骨料密度对高纯氧化锆制品性能的影响

为了提高氧化锆制品的综合性能,设计了配料组成中骨料分别为65％(w)的电熔氧化锆致密颗粒、45％(w)的电熔氧化锆致密颗粒加20％(w)的电熔氧化锆空心球、65％(w)电熔氧化锆空心球三种骨料密度不同的试样,经混料、液压成型、烘干后,分别在1650、1720和1800℃保温6 h制成w(ZrO2+HfO2+Y2 O3)...     

电熔氧化锆粒度和晶型对锆系色料作用的机理和应用

根据氧化锆原料粒度和晶型对相应色料发色的作用机理,改进生产工艺来控制电熔氧化锆的相应参数,从而提高电熔氧化锆制备锆系色料的发色能力。     

专利信息

电熔氧化锆生产锆铁红色料的方法 本发明公开了一种电熔氧化锆生产锆铁红色料的方法,包括以下步骤：1）晶貌改形处理。将普通的电熔氧化锆粉,通过特殊装置进行氧化锆粉晶貌球化处理,使电熔氧化锆的形貌趋于接近球形状态;2）去除杂质。将步骤1）所得产物用稀酸进行洗涤至杂质Al2O3、Fe203、SiO2、P2O5等的含量各小于0．...     

氧化锆活性对烧结性能的影响

分别以化学法和电熔法制备的氧化锆及二者混合共磨粉为原料,通过造粒、成型、干燥、烧成制得样品,对烧成样品物理性能和微观结构进行分析,研究原料活性对烧结性能的影响.研究结果表明:在加入同样稳定剂的条件下,电熔氧化锆活性较差,烧结后气孔率较高,化学氧化锆烧结后收缩大,开裂严重,两者都无法满足作为制备氧化锆质定径水口基质原料要求,当二者的混合比例为1:1时,试样的烧结温度合适,气孔率、烧成收缩、耐压强度等各项理化指标较好,满足用作制备氧化锆质定径水口基质要求.     

环保型锆铁红色料的研制

本文介绍了利用电熔氧化锆代替化学二氧化锆生产锆铁红色料的研究和生产工艺,并阐述了电熔氧化锆合成锆铁红的机理,为新型陶瓷装饰材料生产的低污染、无公毒、绿色环保提供了借鉴和途径.     

氧化锆及其电熔复合耐火原料

本文对氧化锆的性能、制法、用途等作了比较完整和系统的叙述，并对其电熔复合耐火原料作了简单介绍。     

浅谈电熔氧化锆在陶瓷行业中的应用

本文对氧化锆的化学成分、物理特性进行了阐述,介绍了电熔法生产二氧化锆的生产工艺,及其在陶瓷色釉行业中的应用情况。     

电熔氧化锆规模化生产的新工艺

本文叙述了对传统电熔法氧化锆生产工艺的创新改进，新工艺太幅度提高了产品质量，降低了生产成本，且节能环保，适宜于大规模产业化生产。     

烧结多孔骨料制备高纯氧化锆隔热制品的性能研究

为研究烧结氧化锆多孔骨料为原料制备氧化锆制品的性能,分别以自制烧结氧化锆多孔骨料和市售氧化锆空心球为骨料,电熔氧化锆细粉和氧化锆微粉为基质,水溶性树脂为结合剂,液压成型试样经110℃干燥后于燃气窑内1800℃保温6 h烧成,检测了烧后试样的性能,分析了烧成试样的显微结构.结果表明:采用烧结氧化锆多孔原料为骨料制备的试样...     

氧化锆及掺杂氧化锆的研究进展

介绍了氧化锆的性质、制备方法及国内外研究现状,概述了掺杂氧化锆的研究进展,并对氧化锆及掺杂氧化锆的发展方向进行了分析和讨论。     

电熔氧化锆生产锆铁红色料的发色效果及应用

本文简要对比特种电熔锆与普通电熔锆、化学锆之间的物理化学性质的差异,并研究它们在不同条件下,制成的锆铁红色料的发色情况。结果表明:采用特种电熔锆生产的锆铁红色料,其发色效果及耐温性能等指标都达到甚至超过化学锆的标准,在工业化生产应用中取得了较好的效果。     

纳米氧化锆添加量对氧化锆制品性能的影响

在电熔单斜氧化锆原料中添加不同数量的CaO稳定剂,制备部分稳定氧化锆,研究CaO加入量和稳定相数量的关系.在制备的CaO部分稳定氧化锆中添加纳米氧化锆粉体,经过造粒、200 MPa压力成型、干燥、1650 ℃×2 h烧成制得试样.测试试样的物理性能、分析矿物相组成、观察显微结构,研究纳米氧化锆粉体添加量对试样性能的影响.研究结果表明:2Ca-PSZ、3Ca-PSZ、4Ca-PSZ试样中,4Ca-PSZ试样稳定化程度最高;3Ca-PSZ试样显气孔率小,体积密度较大,耐压强度高.在3Ca-PSZ试样中加入纳米氧化锆粉体,随着加入量的增加,试样的显气孔率下降、烧成收缩率增加、耐压强度提高.其中纳米氧化锆粉体添加比例为8wt%时,试样气孔率为9.4%,体积密度为5.08 g/cm3,抗压强度达到381 MPa.与3Ca-PSZ试样相比,气孔率下降40%,体积密度提高5%,耐压强度提高70%.     

锆刚玉加入对刚玉-尖晶石浇注料性能的影响

在刚玉-尖晶石浇注料的配比组成中分别加入ZrO2质量分数为28.46%和38.47%的两种电熔锆刚玉颗粒,研究了电熔锆刚玉颗粒的粒度(5～3、3～1和1～0.5 mm)、加入量(质量分数分别为3%、5%和8%)对刚玉-尖晶石浇注料的加热永久线变化率、烧后常温抗折强度、高温抗折强度及热震后弹性模量的影响,并观察了试样的显微结构。结果表明:1)试样的加热永久线变化率随锆刚玉粒度的增大而增大,随锆刚玉加入量的增多而增大,引入锆刚玉Z40的试样的加热永久线变化率基本上比引入锆刚玉Z25的大;2)烧后试样的常温抗折强度、高温抗折强度和弹性模量均以空白试样的为最大,均随锆刚玉粒度的减小而增大,随锆刚玉加入量的增多而减小;3)在刚玉尖晶石浇注料中适当加入锆刚玉而产生微裂纹,尽管降低了材料的强度和弹性模量,但对提高抗热震性有一定的积极作用。     

The controlled preparation and stability mechanism of partially stabilized zirconia by microwave intensification

Partially stabilized zirconia (PSZ) occupies an important application portion in ceramics materials and refractories materials. In this work, calcium oxide-partially stabilized zirconia (CaO-PSZ) ceramics were prepared from fused zirconia by microwave sintering, with its microstructure and stability properties characterized by XRD and SEM. Results indicated that the heating rate, cooling rate, quenching temperature and isothermal treatment time rendered different influence on the stability properties, which was mainly ascribed to the reversible martensitic transformation of zirconia ceramics. Additionally, a mixed-phase composed by cubic phase ZrO₂ (c-ZrO₂) and monoclinic phase ZrO₂ (m-ZrO₂) appeared after fused zirconia treated by microwave sintering at 1450 °C for 2 h, indicating the formation of CaO-PSZ ceramics, which the finding was consistent with the SEM and EDAX analysis. Meanwhile, CaO stabilizer precipitated behavior at the crystal boundary, with the formation of acicular grains and fine particles, further rendering a toughening effect to CaO-PSZ ceramics. This work can provide important theoretical and practical significance for applications of microwave sintering to prepare CaO-PSZ ceramics material, even extending further applications in functional materials and structural materials.     

Corrosion Resistance Mechanism of Magnesia Zirconia Brick to RH Furnace Slag

Magnesia zirconia brick containing 11 wt% zirconia was prepared with magnesia and monoclinic zirconia as starting materials in order to replace the chrome-containing materials for RH furnace.The corrosion resistance of magnesia zirconia brick and fused rebonded magnesia chrome brick (short for magnesia chrome brick) to high and low basicity slag of RH furnace was comparatively researched by rotary slag method and their slag resistance mechanisms were analyzed.The results show that:(1) because the reaction l...     

Crystallographic Texture and Thermal Conductivity of Zirconia Thermal Barrier Coatings Deposited on Different Substrates

The crystallographic texture and thermal conductivity of zirconia coatings deposited by electron beam evaporation on a variety of substrates have been measured. It was found that the thermal conductivity of coatings deposited at the same temperature was independent of whether they were deposited on polycrystalline alumina, single-crystal sapphire, single-crystal zirconia, or fused silica. The room-temperature thermal conductivity of the coatings deposited at 700°C was 0.32 W/(m·K), increasing to 1.36 W/(m·K) for coatings deposited at 1150°C. Similarly, the crystallographic texture was also independent of the substrate and had a (111) fiber texture at 700° and 900°C, switching to a (200) fiber texture by 1050°C. The exception was the coating deposited at 1150°C on (111) single-crystal zirconia which was epitaxial and exhibited a thermal conductivity of 2.46 W/(m·K). It is concluded that the properties of zirconia thermal barrier coatings are determined by the growth conditions rather than those associated with nucleation on the underlying substrate.     

Fundamental Optical Absorption Edge of Sputter-Deposited Zirconia and Yttria

Zirconia and yttria films were sputter deposited onto unheated fused silica substrates using a metal target and rare gas-oxygen discharges. Double-beam spectrophotometry was used to measure the transmission and reflection as a function of incident photon energy, E , from which the absorption coefficient, α( E ), was calculated. An indirect interband transition at E _i= 4.70 eV and two direct interband transitions at E _g1= 5.17 eV and E _g2= 5.93 eV occur in monoclinic zirconia. Two direct interband transitions at E _g1= 5.07 eV and E _g2= 5.73 eV occur in cubic yttria. The absorption edge structure is modified when unusual phases, such as tetragonal zirconia, and zirconia and yttria with no longrange crystallographic order, are present.     

Fatigue behaviours of the zirconia dental restorations prepared by two manufacturing methods

The fatigue behaviours were evaluated on a novel zirconia dental restoration known as self-glazed zirconia (SG), prepared by a precision additive 3D gel deposition approach, compared with a conventional zirconia (CZ) restoration, shaped by CNC milling of zirconia blanks made by cold isostatic pressing. Eight fixed partial dentures made by each method were subjected to fracture test, without or with the application of 5-million fatigue cycles, respectively. The processing defects, grain size, and t–m phase transformation were examined by SEM and XRD. The results revealed that the fracture force of the SG restorations was higher than that of the CZ restorations in both cases, which ascribed to the fact that more voids and larger grains in the conventional versus in the SG restorations. The t–m phase transformation was observed only on the fracture surfaces of both materials subjected to fatigue test. Both zirconia restorations meet the clinical requirement.     

二氧化锆及在钙处理钢滑板中的应用

介绍了二氧化锆的性质及在钙处理钢滑板中的应用,并对锆环的生产提出了建议.