大型交叉滚柱轴承的一种早期失效

我局一台10/30t 高架门式起重机,采用3—930型交叉滚柱轴承作为回转支承。新机安装投产后七个月整机拆卸时,发现外圈上滚道内段有几处严重的表层压碎剥落损坏,其情况见图1。剥伤区的宽度约500mm,明显的剥伤区共有三段,每一区段长度不等,约500～1000mm,每段内剥伤是连续的,基本上连成一片,最大剥伤深度约在1mm 以内。在剥伤了区附近还伴有网状磨损刻纹,润滑脂已经变黑,并夹杂了大量剥     

醴陵釉下五彩研究现状分析——基于CNKI(2000—2022)数据统计与分析

醴陵釉下五彩是中华非物质文化遗产的重要组成部分。深入分析釉下五彩研究现状,对釉下五彩知识进行挖掘与共享利用,为釉下五彩的系统性保护、传承、振兴等提供参考和借鉴。以中国知网（CNKI）期刊文献数据库中2000—2022年有关醴陵釉下五彩瓷的文献为研究对象,分别从研究现状、研究进度、研究热点等方面进行分析,对20余年来釉下五彩瓷领域的研究进行动态梳理。研究发现,有关釉下五彩的研究具有明显的增长势头,尤其是以湖南地区为主,其研究主题主要在釉下五彩的历史溯源、烧制方法、造型艺术及其传承与保护上。釉下五彩研究现状表明,釉下五彩的发展关键点在于器具本身的创新。在研究中还发现,各研究机构间的合作频次较少,各研究机构与学者之间关联研究有待进一步加强。     

TXG型剥膜剂的研制

探讨了ＴＸＧ型剥膜剂中各成分的合适含量及作用机理，并对其有关性能进行了实验。结果表明，该剥膜剂具有不燃、低腐蚀、剥膜速度快、效率高和使用寿命长等特点。     

可剥涂料

可剥涂料具有极好的临时防水、化学品及风蚀的保护作用。有些在加工工艺中能很好地承受弯曲及深度成形。在保护应用上,可剥涂料优于保护带,因它可紧贴于任何形状的表面,而不会使涂层产生空隙及皱折现象。可剥涂料的涂敷及去除都很容易,有些可采用先划破薄膜,然后整片揭去,有些     

城市配电网络过电压与接地保护方式的探讨

深入剖析城市配电网络系统过电压的分类、接地保护方式以及接地保护中降低电阻的措施等,尽可能对过电压做到早预防、早保护,避免对线路、电气设备等造成损坏,期望对于配电网络过电压保护具有一定的参考价值。     

低钛涂釉背板玻璃的制备

涂釉背板玻璃是光伏组件最重要的封装材料之一,其反射率对光伏组件的发电效率具有重要影响。光伏涂釉背板玻璃的反射涂层是由钛白粉、玻璃粉、调墨油等配制的釉料,经高温钢化处理烧制而成。由于钛白粉的储量有限且价格昂贵,发展低钛涂釉背板玻璃是降低光伏组件成本的重要途径之一。据此,本研究用低成本的亚钛粉代替钛白粉烧制低钛涂釉背板玻璃,研究了亚钛粉替代率与背板玻璃反射率之间的关系,考察了低钛涂釉背板玻璃的耐酸、耐碱、耐盐浸、耐水煮性能,发现低钛涂釉背板玻璃具有与原涂釉背板玻璃一样的优异耐候性。     

景德镇玲珑釉的测试与分析

采用X射线荧光光谱分析(XRF)、X射线衍射分析(XRD)、差热-失重分析(DTA/TG)、场发射扫描电子显微镜(FESEM)等测试技术对景德镇市售3种玲珑釉进行研究,并做釉的润湿性实验和理论熔融温度计算。实验结果表明景德镇玲珑釉配方工艺技术发展趋势是:在景德镇的传统玲珑釉配方(釉果+釉灰)的基础上,先引入方解石、滑石类的矿物取代釉灰对釉进行改良;然后减少碳酸钙类矿物原料的加入,取而代之的是硅灰石或白云石等,以减少玲珑釉特有的鱼眼、凹眼等缺陷;或是采用高温透明釉,对釉的特有碧绿呈色效果有一定影响。另外,对景德镇市售玲珑釉的性能进行评价,分析其配方的工艺技术发展趋势。     

吉州窑天目釉茶盏的装饰艺术及文化意蕴探析

吉州窑是江南地区一座名闻遐迩的综合性民窑,产品具有浓厚的地方特色和民族艺术色彩.剪纸贴花、木叶纹、窑变釉等装饰具有独特性.天目釉茶盏最具时代艺术的温厚与含蓄,是实用与艺术的完美结合,是附丽与美丽的高度统一.剪纸贴花、木叶纹及各色窑变釉等装饰体现了"初发芙蓉,自然可爱"之美和含蓄、内向的文化意蕴.     

氯丁橡胶剥漆在局部电镀中的应用

１ 前 言 我所在电镀生产中采用涂料绝缘保护法进行局部绝缘。局部绝缘所用涂料又称屏蔽涂料、保护涂料或可剥性涂料。可剥性涂料在局部电镀工艺过程中尽管起暂时保护作用，但是对局部电镀工艺过程的完成是至关重要的。因此，世界各国对可剥性涂料及其配套产品的研究工作给予了极大的关注　。目前，国内使用的可剥性涂料主要有：用于铝合金的氯丁橡胶可剥漆和Ｊ６４－３２黑色丁苯橡胶可剥漆、用于钛合金与不锈钢的丁基橡胶可剥漆和双组分氯磺化聚乙烯可剥漆、Ｇ６４－１过氯乙烯可剥漆、低毒性的水分散型乳胶化铣保护涂料和光敏型化铣保护…     

包装辞典

包装辞典包装ｐａｃｋａｇｉｎｇ；ｐａｃｋａｇｅ；ｐａｃｋｉｎｇ为了在流通过程中保护产品免受损坏，按一定技术方法采用的容器、材料等的总称、应具有保护产品免遭物理和化学损坏的保护功能井应便于装卸、贮存、运输和使用。按结构分为内包装、外包装；按形态分为硬包...     

琉璃瓦颜色测量方法研究

选择常用的两类分光光度计,以色差为评价指标,探索分光光度计在不同测量参数下,对琉璃瓦颜色测量的规律。研究结果表明:在SCI和SCE两种测量模式下,固定测量孔径重复测量结果稳定性好,但不同测量孔径对测量结果具有显著影响;在CIE推荐测量条件下不同测量孔径时,SCI与45°/0°的色差稳定性优于SCE与45°/0°的色差,但SCI与45°/0°的色差显著大于SCE与45°/0°的色差,且SCE在10 mm测量孔径下与45°/0°的色差最接近;琉璃瓦曲率越大,不同测量模式结果的稳定性越差,采用较大孔径(10 mm)测量结果差异最为明显;与SCI和45°/0°相比,SCE对于琉璃瓦表面形态的变化更加敏感。总体而言,积分球式分光光度计的SCE测量模式更适合于琉璃瓦颜色的测量,测量时应选择较大尺寸的测量孔径。     

Radioactivity measurement of primordial radionuclides in and dose evaluation from marble and glazed tiles used as covering building materials in Turkey

Measurements of the natural radioactivity arising from primordial radionuclides ((226)Ra, (232)Th and (40)K) in marble and glazed tile samples used covering building materials in Turkey were carried out by gamma-ray spectrometer with a high purity germanium detector. The mean activity concentrations of the (226)Ra, (232)Th and (40)K in marble and glazed tile samples were found as 8.2, 5.5 and 58.1 Bq kg(-1) and 81.2, 65.4 and 450.1 Bq kg(-1), respectively. The radiation doses received by occupants of buildings in which the sample marble and glazed tiles might be used are estimated using measured activity concentrations of constituent primordial radionuclides and dose conversion factors evaluated by the European Commission from models of tile use. Results obtained are presented for each radionuclide, analysed and compared with relevant national and international legislation, guidance and report, and with the results obtained from other studies. Results show that the use of such decorative building materials in the construction of domestic homes or workplaces in Turkey is unlikely to lead to any significant radiation exposure to the occupants.     

全自动瓷砖包装机翻砖机理研究

研究瓷砖包装机翻砖装置的翻砖机理,探讨了瓷砖在翻转过程中速度、加速度的变化规律以及冲击力对瓷砖品质的影响,分析了瓷砖传送带在工作中拉力频繁变化对工作稳定性的影响,改进了瓷砖翻砖装置,使其更适合翻砖工况要求。     

Nanostructured coatings by liquid flame spraying

Modifying surface properties has become a market of great potential. Self-cleaning, which customarily relies partly on hydrophilicity or hydrophobicity of the surface, has instigated investigation into many different means of modifying surfaces. This study investigates the feasibility of manufacturing a hydrophilic surface on glazed ceramic tile by means of liquid flame spraying. The tiles used were commercial domestic tiles. The hydrophilic surface was produced by synthesising nano-sized titanium dioxide (TiO₂) particles from liquid precursors and depositing them on the surface of heated tiles. The treated tiles were subjected to ultra-violet radiation and their hydrophilic properties were evaluated by contact angle measurements. The surfaces of the tiles were investigated by scanning electron microscopy. The TiO₂ particles were analysed by energy-dispersive spectrometry. The contact angle of water decreased significantly as a result of the treatment. The reason for this could be the nanostructured nature of the TiO₂ particles on the surface of the tiles.     

琉璃瓦非接触式颜色测量最优条件研究

为分析琉璃瓦非接触式颜色测量中不同测量条件对测量结果的影响,以X-Rite Spectro Eye分光光度计测得的数据为标准值,用非接触式颜色测量设备PR705光谱辐射度计获取琉璃瓦碎片的颜色信息,以不同的照明距离、测量距离、仪器曝光时间为试验条件,色差为试验指标,进行单因素试验和正交试验,并对试验结果进行极差分析与方差分析。试验结果显示:测量值与参考值的色差最小为1.0220,最大为1.6510,影响试验指标的因素主次顺序为照明距离、仪器曝光时间、测量距离,琉璃瓦非接触式测量参数的最优组合为照明距离1.5 m、仪器曝光时间2000 ms、测量距离1.0 m;最优测量条件下,色差更小,仅为1.0143。     

Ink-jet printing of gold conductive tracks

An organic gold precursor was dissolved to form a jet printing ink and deposited using a modified IBM piezoelectric drop-on-demand printer. The substrates were glass slides, glazed tiles and alumina plates. On firing in air, at temperatures below 500 °C, the gold pattern was developed on the substrate by decomposition of the organometallic compound to form tracks that were electrically conducting. The best quality conducting tracks were obtained on glazed tile or glass. The problems that can attend this process have been identified and include spreading and blistering of thick films on pyrolysis and delamination on cooling caused partly by differential thermal contraction. The thickness of the gold was 1.4 m per layer of deposition.     

Radioactivity level in Chinese building ceramic tile

The activity concentrations of (226)Ra, (232)Th and (40)K have been determined by gamma ray spectrometry. The concentrations of (226)Ra, (232)Th and (40)K range from 158.3 to 1087.6, 91.7 to 1218.4, and 473.8 to 1031.3 Bq kg(-1) for glaze, and from 63.5 to 131.4, 55.4 to 106.5, and 386.7 to 866.8 Bq kg(-1) for ceramic tile, respectively. The measured activity concentrations for these radionuclides were compared with the reported data of other countries and with the typical world values. The radium equivalent activities (Ra(eq)), external hazard index (H(ex)) and internal hazard index (H(in)) associated with the radionuclides were calculated. The Ra(eq) values of all ceramic tiles are lower than the limit of 370 Bq kg(-1). The values of H(ex) and H(in) calculated according to the Chinese criterion for ceramic tiles are less than unity. The Ra(eq) value for the glaze of glazed tile collected from some areas are >370 Bq kg(-1).     

消声瓦声参数匹配与水下目标的回波消声效果

覆盖消声瓦是水下目标隐身的一个主要方法,对敷瓦消声效果的预报是敷瓦工程的一个重要环节。预报的关键是对消声瓦吸声效果的数值分析和目标回波强度的计算方法。本文分析了消声瓦的吸声机理,据此,采用传递矩阵法和参数匹配方法求得敷瓦多层结构在任意方向的反射系数,再通过物理声学方法计算目标回波强度,给出预报值,并同实验结果进行了比较。     

Glass–ceramic glazes for ceramic tiles: a review

Glass–ceramics are ceramic materials produced through controlled crystallisation (nucleation and crystal growth) of a parent glass. The great variety of compositions and the possibility of developing special microstructures with specific technological properties have allowed glass–ceramic materials to be used in a wide range of applications. One field for which glass–ceramics have been developed over the past two decades is that of glazes for ceramic tiles. Ceramic tiles are the most common building material for floor and wall coverings in Mediterranean countries. Glazed tiles are produced from frits (glasses quenched in water) applied on the surface of green tiles and subjected to a firing process. In the 1990s, there was growing interest in the development of frits that are able to crystallise on firing because of the need for improvement in the mechanical and chemical properties of glazed tiles. This review offers an extensive evaluation of the research carried out on glass–ceramic glazes used for covering and pavement ceramic tile is accomplished. The main crystalline phases (silicates and oxides) developed in glass–ceramic glazes have been considered. In addition, a section focused on glazes with specific functionality (photocatalytic, antibacterial and antifungal activity, or aesthetic superficial effects) is also included.     

Design and evaluation of shock-absorbing rubber tile for playground safety

Rubber tiles are commonly used in playgrounds as protective surfacing to reduce the incidence of head injuries in children caused by falling from equipment. This paper presents a newly designed rubber tile consisting of a surface layer of solid and a base layer of honeycomb shape plate-cell. This tile was applied to investigate head injury protective performance. A validated technique combined with experimental and numerical methods was utilized to perform head impact on the rubber tile. The peak acceleration and head injury criterion (HIC) were employed to assess the shock-absorbing capability of the tile. The better protective ability of the honeycomb-core was attributed to its lower transverse shearing stiffness. As a result, the likelihood of establishing safe protection in playground and reducing severe child head injuries could be magnified.