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请教一个关于TC放电器的问题
dudemin
14年9个月前
发表于
高电压技术
内容:TC放电器,准备用干电池里的
石墨
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石墨
的耐高温性比其他的要好的多,导电性也好,计划用电机带金属放电棒,多点
石墨
棒放电的方式,电机轴上加个风扇叶子用来产生散热效果
【液机】【计算软件】用于辐射冷却液体火箭发动机/烧蚀冷却火箭发动机/固体火箭发动机隔热层的计算的软件
154454496
5年3个月前
回复于
喷气推进
软件综合
内容:其实
石墨
是一种不错的耐高温材料,在做好表面处理的情况下,承受2500摄氏度的高温应该不成问题,
石墨
液机应该能抛弃再生冷却了。
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power_rdx
4年7个月前
回复于
会员海报
喷气推进
内容:不锈钢的力学性能并不好但加工成本高,寿命上也并没有比之前的酚醛
石墨
喷口更长,建议更换为机加工酚醛树脂+更大面积的
石墨
噴喉
关于电解硫酸铜溶液的一个问题,求教!!!
1996615xp
11年2个月前
发表于
化学
内容: 最近做了电解硫酸铜试验,当我电解一段时间后,发现
石墨
电极下方沉积下来许多黑色物质,我估计是碳,一看
石墨
电极,果然变细,相信大家都做过这个实验,各位高手们,为什么碳棒会变细? ,我用的试剂:硫酸铜500g分析纯,
石墨
电极是从电池中拆下的碳芯、各种型号铅笔芯。
【液体火箭】250N小型液体火箭发动机制造试车记录
Na4TNAE_SSSIC
2年6个月前
回复于
喷气推进
航天技术
内容:
石墨
喷管型面图更正
铝空气电池制作教程
静观琪变
10年4个月前
回复于
化学
内容:暴走的小君哥 发表于 2014-8-31 00:29 直接用
石墨
粉可以么因为
石墨
粉没有木炭一样的微孔结构,所以在储氧方面不及木炭,但是
石墨
的电阻比木炭低,电池内阻小。,我觉得
石墨
粉是可以尝试的
自制超简单超有创意的铅笔
whgh
11年9个月前
回复于
极客DIY
内容:由于
石墨
能像铅一样在纸上留下痕迹,这痕迹比铅的痕迹要黑得多,因此,人们称
石墨
为“黑铅”。,因此,拿破仑·波拿巴发动了对邻国的战争后,英、德两国切断了对法国的铅笔供应,因此,拿破仑·波拿巴下令法国的化学家孔德在自己的国土上找到
石墨
矿,然后造出
石墨
铅笔。,1761年德国人F·卡斯特在纽伦堡市创建了法泊·卡斯特
石墨
铅笔厂,采用硫磺、锑等作粘结剂与
石墨
加热混合制造铅芯,使
石墨
铅笔制造技术前进了一大步。,1790~1793年,法国N·J·康德首次采用水洗
石墨
的办法,使
石墨
的纯度提高,并用粘土将
石墨
粘结制成笔芯,此法被称为康德法。,1793年建立康德
石墨
铅笔厂,为铅笔工业奠定了基础。
出一道物理题
refinder
6年1个月前
发表于
物理
内容:
石墨
烯的厚度为0.33 nm,如果用
石墨
烯制作电极,中间间隔0.5nm介质,介质为金刚石(相对介电常数8),那么一个1m×1m×0.05m的空间内,最大可以实现的电容量是?
热解石墨磁悬浮
chenluois
10年8个月前
回复于
极客DIY
内容:metellan 发表于 2014-5-6 13:53 据说普通
石墨
片或棒也可以。,普通
石墨
抗磁性较弱,悬浮的比较低。,热解
石墨
悬浮高度有 1~2mm,普通
石墨
能达到 0.2mm 就不错了。
中国浙江大学制造出世界最轻材料:超轻气凝胶
玄明
11年10个月前
回复于
机械与工具
内容:首先注意这句话:“高超的课题组经过五六年的探索,制备出了一维的
石墨
烯纤维和二维的
石墨
烯薄膜。,这次,他们打算把
石墨
烯做成三维多孔材料来冲击这一纪录。”,在这里我想我们必须要先了解一下所谓的
石墨
烯薄膜是神马玩意儿,
石墨
烯是一种很坚硬的薄膜,强度是钢铁的上百倍。,所谓的
石墨
纤维其实和前些年被炒得很热闹的碳纳米管其实是一种东西,这两样的一个最显著缺点就是结实,非常的结实……所以,现在一个另人尴尬的情况就出现了:在实验室中碳纳米管和
石墨
烯薄膜的制备都是比较成熟的技术,关于
石墨
烯的资料可移步这里:比钢铁坚硬上百倍的新材料?
感应加热石墨怎么没有反应哦,感应线圈都烧红了?
metellan
10年0个月前
回复于
高电压技术
内容:引用 xiaotian99:好象不关电阻的事哦,铁,铝的电阻都很小,
石墨
也是啊。,但是通常铁很容易被感应加热,是因为铁有磁性,而铝和
石墨
没有。,铜1.7×10^-8 铁1.0×10^-7 铝2.9×10^-8
石墨
(8~13)×10^-6
石墨
的电阻率是铁的100倍,铜的500倍以上。,如果你想用涡流加热
石墨
,玩命提升频率吧。
【液机】【计算软件】用于辐射冷却液体火箭发动机/烧蚀冷却火箭发动机/固体火箭发动机隔热层的计算的软件
荷城工业_Nitload_Industry
2年5个月前
回复于
喷气推进
软件综合
内容:其一,
石墨
抗冲击性能极差,在工作过程中极易破碎其二,对于含碳推进剂(如乙醇)燃烧产生高温二氧化碳,会与表层
石墨
反应生成一氧化碳,腐蚀推力室内壁
請教一個關於霍爾效應的問題
yulijia1222
12年5个月前
回复于
物理
内容:
石墨
晶体既不是单晶,也不是多晶,其导电主要存在在层状面(层状面原子以sp2杂化共价形式结合,属于原子晶体,sp2杂化后,每个碳原子还各剩下一个p轨道,它们相互重叠,存在自由电子),
石墨
层层间通过范德华力结合,故
石墨
的导电性能具有各项异性。,考虑到霍尔效应对导体具有一定的厚度要求,理论上考虑,
石墨
只有一个方向上存在霍尔效应,但这只是经典层面上的预估,具体霍尔效应情况,建议考虑量子效应后才能计算。
燃料电池系列之一——再生式燃料电池的制作
火星居士
10年10个月前
回复于
化学
内容:13721225643 发表于 2014-2-17 23:16 建议楼主将
石墨
棒换成
石墨
片(淘宝有售),增大反应面积。,还有楼主,原理图中氢氧化钾应该和氢气氧气隔离吧, ...
石墨
片的话无法卷曲折叠,我正在考虑换
石墨
纸,不过我个人倾向于换粗镍丝,能跟我的反应容器隔离。
氯酸钠的合成(上):无隔膜电解氯化钠溶液制备次氯酸钠溶液
已注销用户
4年10个月前
回复于
化学
内容:这个颜色很明显是混入了
石墨
粉,这种
石墨
棒在电解时会逐渐剥离,极细的
石墨
粉会悬浮在溶液里。
手工制作石墨喷管指南
法式油炸薯条
9年8个月前
回复于
喷气推进
内容:引用 mark42:高强
石墨
喷管看起来有点粗糙,应该要用高温裂解
石墨
然而好的热解
石墨
价格堪比黄金,耐烧蚀也不见得比普通
石墨
高多少
有一个石墨材料
mingleigh
8年9个月前
回复于
喷气推进
内容:这个
石墨
是不透
石墨
,浸渍了酚醛树脂或其他树脂,化工用的。,两限
石墨
一般指的是大块等静压高密度
石墨
,纯度也高。,跟楼主的
石墨
有些区别。
【电力电子】让我们畅谈电力电子爱好的发展
shsyfsh
9年1个月前
回复于
电气电工
内容:中国制造的能力——高科技卖成“白菜价”垄断毁灭者——中国人轮胎、防弹装备、润滑油等,都需要
石墨
烯。,以前,
石墨
烯是高端材料,国际市场上5000元一克,2013年,宁波建成了年生产能力300万吨的生产线,
石墨
烯成本价格降为3元一克。
[风行动]申请经费用于完成金属火箭的制作与发射
Erter
11年6个月前
回复于
科创基金
内容:下面补贴发动机的一些细节发动机燃烧室总长:400mm药柱:80mm*5 燃料:RNX发动机燃烧室材料:45号钢喷口共有三款:分别是6mm热解
石墨
8mm热解
石墨
6mm40Cr喷口收缩段:15°扩张段:45
有一个石墨材料
longgexu
8年9个月前
回复于
喷气推进
内容:引用 mingleigh:这个
石墨
是不透
石墨
,浸渍了酚醛树脂或其他树脂,化工用的。,两限
石墨
一般指的是大块等静压高密度
石墨
,纯度也高。,跟楼主的
石墨
有些区别。
手工制作石墨喷管指南
FROZEN巨擘
9年8个月前
回复于
喷气推进
内容:引用 法式油炸薯条:耐冲刷靠的是强度,
石墨
强度已经够了。,高强
石墨
根铅笔里的
石墨
差别非常的大 铅笔,是粘土和
石墨
吧,而且粘土含量越高,硬度越大...
大北
uid: 87414
实习会员
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注册时间:2020/5/27 12:59:50
最后活动:
4年3个月前
碳纳米管,
石墨
烯等的mpcvd设备部研发。
有没有简单方法将氯酸钾转化为高氯酸钾
ne555
12年3个月前
回复于
化学
内容:干电池里面的
石墨
棒做
石墨
电极行吗
自己做的kn-pu-mg火箭
法式油炸薯条
10年0个月前
回复于
喷气推进
内容:引用 口贝:
石墨
?,怎么做的 锯一截
石墨
棒,用电钻钻孔,然后用剪刀扩孔。,
石墨
很软,很好加工
向坛子里懂电化学测试的大神求救
blueness
9年10个月前
回复于
仪器仪表
内容:
石墨
电极也可以,惰性,不过
石墨
电极容易有颗粒脱落,需要预处理。
一个制取硫酸的方法
Johnny-Wei
5年10个月前
回复于
化学
内容:其实并不贵,100元的铂丝就能弄个小电极,好处是几乎零损耗,算下来比
石墨
的还便宜,
石墨
电极其实不便宜的,如果用铅笔芯或者干电池的粘结
石墨
棒,电极消耗非常大,过滤麻烦,消耗滤材,光电费都比用铂丝高。
电解氯化钠制备SP
大宇宙时代
4年8个月前
回复于
化学
内容:不是
石墨
电极不耐腐蚀,是因为你从电池里取出来的不纯,这种碳棒,是粘土与
石墨
混烧制的里面有硅铝酸盐,极纯的
石墨
电极是极耐电腐蚀的,
中学生在中科院搞事情之——石墨烯的制备
浪里黑条
6年8个月前
回复于
化学
内容:称取52.6g浓度为1.9mg/g的氧化
石墨
烯分散液。,将硫代硫酸钠溶液与氧化
石墨
烯分散液混合,随后缓慢加入盐酸。,期间继续洗涤剩余的氧化
石墨
烯。
150N气氧煤油发动机辐射冷却可行性验证
LTs60361
4年9个月前
回复于
喷气推进
科创基金
内容:話說我的
石墨
下訂後直接無聲無息...
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