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81.
分析了Φ315mm双极串联电渣锭发生崩块夹渣的原因,通过采取电极棒热重熔和电极棒埋砂缓冷等工艺措施,大幅度减少了电渣锭崩块夹渣缺陷。 相似文献
82.
采用商业软件ANSYS和FLUENT建立了电渣重熔过程渣池流场数学模型,分析了电渣重熔过程电磁力和热浮力共同作用下渣池流动行为,以及典型电渣重熔工艺参数(电极形貌、插入深度、填充比和电流强度)对电渣重熔过程渣池内流场的影响规律.结果表明:电磁力有利于渣池内产生逆时针涡流,浮力有利于渣池产生顺时针涡流.电极端部形貌对渣池流动影响较大,当电渣重熔电流均为5000A,频率为50Hz时,平头电极所在渣池内同时存在逆时针涡流和顺时针涡流,锥形电极所在渣池内只存在逆时针涡流.电极填充比和电流都对渣池内流动行为影响较大,减小电极填充比和增大电流强度都会使渣池内逆时针涡流增加. 相似文献
83.
目前,采用电渣重熔(ESR,electroslag remelting)还原稀土渣是一种有效的稀土添加工艺,而稀土氧化物的加入势必会改变渣系熔化性质,进而影响ESR工艺顺行及稀土钢质量。基于分子离子共存理论(IMCT)建立了CaF2-CaO-Al2O3-MgO-Ce2O3五元渣热力学模型,从热力学角度分析了渣中各组元对Ce2O3活度的影响规律。采用半球法测定了不同Ce2O3含量和w((CaO))/w((Al2O3))(C/A)条件下渣系熔点,结合SEM-EDS和XRD对渣系物相和微观形貌进行测试与分析。研究结果表明,当温度为1 873 K时,C/A、MgO、Ce2O3含量增加均增加渣系中Ce2O3的活度,且影响顺序为Ce2O3>C/A>MgO;w((Ce2O3))≥18%、w((MgO))≥4%以及C/A≥1.1时,钢中的铈元素不再烧损。随着Ce2O3添加量由0增加到24%,渣系熔点呈先降低后增加的趋势,加入少量Ce2O3能够促进稀土渣系熔点降低。但过量的Ce2O3会导致渣系中生成较多高熔点相2CeAlO3,从而使得稀土渣系的熔点升高。随着C/A从1.1增加至1.4,渣系的熔点呈降低趋势,主要原因是高熔点物相减少,导致稀土渣系熔点降低。试验测得的平衡铈含量与理论计算值相差不大,且变化趋势一致。渣金平衡试验证明了w((Ce2O3))为18%~20%能够减少铈元素的烧损,进一步证明该热力学计算模型和根据该模型得到的五元渣系范围是正确的。抑制稀土元素烧损的最佳渣系配比范围为w((CaF2))/w((Al2O3))=1.4、w((Ce2O3))=18%~20%、w((MgO))=4%~5%、w((CaF2))=50%~60%,为稀土渣ESR提供理论指导。 相似文献
84.
The mass loss rate of CaF2-CaO-Al2O3-SiO2-MgO slag system originated from ANF-6 was studied with CaF2, CaO, Al2O3, SiO2 or MgO content as variables. The method of quadratic regression orthogonal design was used for the design and analysis of the experiment. The experimental results indicated that mass loss rate of slag can be increased by 6% with CaF2 changing from 50% to 65%. Mass loss increases with SiO2, Al2O3 and MgO adding and decreases with CaO content increasing. Because of the reaction between oxide and fluoride in the slag pool, apparent mass loss of CaF2-Al2O3-CaO-SiO2-MgO slag system appears at melting point. This will cause obvious composition change of electroslag. In addition, the segregation occurs in the slag skin forming process. This is another reason causing the composition change of electroslag. 相似文献
85.
The hydrides in industrial lime, alumina, magnesia and calcium fluoride were investigated through differential thermal analysis, X-ray diffraction. The characteristic of losing weight during heating up for them had been studied by thermogravimetric analysis method. Results indicate that industrial alumina, lime, magnesia, which have more moisture or hydride mainly including γ-Al2O3, Ca (OH)2 and Mg(OH)2, and losing weight more during thermogravimetric analysis process. However, the weight of premelted slag consisting of lime, fluorite, alumina and magnesia lose almost nothing, which means no hydride in it. Some relationship for calculating the weight loss process had been established according to results of thermogravimetric analysis. These results will be in favor of setting up the rational calcination criterion for slag used in electroslag remelting process. 相似文献
86.
Based the self designed electroslag remelting furnace with electromagnetic stirring, the effect of external magnetic field on the number, size and type of inclusions in 304 stainless steel electroslag ingot was analyzed in detail. The content of oxygen and nitrogen in electroslag ingot was analyzed by ONH analyzer, and the morphology and element distribution of inclusions were observed by SEM. Finally, the ASPEX was used to analyse the size, number and type of inclusions. The results show that the oxygen content in electroslag ingot increases from 23.7×10-6 in consumable electrode to 64.70×10-6 whether magnetic field is applied or not, and the oxygen content increases to 67.4×10-6 at most from 23.7×10-6 in the electrode. But the nitrogen content in electroslag ingot decreased slightly to 659.3×10-6 from 675.5×10-6 in the electrode. The magnetic field has almost no effect on the type of inclusions, which mainly includes Al2O3, MnS-Al2O3, Al-Si-O, Al-Ca-O, Al-Si-Ca-O, Al-Mg-O and other inclusions. After the magnetic field is applied, the amount of large inclusions in electroslag ingot decreases, but the total number of inclusions increases when the magnetic induction intensity is small. When the magnetic induction intensity is 10 mT, the number of inclusions increases by 42.60%, but the maximum size of the inclusions decreases. 相似文献
87.
利用ZrO_2固体电解质氧浓差电池测定了电渣重熔用CaF_2+Al_2O_3和CaF_2+Al_2O_3+CaO系熔渣的氧渗透率,考察了熔渣成分及温度对熔渣传氧性能的影响.在1673—1873K和0.1MPa的氧气氛下,侧得这两个渣系熔渣的氧渗透率分别为1×10-(20)—6×10-(19)和1×10 ̄(21)—5×10 ̄(18)molO_2·cm ̄(-1)·s ̄(-1);随MnO_2,Fe_2O_3,Cr_2O_3,TiO_2,CaF_2含量和碱度(CaO/SiO_2)的增高,熔渣的氧渗透率增大,MnO_2和Fe_2O_3的影响尤为显著;随温度的升高,熔渣的氧渗透率增大,且可按速率过程来处理CaF2基多元复杂熔渣的传氧过程。 相似文献
88.
ESR用渣和整个操作中的各个过程有着密切的关系.实践表明虽然采用的是同一成分渣,含氟渣系在电渣冶金过程中成分会发生不断变化.渣组成的变化导致工艺过程中炉渣性能的变化,直接影响到电渣冶金工艺过程及电渣冶金产品质量.对电渣冶金过程炉渣成分及其对熔点、电导率等的影响进行了测定,对造成炉渣成分变化的原因进行了初步分析,对炉渣成分变化对电渣冶炼工艺及产品质量的影响进行了讨论. 相似文献
89.
Xiaona Hu Wei Chen Deping Lu Lei Lu Jingxuan Jia Huicheng Li Jin Zou Qiang Hu 《国际钢铁研究》2024,95(2):2300035
An electroslag casting method is used to add rare-earth La to M2 high-speed steels by adding La2O3 into the molten slag. The effects of the La content on the microstructure and mechanical properties of M2 high-speed steel are studied. The results show that rare-earth La is effectively added to steel by taking advantage of the decomposition of La2O3. The rare-earth La partially modifies the pre-existing oxide and sulfide inclusions into small and spherical rare-earth oxysulfide inclusions. By adding an appropriate amount of La, the as-cast iron dendrite matrix and coarse eutectic carbides can be refined, the carbide content is reduced, the carbide network is broken, and the decomposition of M2C into M6C and MC is promoted. After heat treatment, the network breaking and spheroidalization of the carbides are further facilitated, and the carbide content is reduced. The impact toughness and bending strength of the studied samples are improved by modifying the inclusions and optimizing the microstructure. 相似文献
90.