共查询到20条相似文献,搜索用时 156 毫秒
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蔡兆勋 《有色金属材料与工程》1987,(4)
一种用热等静压(HIP)和快速凝固(RS)相结合的方法制作新陶瓷,为解决热机和其它苛刻条件所用的高级陶瓷生产中面临的难题带来了希望。HIP/RS作为先进的新方法,将根据Battelle计划进行研究。这种陶瓷材料在热机部件、切割工具及轴承等方面有广 相似文献
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昌曼丽 《稀有金属与硬质合金》1990,(2):63-64,F003
近几年来,粉末冶金陶瓷和特种碳工业的发展速度相当快。在所采用的成型与烧结工艺中,热等静压工艺正在越来越引起人们的重视。日本神户钢公司于1974年研制出自己的第一台热等静压设备,目前该公司已向用户提供130多台HIP设备。本文论述了HIP的最新发展趋势,同时还介绍了该公司生产的新型HIP设备。 相似文献
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《有色金属材料与工程》2018,(6)
通过设计浆料配方和设置打印参数,采用光固化增材制造(3D打印)的方法制备出氮化硅陶瓷样品。通过热重-差示扫描量热(TG-DSC)分析得到脱脂温度,确定了脱脂预烧结和高温陈化烧结工艺,得到了氮化硅陶瓷样品。试验结果:氮化硅陶瓷样品收缩率为水平方向65.1%,厚度方向80.0%;密度达到理论值的93.3%;抗拉强度为245.9~279.8 MPa,抗弯强度为308.5~333.2MPa。平面方向收缩较大,可能引起了拉伸时的层状撕裂。 相似文献
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一、高温结构用陶瓷概要日本黑崎窑业(株)的氮化硅系、碳化硅系、铝系、锫系等的精密陶瓷总称为“库罗舍拉姆”而库罗舍拉姆——N,是该公司开发的高温结构用陶瓷的氮化硅—碳化硅复合烧结体。 相似文献
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通过无压烧结制备了ZrO2-Si3N4复合陶瓷材料,并以排水法、SEM和DDL100型万能拉伸机进行表征。研究了ZrO2含量对Si3N4陶瓷的致密度、显微结构和力学性能的影响。结果表明,随着ZrO2含量的增加,Si3N4陶瓷致密度增加;抗弯强度和断裂韧性先增大后减小,当ZrO2含量达到10%时,Si3N4的抗弯强度和断裂韧性同时达到最大值,分别为362MPa和7.0MPa.m1/2。ZrO2增韧Si3N4陶瓷的机制为应力诱导相变。 相似文献
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Siliconnitrideceramichasaseriesofexcellentproperties,forexample,highstrength,highhardness,wear,corrosion,oxidationandshockresistanceetc.,andisakindofhightemperaturestructuralmaterialwithenormouspotentialitiesforfuturedevelopment.Buthighcostfor… 相似文献
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周飞 《中国稀土学报(英文版)》2001,(2)
Bondingofsiliconnitrideceramicswithoxideglasssolderhasbeenachievedverygreatsuccess[1~ 11] .Owingtothelowersofteningtemperatureofresidualglassinjoint ,thehightemperaturestrengthofjointhasbeendeterio rated .Inordertoimprovethejointstrengthatelevatedtemperatu… 相似文献
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以Cu基预合金粉为基体,加入SiC、Si_3N_4、B4C多元陶瓷作为颗粒增强相,利用粉末冶金法通过真空热压烧结工艺制备了SiC、Si_3N_4、B4C多元陶瓷/Cu基复合材料,并用激光脉冲法测试其室温条件下的导热性能。研究发现,随着SiC、Si_3N_4、B4C多元陶瓷含量的增加,复合材料的热导率逐渐减小,特别是当SiC、Si_3N_4、B4C多元陶瓷总质量分数大于15.0%以后,热导率急剧下降。复合材料内部的孔隙以及晶界、晶格畸变、位错等缺陷是影响热导率的主要因素。要获得导热性能良好的复合材料,应严格控制SiC、Si_3N_4、B4C多元陶瓷的质量分数在15.0%以内,并且可以考虑通过退火以及二次挤压等方法进一步提高致密度,减少烧结体内的位错、孔隙等缺陷,从而提高导热性能。 相似文献
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An experimental study was conducted to examine the effect of melt cleanliness with respect to the presence of inclusions on
the properties of an Al-10 wt pct Si metal matrix composite (MMC) reinforced with 10 vol pct SiC particles. The occurrence
of inclusions was controlled by filtra- tion, using ceramic foam filters of 10, 20, and 30 ppi sizes, under gravity and pressure.
Test bars obtained from filtered and unfiltered melt castings, prepared from fresh (as-received) and recycled composite materials,
were T6-tempered and tensile tested at room temperature. The casting quality was examined using X-ray radiography. The results
indicate that various factors influence the casting quality and mechanical properties of the cast composite. The A12O3 films and spinel MgAl2O4 — the main inclusions observed in the present composite — are chiefly responsible for the degradation in the mechanical properties.
In addition, SiC sedimentation, Al4C3 formation, the hydrogen level of the melt, and the starting material used can also influence these properties. Fracture studies
reveal that the inclusions and associated microvoids act as the crack initiation sites during composite fracture. Simple filtration
using 10 ppi ceramic foam filters under gravity serves adequately in removing these inclusions and producing the desired mechanical
properties. 相似文献
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陶瓷基体热喷涂涂层的研究进展 总被引:1,自引:0,他引:1
由于表面改性的需要,陶瓷基体对热喷涂涂层方案的需求也在日益增加.根据基体结构和性能的不同,需要开发特殊的基体相关的制备概念.本文展示一些在烧结氮化硅和AlN陶瓷上沉积涂层的概念.使用传统的喷砂工艺处理的基体近表面区域粗糙度低并会带来损害.作为替代方法,激光刻蚀被用来改变陶瓷基体的热喷涂表面特性.通过选择适当的激光刻蚀参数和喷涂方法,成功地制备了与陶瓷基体具有良好结合性能的大气等离子喷涂(APS)和悬浮液超音速火焰喷涂(suspension-HVOF A12O3)涂层. 相似文献
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Hot isostatic pressing (HIP) is applied for treatment of castings of innovative low-ally high-strength aluminum alloy, nikalin ATs6N0.5Zh based on the Al–Zn–Mg–Cu–Ni–Fe system. The influence of HIP on the structure and properties of castings is studied by means of three regimes of barometric treatment with different temperatures of isometric holding: t 1 = 505 ± 2°C, p 1 = 100 MPa, τ1 = 3 h (HIP1); t 2 = 525 ± 2°C, p 2 = 100 MPa, τ2 = 3 h (HIP2); and t 3 = 545 ± 2°C, p 3 = 100 MPa, τ3 = 3 h (HIP3). It is established that high-temperature HIP leads to actually complete elimination of porosity and additional improvement of the morphology of second phases. Improved structure after HIP provides improvement properties, especially of plasticity. In particular, after heat treatment according of regime HIP2 + T4 (T4 is natural aging), the alloy plasticity is improved by about two times in comparison with the initial state (from ~6 to 12%). While applying regime HIP3 + T6 (T6 is artificial aging for reaching the maximum strength), the plasticity has improved by more than three times in comparison with the initial state, as after treatment according to regimes HIP1 + T6 and HIP2 + T6 (from ~1.2 to ~5.0%), which are characterized by a lower HIP temperature. 相似文献