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约找到 16 条结果,耗时 0.189 秒
150N气氧煤油发动机辐射冷却可行性验证
154454496
4年9个月前
发表于
喷气推进
科创基金
关键词:
热导率
[贴图]我的“触角”实验室
twz562
16年10个月前
回复于
化学
内容:模型火箭发动机喷管用的是碳化硅+耐火粘土+水玻璃,强度很高,耐火度很强,抗热冲击性也相当的好,唯一的缺点是
热导率
太高。,估计可以用低
热导率
的内衬(锆刚玉)解决掉。
【液机材料】铌合金的一些资料
博丽灵梦
10年6个月前
回复于
喷气推进
内容:Cu的
热导率
达到了397W/(m·K),C-103只有37.67W/(m·K),所以说不能用于再生冷却
研究一下可以用鈦製造发动机嗎?
3AD156
16年10个月前
回复于
喷气推进
内容:
热导率
2.43×107W/m·K(20℃),热膨胀系数7.74×10-6/℃
Weller烙铁头烧死粘连,强行取下方法
twz562
3年9个月前
回复于
电子技术
内容:话说,换烙铁头前,先涂抹一层导热硅脂,或者石墨,二氧化钼之类的物质,以后取的时候会不会容易点,而且也能提高导
热导率
。
全球首款多单元结构金刚石基GaN HEMT发布
流落到四川
5年3个月前
发表于
晶体养成所
内容:关键特性(1)全球首款金刚石衬底直接键合的多单元结构GaN-HEMT为了得到有效
热导率
更高的金刚石基GaN HEMT器件,目前主要采用三种方式实现金刚石衬底与GaN外延材料的结合。,由于该技术早期的键合实验一般在800℃高温下进行,极大限制了生长区域,且需要引入低
热导率
的界面键合材料,从而导致器件性能优势无法充分发挥。,(2)相比硅衬底上具有相同结构的GaN-HEMT,改善了输出和功率效率,以扩展无线电波范围,并且更节能采用单晶金刚石(
热导率
为1900 W/mK)衬底以获得卓越的散热性能可降低热阻值,从而将GaN-HEMT
150N石墨燃烧室气态氧-柴油辐射冷却火箭发动机的研制工作
154454496
4年10个月前
发表于
喷气推进
科创基金
内容:二、研究目标设计制造一台设计推力150N的石墨燃烧室的辐射冷却发动机并进行地面试车,测量其推力数据,结合仿真数据研究下列内容:测试石墨用于辐射冷却液机燃烧室的可行性;估算石墨
热导率
、比热容与温度关系;验证齿轮泵用于烃类燃料供给的可行性,根据相关资料,石墨可以承受的温度在2000K以上,且其
热导率
随温度升高而降低。,5-8 数据整理:由以上试车所得数据计算石墨温度-
热导率
关系,比冲-混合比关系等参数。
关于钛合金和铝合金制作发动机外壳的观点(固)
小葱碎片
9个月19天前
发表于
喷气推进
动手实践: 社会实践,严肃内容: 专业科普
内容:克每立方厘米发动机的用途1:燃料稳定性测试 2:搭载火箭升空根据用途可以得知,发动机的要求是在保证强度的同时,又需要保证轻,而且如果搭载在探空火箭内,又需考虑到
热导率
,,如果
热导率
过高,可能会导致损伤一些3d打印零件和电子元件。,合金型号
热导率
钛合金Ta26.86瓦每米每开钛合金Tc47.955瓦每米每开钛合金Gr115.24瓦每米每开铝合金6063166瓦每米每开铝合金6061t5155瓦每米每开铝合金7075t5173瓦每米每开铝合金
纳米金刚石,从工业到生物科技的“刚”化之路
流落到四川
5年3个月前
发表于
晶体养成所
内容:纳米金刚石早在三十多年前就已被研制出来,这种粒径在1~100nm的金刚石晶粒存在形态,兼有金刚石、纳米材料的特性,例如高硬度、高耐腐蚀性、高
热导率
、低摩擦系数、低表面粗糙度、大的比表面积、生物相容性、高的表面活性等,由于纳米金刚石兼具纳米粒子和超硬材料的双重特性,可将其用来制造增强橡胶、增强树脂,该应用在提高材料
热导率
,聚合物降解温度、强度和耐磨性等方面作用明显,使纳米金刚石在新型复合材料领域具有广阔的开发前景。
细数国外金刚石半导体材料和器件发展情况
流落到四川
5年3个月前
发表于
晶体养成所
内容:这类半导体材料具有更高的禁带宽度、
热导率
以及材料稳定性,在新一代深紫外光电器件、高压大功率电子器件等领域具有显著的优势和巨大的发展潜力,目前正成为国际竞争的新热点。,金刚石作为超宽带隙半导体材料的一员(禁带宽度5.5 e V),具有优异的物理和化学性质,如高载流子迁移率、高
热导率
、高击穿电场、高载流子饱和速率和低介电常数等,以下是相关参数对比。,由于金刚石具有很高的
热导率
和极高的电荷迁移率,其制成的半导体器件能够应用于高频、高功率、高电压等恶劣环境中,具有巨大的应用前景。
气凝胶
子羽
16年6个月前
发表于
化学
内容:它们明显不同于孔洞结构在微米和毫米量级的多孔材料,其纤细的纳米结构使得材料的
热导率
极低,具有极大的比表面积.对光、声的散射均比传统的多孔性材料小得多,这些独特的性质不仅使得该材料在基础研究中引起人们兴趣,在作为隔热材料方面,硅气凝胶纤细的纳米网络结构有效地限制了局域热激发的传播,其固态
热导率
比相应的玻璃态材料低2—3个数量级。,通过掺杂的手段,可进一步降低硅气凝胶的辐射热传导,常温常压下掺碳气凝胶的
热导率
可低达0.013w/m·K,是目前
热导率
最低的固态材料,可望替代聚氨脂泡沫成为新型冰箱隔热材料。,掺人二氧化钛可使硅气凝胶成为新型高温隔热材料,800K时的
热导率
仅为6.03w/m·K,作为军品配套新材料将得到进一步发展。
关于火箭壳体材料的研究
ksama
13年6个月前
回复于
喷气推进
内容:热性能良好 FRP
热导率
低,室温下为1.25~1.67kJ/(m·h·K),只有金属的1/100~1/1000,是优良的绝热材料。
有奖金。求各位大侠推荐一种材料
龙之舞
10年10个月前
回复于
极客DIY
内容:性能参数 力学性能: 强度:3.6 GPa 伸长模量:131 GPa 断裂伸长率:2.8 % 热学性能: 长期使用温度:180℃ 轴向热胀系数:-2 × 10 ^ (-6) / K
热导率
CVD金刚石的市场前景及应用
流落到四川
5年3个月前
发表于
晶体养成所
内容:结合CVD金刚石光学,热学和力学性能,大大增强了CO2激光器的性能,使其功率达到最高水平,高的
热导率
几乎不会引起热透镜的光束质量的损失,也延长了光学器件的寿命,在高功率工业CO2激光窗口有非常好的应用前景
层流原理与热式原理气体质量流量计/控制器性能及应用对比(二)
小德喵喵
2年10个月前
发表于
仪器仪表
内容:其中 为被测气体的
热导率
; 为气体的定压比热容; 为气体的动力粘度; 为气体密度; 为气体流速; 为金属探头直径。
新型半导体制冷真空冰箱的研究 转
xihuanak
11年4个月前
发表于
极客DIY
内容:冷冻) = 0.023 kW2.2.4通过箱体传入冷负荷Q4 Q4 = KSp(TH-T4)式中Sp为箱体外表面积的平均值(m2);TH为环境温度(oC);T4为箱体内温度(oC);K为
热导率
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