Aluminium--chromium (1/2) | 12250-84-9

• 分子结构分类: 有机化合物 - 有机杂环化合物
• 英文名称: Aluminium--chromium (1/2)
• 英文别名: alumane;chromium
• CAS: 12250-84-9
• 化学式: AlCr₂
• 分子量: 130.974
• InChiKey: QPRDBUWRXPGXRF-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -1.19
• 重原子数：
  3
• 可旋转键数：
  0
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.0
• 拓扑面积：
  0
• 氢给体数：
  0
• 氢受体数：
  0

反应信息

• 作为反应物：
  描述：

  甲烷 、 Aluminium--chromium (1/2) 以 neat (no solvent) 为溶剂， 1400.0 ℃ 、20.0 MPa 条件下， 反应 1.0h， 生成 chromium aluminum carbide
  参考文献：
  名称：

  Oxyacetylene torch testing and microstructural characterization of a Cr2AlC ceramic

  摘要：

  Cr2AlC has excellent oxidation resistance, thermal shock resistance, and crack healability, making it a potential candidate for use in high temperature applications. So far work on the high temperature ablation properties of Cr2AlC has been less focused. This work firstly demonstrated the high temperature ablation behavior of Cr2AlC through the oxyacetylene torch testing. The linear and mass ablation rates were determined. The microstructure and the phase composition of the ablated samples were characterized with scanning electron microscopy and X-ray diffractometry. This work provided a basic understanding of the high temperature corrosion mechanism of Cr2AlC. (C) 2018 Elsevier B.V. All rights reserved.

  DOI：

  10.1016/j.jallcom.2017.12.373
• 作为产物：
  描述：

  铬 、 氢化铝 以 neat (no solvent) 为溶剂， 生成 Aluminium--chromium (1/2)
  参考文献：
  名称：

  三元体系：CrAlC，VAlC和TiAlC以及H相（M 2 AlC）的行为

  摘要：

  已经研究了三元体系CrAlC，VAlC和TiAlC中的相位关系。证实了所有先前报道的三元H相Me 2 AlC（Me = Cr，V，Ti）和钙钛矿相Ti 3 AlC。找不到新的三元相。在1000℃下，Ti 2 AlC和Ti 3 AlC共存。另外，发现H相与TiC 1- x，TiAl 3和TiAl处于平衡状态。具有TiC 1- x，Ti 3 Al和Ti的钙钛矿（固溶有Al）。TiC 1- x与Al（l）在高于800°C的温度下共存。V 2 AlC与Al在1000°C共存4 Ç 3，铝（1），铝3 V，V' 7的Al 8，V（用Al固溶体），V 2 C，ζ-VC 1- X，和VC 1- X（包括V 8 C ^ 7）。在1000℃下的Cr 2 ALC是在用Al平衡4 Ç 3，γ-铬5的Al 8，铬（用Al固溶体），CR 7 Ç 3和Cr 3 C ^ 2。在800℃下的Cr 2 ALC共存也与石墨和β铬2的Al。V

  DOI：

  10.1016/0022-4596(80)90569-1

文献信息

• Synthesis of high purity Cr₂AlC nanolamellas with improved tribological properties for oil-based additives
  作者：Maoquan Xue、Xianghua Zhang、Hua Tang、Changsheng Li

  DOI：10.1039/c4ra06719c

  日期：——

  (molar ratio, x = 1, 1.1, 1.2) powder system between 1300 °C and 1400 °C with preliminary magnetic stirring mixing in alcohol. The purity of Cr2AlC is sensitive to the final temperature and raw material scale, and the excess Al plays a distinct role in improving the purity of the Cr2AlC. The tribological properties of Cr2AlC as an additive in 100SN base oil were evaluated by a UMT-2 ball-on-disc friction

  在此，提出了一种新颖的简单方法，通过在1300℃至1400℃之间的温度下加热2Cr / x Al / C（摩尔比，x = 1，1.1，1.2）粉末体系来合成高纯度的Cr 2 AlC粉末在酒精中搅拌混合。Cr 2 AlC的纯度对最终温度和原料规模敏感，过量的Al在改善Cr 2 AlC的纯度方面起着明显的作用。用UMT-2圆盘摩擦和磨损测试仪评估了Cr 2 AlC作为100SN基础油中添加剂的摩擦学性能。结果表明，在确定的条件下，基础油中含有0.6 wt％的Cr 2ALC样品呈现10 N中的负载下具有良好的性能摩擦学改善在Cr的摩擦学性能2 ALC样品可以归因于在摩擦处理的摩擦膜的形成。
• Microstructure and High-Temperature Corrosion Behavior of a Cr?Al?C Composite
  作者：Zhijun Lin、Meishuan Li、Jingyang Wang、Yanchun Zhou

  DOI：10.1111/j.1551-2916.2007.02059.x

  日期：——

  A Cr–Al–C composite was successfully synthesized by a hot‐pressing method using Cr, Al, and graphite as starting materials. X‐ray diffraction, scanning electron microscopy, and transmission electron microscopy analyses revealed that the composite contained Cr2AlC, AlCr2, Al8Cr5, and Cr7C3. The orientation relationships and atomic‐scale interfacial microstructures among Cr2AlC, AlCr2, and Al8Cr5 are presented. This composite displays both excellent high‐temperature oxidation resistance in air and hot‐corrosion resistance against molten Na2SO4 salt. The parabolic rate constants for the oxidation in air at 1000°, 1100°, and 1200°C are 3.0 × 10−12, 6.2 × 10−11, and 6.2 × 10−10 kg2 (m4·s)−1, respectively, while the linear weight gain rates for the hot corrosion of Na2SO4‐coated samples at 900° and 1000°C are, respectively, 1.2 × 10−3 and 4.4 × 10−3 mg (cm2·h)−1. The mechanism of the excellent high‐temperature corrosion resistance can be attributed to the formation of a protectively alumina‐rich scale.

  通过热压法，以Cr、Al 和石墨为原料，成功合成了一种Cr–Al–C 复合材料。X 射线衍射、扫描电子显微镜和透射电子显微镜分析表明，该复合材料包含Cr₂AlC、AlCr₂、Al₈Cr₅和Cr₇C₃。Cr₂AlC、AlCr₂和Al₈Cr₅之间的取向关系以及原子尺度的界面微观结构得到了展示。在空气中，该复合材料表现出优异的高温氧化抗性，同时对熔融的Na₂SO₄盐具有良好的抗热腐蚀性。在1000°C、1100°C和1200°C下，空气中的氧化抛物线速率常数分别为3.0 × 10⁻¹²、6.2 × 10⁻¹¹和6.2 × 10⁻¹⁰ kg²(m⁴·s)⁻¹。同时，Na₂SO₄涂层样品在900°C和1000°C下热腐蚀的线性质量增益速率分别为1.2 × 10⁻³和4.4 × 10⁻³ mg(cm²·h)⁻¹。该复合材料优异的高温抗腐蚀性能可归因于保护性富氧化铝层的形成。
• Theoretical and Experimental Exploration of a Novel In-Plane Chemically Ordered (Cr_2/3M_1/3)₂AlC <i>i</i>-MAX Phase with M = Sc and Y
  作者：J. Lu、A. Thore、R. Meshkian、Q. Tao、L. Hultman、J. Rosen

  DOI：10.1021/acs.cgd.7b00642

  日期：2017.11.1

  We have uncovered two inherently laminated transition metal carbides, (Cr2/3Sc1/3)2AlC and (Cr2/3Y1/3)2AlC, which display in-plane chemical order in the carbide sheet and a Kagomé pattern in the Al layer. The phases belong to the most recently discovered family of so-called i-MAX phases. The materials were synthesized and the crystal structures were evaluated by means of analytical high resolution scanning transmission electron microscopy, selected area electron diffraction, and X-ray diffraction Rietveld refinement. An orthorhombic structure of space group Cmcm (#63) and a monoclinic structure of space group C2/c (#15) are solved. The compounds were investigated by first-principles calculations based on density functional theory, suggesting close to degenerate anti-ferro- and ferromagnetic spin states, dynamical and mechanical stability, and a Voigt bulk modulus in the range 134–152 GPa.

  我们发现了两种固有层状过渡金属碳化物--(Cr2/3Sc1/3)2AlC 和 (Cr2/3Y1/3)2AlC，它们在碳化物薄片中显示面内化学有序，在铝层中显示卡戈梅模式。这些相属于最近发现的所谓 i-MAX 相家族。这些材料是通过高分辨率扫描透射电子显微镜、选区电子衍射和 X 射线衍射里特维尔德细化分析法合成的，并对晶体结构进行了评估。解决了空间群 Cmcm 的正方体结构（#63）和空间群 C2/c 的单斜结构（#15）。通过基于密度泛函理论的第一原理计算对这些化合物进行了研究，结果表明它们具有接近退化的反铁磁自旋态和铁磁自旋态、动态和机械稳定性，以及在 134-152 GPa 范围内的 Voigt 体积模量。
• Nanocrystalline intermetallic compounds in the Ni–Al–Cr system synthesized by mechanical alloying and their thermodynamic analysis
  作者：A.R. Shirani Bidabadi、M.H. Enayati、E. Dastanpoor、R.A. Varin、M. Biglari

  DOI：10.1016/j.jallcom.2013.07.037

  日期：2013.12

  Mechanical alloying (MA) of the ternary Ni-Al-Cr mixtures having the Ni50Al50, Ni25Cr25Al50 and Ni50Cr25-Al-25 compositions was investigated. The structural changes of powder particles during mechanical alloying were studied by X-ray diffractometry (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The results show that for all three compositions the gradual interdiffusion of elements during MA leads to the development of different phases. The final structures for the Ni50Al50 and Ni25Cr25Al50 compositions are nanocrystalline NiAl and (Ni, Cr)Al intermetallic compounds, respectively. However MA of the Ni50Cr25Al25 composition led to the formation of a Ni3Al intermetallic compound as well as Cr which transformed to the (Ni, Cr)(3)Al intermetallic compound after subsequent heat treatment. The structural transition upon annealing was investigated. Furthermore, thermodynamic analysis using the Miedema model for all three systems is carried out and discussed in detail. (C) 2013 Elsevier B.V. All rights reserved.
• The reaction mechanism for the low temperature synthesis of Cr2AlC under electronic field
  作者：Hyeon-Cheol Oh、Sea-Hoon Lee、Sung-Churl Choi

  DOI：10.1016/j.jallcom.2013.10.152

  日期：2014.2

  The synthesis mechanism of Cr2AlC powder using Cr/Al/C and Cr/Al/Cr3C2 systems through pressureless spark plasma sintering was studied in the temperature range of 700-1200 degrees C under an argon atmosphere. The modified mold was applied in order to synthesize a large quantity powder without pressure, which synthesized 60 g of powder at a once. The synthesis temperature was strongly dependent on the starting composition. For Cr/Al/C system, Cr2AlC with a very small amount AlCr2 was synthesized at 1200 degrees C. For Cr/Al/Cr3C2 system, high purity Cr2AlC powder was synthesized at 1000 degrees C. The synthesis of Cr2AlC powder at low temperature was attributed to the combination of a current effect by spark plasma sintering and the introduction of milled Cr3C2 as carbon source. Transmission electron microscopy analysis indicated the dissolution of Cr3C2 in molten Al, the precipitation of needle-like Al4C3 grains and the formation of Cr2AlC in the liquid phase. (C) 2013 Elsevier B. V. All rights reserved.