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The degressive degree of the phase stability of t-ZrO〓 is not obviously, the t-ZrO〓 content decrease from 91% for ZrO〓 to 85% for composites.

但由于这种作用的程度较小,t相下降的幅度较小,1350℃热压烧结后,t-ZrO〓的含量由单相ZrO〓(3Y)中的91%下降至85%。

Nano particle after being dispersed fully is added into A1, TiO2 and C powder in the suspension, and through fully mixing and combusting composition, loose blank of nano composite Al2O3-TiC base ceramic is obtained; and the blank is crushed, ball milled and hot pressed to densify, nano composite Al2O3-TiC base ceramic is obtained, which ontains Al2O3 40-55 wt%, TiC 25-48 wt%, nano phase 0.1-25 wt% and sintering assistant 0-2 wt%.

以重量百分比计,将纳米粒子充分分散后,以悬浮液的形式加入Al、TiO2、C粉末中,经充分混合后进行燃烧合成,得到Al2O3-TiC基纳米复合陶瓷的疏松坯体;将燃烧合成所得的坯体破碎、球磨后,进行热压致密化处理,制得含有三氧化二铝40.0-55.0%,碳化钛25.0-48.0%,纳米相0.1-25.0%,烧结助剂0-2.0%的Al2O3-TiC基纳米复合陶瓷材料。

The influence of SiO2, Fe2O3 on the thermal conductivity, melting point of risers covering flux were studied in the paper and the effect of dilative graphite on expansibility and heat-insulating property were also investigated. The high temperature microstructures and the thermal insulation mechanism were researched by scanning electron microscope.

在综合硅酸盐相图理论知识及大量国内外研究资料的基础上,着重研究SiO2、Fe2O3对保温冒口覆盖剂的导热系数、熔化温度的影响,以及膨胀石墨对冒口覆盖剂膨胀性和保温性能的影响,并利用扫描电镜分析了冒口覆盖剂高温烧结微观组织形貌及其保温机理。

The adopted preparation method comprises the following steps: paper fibre or porous organism is used as a hard template; CoFeFe-LDH is synthesized in the surface and holes of the hard template and roasted to prepare the magnetic cobalt iron ferrite; as the function for fixing the houghite position is produced by the obstruction and adsorption of the hard template, the occurrence of the sintering phenomenon is greatly avoided, thereby preparing the magnetic cobalt iron ferrite with a consistent shape and even granularity.

所采用的制备方法是以纸纤维或多空有机物为硬模板、在硬模板表面及孔内合成Co 2 Fe 2 Fe 3 -LDH,再经焙烧得到磁性钴铁铁氧体,由于硬模板的阻隔和吸附而产生的水滑石位置固定作用,极大地避免了烧结现象发生;从而得到形状一致、粒度均匀的钴铁铁氧体。

Under the sametemperature, with the increase of the quantity of the additions, the density hasincreased, and the variation of the mechanical properties of these materialsdepended on the density and the quantities of the second-phase particle and intercrystalline phase of these materials.

随着烧结添加剂量的增加,在相同温度下材料的致密度上升,力学性能的变化与材料中的致密度、第二相粒子及晶间相有关。

The dehydration and transformation into suanite of decomposed of szaibelyite at about 700℃ is the main reason of ludwigite weight loss, It was found by XRD that paigeite and magnoferrite are the most stable component without phase tromsformation during oxidizing roasting.

硼镁石在700℃左右分解脱掉结构水形成遂安石,硼镁石的分解是造成硼铁矿大量失重的主要原因。通过XRD分析可知矿石中的镁铁矿相、硼铁矿相为最稳定相,在硼铁矿原矿焙烧过程中不发生相变。为硼铁矿烧结-冶炼工艺提供了必要的理论依据。

The results showed that the three kinds of prealloy powder have excellent low temperature sintering characteristics and good wear resistance. They have excellent physical and mechanical characteristics close to ultrafine cobalt and imported prealloy powder, good retention to diamond and excellent bonding momental for high frequency brazing. At one time, they have lower cost and reduced dosage.

结果表明:三种预合金粉末有着优良的低温烧结性能和耐磨性,表现出接近于超细钴和相当于国外代钴粉末的优良的物理、机械性能,对金刚石把持力高;具有高的高频钎焊结合力矩;粉末成本较低,用粉量可降低。

The Y-TZP nanoceramics with an average grain size of 60 nm and a relative density of 98% were prepared by pressureless sintering.

采用无压烧结获得了相对密度为98%、平均晶粒尺寸为60nm的Y-TZP纳米陶瓷。Y-TZP纳米陶瓷的显微硬度主要取决于陶瓷的相对密度、相结构和晶粒尺寸,即陶瓷的四方相质量分数越高,相对密度越大,晶粒尺寸越小,则显微硬度越高。

The results indicate that adding some nano-aditives can reduce the sintering temperature, and the nano-aditives restain the growing up of tungsten crystal particles.

研究结果表明:加入纳米添加剂可降低烧结温度;选用的纳米添加剂对钨晶粒的长大起了抑制作用,细化了W-Ni-Cu合金的晶粒;适量的纳米添加剂大部分分布于Ni-Cu粘结相中。

Synthesis and Thermoelectric Properties of Nano-Skutterudite Compounds by Chemical Methods;2. Thermoelectric Properties and Nanostructuring of Skutterudites;3. The synthesis approaches and its characteristic of skutterudite compounds,such as smelting,solid-state reaction,mechanical alloying and spark plasma sintering etc were reviewed.

回顾了熔融法、固相反应法、机械合金化和放电等离子烧结技术等方钴矿热电材料的制备方法及其特点,重点阐述了在方钴矿化合物中固溶Fe,Ni等元素,以及在方钴矿化合物中填充碱土或稀土元素对热电性能的改进;同时介绍了低维化对方钴矿化合物的热电传输特性的影响。

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