＨ体系的湿坯性能，干燥行为及烧结致密化过程，结果表明，少量ＡｌＯＯＨ加入可显著提高Ａｌ２Ｏ３的湿坯抗压强度和弹性模量，当ＡｌＯＯＨ体积含量〈３．０％时对干燥过程没有影响，干燥坯体经无压烧结后可获得烧结密度达３．９７ｇ／ｃｍ＾３（９９．７％ＴＤ）。显微结构均匀的α－Ａｌ２Ｏ３相。     

用快速胶凝法制备无机氧化铝膜

用溶胶快速胶凝法制备了无龟裂的氧化铝膜． 勃姆石凝胶膜的厚度与喷雾距离、时间和溶胶的浓度之间的关系为δ∝ｃｔ／ ｄ２ ． 适宜的溶胶（ Ａｌ Ｏ Ｏ Ｈ） 浓度为０ ．５ ～１ ．４ｍｏｌ／ Ｌ,粘度应小于２５ ×１０ － ３ Ｐａ·ｓ．用此法可制备厚度为０ ．０５μｍ 的超薄负载氧化铝膜和厚度为０ ．２ｍ ｍ 的无龟裂的无负载氧化铝膜． 利用 Ｘ 射线衍射、透射电镜研究了不同温度时的物相和膜的截面、表面的形貌． γ Ａｌ２ Ｏ３ 膜的晶粒大小均匀, 以长形晶粒为主, 形成了较均匀的孔结构, 微孔孔径约为３ｎｍ     

Fe（OH）3中微量金属离子对水热合成α—Fe2O3粒径的影响

本文研究了某些金属离子（Ａｌ＾３＋、Ｍｎ＾２＋、Ｚｎ＾２＋、Ｃｒ＾２＋、Ｎｉ＾２＋、Ｃｏ＾２＋）Ｆｅ（ＯＨ）３凝胶经水热法合成的α－Ｆｅ２Ｏ３微粉颗粒大小的影响。研究结果出现，随着金属离子的浓度在一定范围内（０．０１０－０．０５０ｍｏｌ·Ｌ＾－１）的增加，α－Ｆｅ２Ｏ３颗粒有减小的趋势。其中加入Ｃｏ＾２＋（０．０５０ｍｏｌ·Ｌ＾－１）、Ｍｎ＾２＋（０．１００ｍｏｌ·Ｌ＾－１）可以得到粒径为７５ｎｍ     

Al2O3-Na2O-CaO-SrO系统富Al2O3区域固态反应的研究

用理学Ｘ射线衍射仪、ＴＧ－ＤＴＡ、ＩＲ－４４０ 红外光谱研究了Ａｌ２Ｏ３－Ｎａ２ Ｏ－ＣａＯ－ＳｒＯ系统富Ａｌ２Ｏ３ 区域固态反应。实验结果表明,煅烧过程固态反应的最终物相组成为Ｎａ２Ｏ·１１Ａｌ２Ｏ３,ＣａＯ·６Ａｌ２Ｏ３ ,ＳｒＯ·６Ａｌ２Ｏ３ 与α－Ａｌ２Ｏ３ 共存     

纤维状氧化铝粉末的制备

将ＡｌＣｌ３水溶液与环氧氯丙烷作用生成Ａｌ（ＯＨ）３凝胶。凝胶经溶剂置换，干燥，灼烧后得氧化铝粉末，为δ相。氧化铝粒子的形状呈纤维状，长约２００ｎｍ，宽约２０ｎｍ，比表面积为６６．０ｍ＾２／ｇ。     

重力分离SHS法制备陶瓷内衬复合钢管耐蚀性的研究

基于重力分离ＳＨＳ法制备了陶瓷内衬复合钢管，分析了内衬陶瓷层的组织结构及添加剂ＳｉＯ２和ＣｒＯ３对复合钢管耐蚀性的影响。研究发现，内衬陶瓷层主要由构成枝晶的α－Ａｌ２Ｏ３基体相和分布于其间的ＦｅＯ·Ａｌ２Ｏ３尖晶石相所组成，ＳｉＯ２主要以石英相结构存在于枝晶晶界中。在Ｆｅ２Ｏ３＋Ａｌ＋ＳｉＯ２体系中，陶瓷层的腐蚀主要为晶间腐蚀，并在ＳｉＯ２添加量为４％ｗｔ时，复合钢管的腐蚀失重率出现极大值（约为１     

Na2O在Al（OH）3颗粒中的赋存状态及煅烧过程的行为

Ｎａ２Ｏ是非冶金级Ａｌ２Ｏ３的重要技术指标，本文应用Ｄ／ＭＡＸ－３ＢＸ射线衍射，ＩＲ－４４０红外光谱，化学物相分析等方法研究了赋存于氧化铝水合物中的Ｎａ２Ｏ在煅烧过程中行为β－Ｎａ２Ｏ．Ａｌ２Ｏ３随温度升高而分解，最终是αＡｌ２Ｏ３与Ｎａ２Ｏ．１１Ａｌ２Ｏ３共存，氧化铝水合物的Ｎａ２Ｏ含量增加，煅烧产品的α－Ａｌ２Ｏ３含量减少，比表面降低，研究结果对生产及应用Ａｌ２Ｏ３的行业均有益。     

氧化铝基陶瓷凝胶注模成型工艺的研究——(I)悬浮体的制备及流变特性

本文研究了单相α－Ａｌ２Ｏ３及ＺｒＯ２（３Ｙ）－Ａｌ２Ｏ３复相陶瓷的凝胶注模成型工艺,着重研究了低粘度高固相体积分数浓悬浮体的制备及其固化。在碱性条件下,用自制的分散剂ＭＮ制备出固相含量高达６５ｖｏｌ％、粘度为２６７ｍＰａ．ｓ的α－Ａｌ２Ｏ３浓悬浮体,以及低粘度下固相含量达５５ｖｏｌ％的１０ｖｏｌ％ＺｒＯ２（３Ｙ）－Ａｌ２Ｏ３复相陶瓷浓悬浮体。并研究了凝胶注模奄型坯体的性能。     

掺杂聚苯胺磁化率的研究

分别研究了浓Ｈ２ＳＯ４掺杂本征态聚苯胺（ＰＡｎ）、ＨＣｌ掺杂ＰＡｎ以及ＦｅＣｌ３掺杂这两种聚安在地的磁化率。通过研究磁化率的变化曲线,我们得到了一些有意义的结果：浓Ｈ２ＳＯ４掺杂ＰＡａ和ＨＣｌ掺杂ＰＡｎ的磁化率变化规律不同;ＦｅＣｌ３掺杂浓Ｈ２ＳＯ４－ＰＡｎ材料可以获得比ＦｅＣｌ３掺杂ＨＣｌ－ＰＡｎ材料更高的磁化率;ＦｅＣｌ３在掺杂ＨＣｌ－ＰＡｎ材料和浓Ｈ２ＳＯ４－ＰＡｎ材料时,ＦｅＣｌ３在这两种     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.     

新闻(英文)

正China and Greece Sign the Standardization Cooperation Agreement Witnessed by Chinese Premier Li Keqiang and Greek Prime Minister Antonis Samaras,AQSIQ Minister Zhi Shuping and ELOT Chairman and Executive Director Angelos Tolkas signed the SAC-ELOT Standardization Cooperation Agreement.The Agreement is one of the critical cooperation documents signed during Li Keqiang’s visit in Greece,encouraging China and Greece to