10000t/a汽车用橡胶制品专用碳黑系列产品通过鉴定

国家重点技术创新项目“1 0 0 0 0ｔ/ａ汽车用橡胶制品专用碳黑系列产品”日前在中橡集团炭黑工业研究设计院通过了由国家经贸委组织的专家鉴定验收。该系列产品的开发成功 ,可有效改变以往国内汽车用橡胶制品的主要原材料———碳黑只能使用普通碳黑或靠引进国外产品配套的局面 ,可有效提高汽车用橡胶制品的耐老化性能、耐冲击性能、压缩变形性能 ,提高橡胶产品的外观质量及与金属的粘着力等。其产品质量达到国外同类产品的水平 ,填补了国内该类产品的空白。10000t/a汽车用橡胶制品专用碳黑系列产品通过鉴定     

化肥碳黑在循环流化床锅炉上的应用

通过对镇海炼化公司化肥DOA碳黑及CFB锅炉底渣的研究，提出DOA碳黑与CFB锅炉底渣1：1．3混合后，可做为CFB锅炉燃料。工业应用试验表明，化肥DOA碳黑与CFB锅炉底渣混合后，碳黑可充分燃烧，飞灰残炭含量有所降低，并且底渣中的活性组分参与脱硫，烟气中二氧化硫含量也有明显下降。     

第四代橡胶用碳黑通过鉴定

目前,由中橡集团碳黑工业研究设计院研制的橡胶用炭黑新品种DZ-11、DZ-13,在自贡市通过了国家鉴定。 　　DZ-11、DZ-13属于第四代橡胶用碳黑—低滞后碳黑品种。填充此类炭黑的轮胎,可降低汽车的油耗,减少废气排放量。生产DZ-11、DZ-13碳黑的反应炉,生产工艺稳定,能耗低。产品物化指标达到ASTM标准和GB3778标准同类碳黑的要求。 　　经多家单位应用研究表明,DZ-11、DZ-13碳黑用于天然橡胶,合成橡胶和并用橡胶配方中,在其它性能相近的情况下,滚动阻力比同类新工艺碳黑低15%、25%,DZ-11、DZ-13的研制成功,对提高我国碳黑生产技术水平和推动轮胎行业的发展有重要意义。     

碳黑作为替代燃料在水泥工业中的应用

在水泥工业节能降碳主旋律下,通过在水泥窑中高质化利用废轮胎衍生燃料碳黑,从生产安全、产品性能、生产运营指标等方面验证碳黑在水泥工业中作为替代燃料利用的可行性,阐述其在水泥生产中降低燃料成本、降低碳排放量的经济和社会收益。     

聚乙烯土工膜中碳黑、氧化诱导时间及灰分之间的影响研究

氧化诱导时间(OIT)和碳黑含量、分散以及灰分均为检测聚乙烯复合土工膜材料的重要指标。对聚乙烯土工膜产品碳黑和OIT进行试验研究,得出了聚乙烯土工膜产品中碳黑与OIT的影响关系:当碳黑分散度在1~2级的范围内,随着碳黑含量的增加,OIT数值也不断增大;而碳黑分散度在1~3级的范围内,此时试样的碳黑粒子分布不均匀,并存在聚集体,碳黑含量和OIT数值没有相关联系。在OIT测试时,当试验恒温温度及气体等条件相同时,在试样质量为14.5~15.5 mg的范围内,得出了试样质量的变化对土工膜材料的OIT值并无线性影响。采用GB/T 13021—2000和GB/T 9345.1—2008两种方法对聚乙烯土工膜产品灰分含量进行测定和比较,结果表明:两种方法所测定的试样中灰分含量存在一定的差异,其中采用GB/T9345.1的方法反映了聚乙烯土工膜真实的灰分含量,并建议修订GB/T 17643时增加灰分含量技术要求及方法。     

分散剂及碳黑对黑度的影响

采用不同的分散剂研磨分散进口高色素碳黑及国产高色素碳黑,结果显示分散剂对碳黑的黑度、黏度有非常明显的影响。合适的分散剂可以得到低黏度、低触变性、高黑度及偏蓝色色相的碳黑浆。     

添加元素对Zr1-xTix(NiCoMnV)2.1电极性能的影响

通过添加不同的导电剂和添加剂,制备了Zr1-xTix(NiCoMnV)2.1贮氢合金负极片,测试了不同负极片的放电容量. 结果表明：以镍粉为导电剂的Zr1-xTix(NiCoMnV)2.1负极片性能明显高于以碳黑为导电剂的负极片, 添加银粉的负极片初始容量能达到215 mA×h/g,平台K值大于90%.     

添加无素对Zr1—xTix（NiCoMnV）2.1电极性能的影响

通过添加不同的导电剂和添加剂,制备了Zr1-xTix(NiCoMnV)2.1贮氢合金负极片,测试了不同负极片的放电容量,结果表明以镍粉为导电剂的Zr1-xTix(NiCoMnV)21负极片性能明显高于以碳黑为导电剂的负极片,添加银粉的负极片初始容量能达到215mA,h/g,平台K值大于90%,     

专利信息

改进的转化碳黑及其制备方法公开号 :12 32 84 2　　申请人 :德古萨—于尔斯股份公司公开了一种转化碳黑及其制备方法。该转化碳黑具有更小的滚动阻力以及同样的或改善了的湿滑性能。其粒度分布中大直径的颗粒所占的比例较小。用这种碳黑制备的橡胶组合物就会具有一种改善了的磨损效应。通过控制燃烧室中的燃烧 ,使碳黑核形成 ,并使碳黑核立即与碳黑原料接触 ,这样就可以在传统的碳黑反应器中来制备转化碳黑。如果通过合适的方式增加燃烧空气和碳黑原料的加入量 ,则可以使所形成的碳黑中较大的颗粒所占的比例较小。 (发明人 :康尼·福格勒 ;…     

控制碳黑反应炉温的新方法

据美国专利3993447报导,美国菲利蒲石油公司通过控制加入碳黑反应炉燃烧室的燃料及空气的速度,用电子计算机来控制碳黑高温反应炉的炉温。占碳黑总产量90％以上的油炉法碳黑,通常是借助液态烃在特制的碳黑反应炉内热裂解制造的。烃热裂解所需的热量,一般是     

The effect of tungsten buffer layer on the stability of diamond with tungsten carbide–cobalt nanocomposite powder during spark plasma sintering

WC–Co nanocomposite powder produced by spray pyrolysis–continuous reduction and carbonization technology, diamond coated with tungsten (W) by vacuum vapor deposition and uncoated diamond were used in this study. This work adopted the spark plasma sintering (SPS) process to prepare diamond-enhanced ultrafine WC–Co cemented carbide composite material. The effects of W buffer on the stability of diamond with WC–Co nanocomposite powder during SPS were investigated. Results showed that the uncoated diamond was mechanically embedded in WC–Co cemented carbide matrix, while the diamond coated with tungsten was combined chemically with WC–Co cemented carbide matrix. Moreover, there was a transitional layer between the diamond and the matrix which could improve the thermal stability of the diamond, prevent carbon atom of the diamond from dissolving in Co phase and increase the bonding strength of the interface between the diamond and the matrix.     

Room-Temperature Thermal Conductivity of Cemented Transition-Metal Carbides

Measurements are reported of the room-temperature thermal conductivity of cemented multicarbides (WC-TiC _x -NbC _x -TaC _x /Co) and straight tungsten carbide (WC/Co), which are widely used tool materials. The thermal conductivity of cemented titanium carbide was found to be lower than that of cemented tungsten carbide. The difference is attributed to strong phonon and electron scattering from carbon atom vacancies in the nonstoichiometric cubic carbide TiC _x ; these defects are absent in stoichiometric hexagonal WC. Higher binder contents in tungsten carbide samples lowered the overall thermal conductivity. Scattering of electrons and phonons by C and W atoms in solid solution in the binder phase presumably reduces its thermal conductivity. No dependence on grain size was detected.     

Effect of carbon nanotubes additives on mechanical properties of WC–6Co cemented carbide

In order to increase the toughness of WC–6Co cemented carbide, different contents of carbon nanotubes (CNTs) were added to the WC–6Co alloy powder to prepare cemented carbide by low-pressure sintering. The results showed that some of the CNTs were embedded between the grains of WC–6Co cemented carbide, which would hinder the growth of WC grain boundary, thus leading to grain refinement. In addition, CNTs inhibited the formation of decarbonized phase and guided the deflection and bridge of crack to hinder the crack extension. With the increase of CNTs content, the density increased at first and then decreased, and the transverse fracture strength increased at first and then decreased. When the content was 0.2 wt.%, the alloy had the best performance. The density of the alloy was 99.67%; the transverse fracture strength was up to 2937.5 MPa, which is about 100% higher than that of cemented carbide without CNTs. The fracture toughness was 9.84 MPa m^1/2, and the hardness was 1924.8HV₃₀.     

超细碳化钨制备过程及机理研究进展

超细碳化钨（WC）具有硬度高、耐磨性好、强度高和韧性较高的特点,是制备硬质合金最基础的原料。因此,超细碳化钨的制备成为学术界和工业界关注的焦点,也是硬质合金制备领域研究的重点。从反应体系的角度综述了超细碳化钨粉体制备技术,对相关反应路径机理进行了分析,并展望了超细碳化钨制备技术的发展趋势。     

High-Temperature Reaction Between Cemented Tungsten Carbide and Copper

Interdiffusion in the system cemented tungsten carbide-molten copper has been studied in the range ≤1120°C with special emphasis on the effects of WC grain size and Co content. Techniques used for analyzing the diffusion layers obtained are EPMA, optical microscopy, and microhardness measurement. A Cu-bonded WC layer develops with simultaneous diffusion of Co from the cemented carbide into the bulk copper. The Cu-bonded WC layer grows until a Co-rich layer forms at the Cu/WC-Co interface; further heating pushes the Cu-bonded WC layer deep into the bulk cemented carbide without any significant change in layer thickness. When the WC grain size is reduced and the cobalt content increased, the penetration of copper into cemented carbides increases. A tentative mechanism of interdiffusion has been proposed based on the experimental results.     

The two dimensional microstructure characterization of cemented carbides with an automatic image analysis process

The traditional two dimensional microstructure characterization of cemented carbide, based on stereology of linear intercept method, requires tedious and subjective manual measurements. In this study, an automatic image analysis procedure with two key techniques, i.e. maximum class square error method and watershed transformation method, has been successfully developed. The image analysis for WC-16Co cemented carbides with this procedure easily acquires consistent microstructure parameters. The analysis for area weighted WC grain size, as well as the subsequent mean free path of Co binder show quite different results compared with the conventional number weighted data. It is found that for both number weighted and area weighted data, the contiguity of WC/WC grains is insensitive to the variation of either mean WC grain size or mean free path of Co binder. The mean WC grain size is linearly related to the mean free path of Co binder. The hardness of cemented carbide, having a linear relationship with the inverse square root of mean WC grain size, conforms to Chermont and Osterstock's model. Although it is too early to conclude whether number weighted or area weighted WC grain size (and subsequent mean free path of Co binder) is better, this study shows that area weighted WC grain size and the corresponding mean free path of Co binder are more suitable for Chermont and Osterstock's hardness modeling compared with number weighted WC grain size. The area weighted WC grain size and subsequent mean free path of Co binder, which have rarely been considered for microstructure characterization of cemented carbide previously, could be the key parameters for a better understanding of the microstructure evolution, as well as a better mechanical behavior modeling for cemented carbide.     

Effect of WC particle size on the microstructure and mechanical properties of Ni–Co coarse grain cemented carbide

The effect of different WC grain size additions on the microstructure and grain distribution of Ni–Co coarse crystalline cemented carbide was studied. And then the effect of grain distribution on the mechanical properties of cemented carbide was discussed. The effect of WC grain size on the grain size and coherency of cemented carbide was analyzed by microstructure. And the distribution of grains in the microstructure was investigated by the truncation method. The addition of fine (1.1–1.4 μm), medium (2.3–2.7 μm), and coarse WC (5.6–6.0 μm) particles can increase the nucleation rate of WC grains in the bonded phase. And the higher grain growth driving force can produce the theoretical limitation of nucleation and inhibit the coarsening of WC grains to a certain extent. The WC grain size has an insignificant effect on the frequency of the occurrence of super-coarse grains in coarse crystalline cemented carbide. The average grain size and super coarse grains in microstructure gradually decrease, which promotes the improvement of transverse rupture strength. The increase of the adjacent degree and the decrease of the mean free path reduce which is beneficial to the improvement of the corrosion resistance of the alloy. The best overall performance of the alloy is achieved when fine-grained WC is added.     

陶瓷-硬质合金复合刀片材料的力学性能与界面结构

采用热压烧结工艺制备了刀具用陶瓷－硬质合金复合片．复合片上层为具有一定厚度的Ａｌ２Ｏ３／ＴｉＢ２陶瓷材料,下层为ＷＣ／Ｃｏ硬质合金．结果表明：复合片综合了陶瓷材料的高硬度和硬质合金的高强度,其性能介于陶瓷材料和硬质合金之间．Ｘ射线衍射、电子探针和扫描电子显微镜分析表明：烧结过程中硬质合金和陶瓷材料中的元素在界面相互扩散,并有新相形成,增加了界面结合强度,其界面为化合物型和扩散型的混合．     

Quantitative determination of the adhesive fracture toughness of CVD diamond to WC–Co cemented carbide

Well-separated diamond particles were nucleated and grown by hot filament chemical vapor deposition (HFCVD) onto WC–Co cemented carbide pretreated by Murakami’s reagent and H₂O₂+H₂SO₄ solution. The adhesive strength of diamond particles to WC–Co cemented carbide was quantitatively determined in terms of interface toughness by directly applying an external load to the CVD diamond particles. From the measurement of the maximum load required to scratch off the particles, we determined that the adhesive toughness was 14 J/m². This value is more than twice as high as that of CVD diamond on smooth silicon substrate and comparable to the cleavage fracture energy of diamond. The newly developed procedure will allow to check the effectiveness of substrate surface pretreatments for further improving the adhesion level of diamond films on WC–Co.     

Tool life and wear of WC–TiC–Co ultrafine cemented carbide during dry cutting of AISI H13 steel

WC–5TiC–10Co ultrafine cemented carbides were prepared and used for the cutting tool for AISI H13 hardened steel. The effect of cutting parameters on the tool life and tool wear mechanism was investigated, and conventional cemented carbide with the same composition and medium grain size were prepared for comparison. The results showed that WC–5TiC–10Co ultrafine cemented carbides possess higher hardness and transverse rupture strength, and showed better cutting performance than conventional insert with the same cutting condition. Tool life was analyzed by an extended Taylor's tool life equation, indicating that cutting speed played a profound effect on the tool life and wear behavior of both cutting inserts. SEM and EDS analysis revealed that there were major adhesive wear and minor abrasive wear on the rake of WC–5TiC–10Co ultrafine inserts, and increase of cutting speed resulted in a transition from abrasion predominant wear mechanism to adhesive wear on the flank face. As for the conventional inserts, there were combination of more serious abrasive and adhesive wear on the rake and flank. The favorable cutting performance of ultrafine WC–5TiC–10Co inserts was attributed to the higher hardness and less thermal softening during machining.