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石墨
烯了?
請教一個關於霍爾效應的問題
gzw_940322
13年7个月前
回复于
物理
内容:会呀,好像
石墨
的导电区域是一层一层排列的,好像在那一层的两端通过电流,就可以产生电压
轨道炮新想法
sunge_8999
12年11个月前
回复于
电磁炮
内容:直接用
石墨
做炮弹不行吗??
试制玻璃碳
charcoal_碳
2年6个月前
回复于
极客DIY
内容:还是催化
石墨
化吧
我觉得过年要玩水,于是晚上睡觉会着火....
火星居士
13年0个月前
回复于
机械与工具
内容:建议买个铁的或者是
石墨
坩埚吧。
对电解枪做个终结
ltc
13年11个月前
回复于
化学
内容:LZ用的什么电极,
石墨
?
关于石墨烯的疑问
ltl
13年8个月前
回复于
化学
内容:
石墨
层间作用力很小吧……
【缺货】复用型固体火箭发动机套件CRE-36A发售贴
陈
5年3个月前
回复于
会员海报
内容:呃呃呃,我想买个
石墨
衬喉的发动机一个卡簧钳,收货地址在这里发合适吗?
零件垫圈, 钨钢, 或者 石墨 制作的急需 !!!!
.........
11年8个月前
回复于
跳蚤市场
内容:
石墨
还有自润滑效果
总结电解制氯酸盐
smith
5年3个月前
回复于
化学
内容:这个结论是哪里来的,实际上MMO电极相比
石墨
电极有太多优势,损耗小,电流密度可以做到很高,
石墨
电极效果很差的,长时间后电解液即变得很浑浊,就算是过滤电解产物也有可穿透滤纸的
石墨
颗粒污染,目前MMO电极价格也并非贵得无法接受
《走近科学:碳纤维发动机》
七公里垃圾站职业技术学院
8年9个月前
回复于
喷气推进
内容:碳纤维和
石墨
其实一点都不优越碳纤维比不上现在仅能做出几纳米的碳纳米管碳纤维也就能够承受进千度高温,比不过耐高温钢的一千多度的温度,也就比铝合金高了点碳纤维抗拉强度也就比铝合金,高了几倍,实际上也是还有几种材料能够超过这种性能的碳纤维加工时,,钻孔也并不怎么好钻,还得用到钻头,而不能用手扣碳纤维性价比也就那么点,目前还没几种比他更高的,等出现免费的碳纳米管,碳纤维就该退役了
石墨
喷管也就那么回事,谈不上优越性能
石墨
材料也就能够在一般固体发动机的气体负氧环境下,,耐个几千度高温,比钢,铝合金高不了几千度楼主帖子中说的那个人用的
石墨
也比不上热解
石墨
石墨
太脆了,以至于他必须和别的材料一起用才能够秒杀其他好找到的材料综上所述,各个国家的火箭就像楼主描述的那样,瞎搞,
(定期更新)新发动机设计进展报告
浪里黑条
5年9个月前
回复于
喷气推进
内容:
石墨
一般是配合金属喷管当喉衬使用,其抗拉强度、剪切强度等指标甚至还不如PPR,而且还比较脆。,如果要固定
石墨
喷管,建议用水泥,比石膏强到不知道哪里去了。
铝空气电池制作教程
minlianw
10年4个月前
回复于
化学
内容:可以普通木碳加
石墨
粉混合填 充
高氯酸铵的制备
我实在
1年9个月前
回复于
化学
内容:电解制氯酸钠不能理解为先生成次氯酸钠然后歧化啊而且实际上如果用
石墨
电解氯酸钠溶液的话
石墨
电极的损耗是非常严重的,但作者您发的视频中电极似乎没有太大的腐蚀,这说明此时溶液中的主要成分还是氯化钠,建议将产物的溶液与氯化钾混合检验一下您是否制出来了高氯酸根
小型轨道炮计划
HXKRRRR
7年0个月前
回复于
电磁炮
内容:Climent:引用 HXKRRRR:引用 Climent:有钱的话开关可以使用可控硅(一块上千),没钱的话可以买一个直流接触器(类似继电器,但是额定电流大,一个几百块),如果还没钱的话可以自己DIY一个,做两个
石墨
铜接触块,-
石墨
合金轨道,但是这样的轨道可能价格较高,质地较脆,不太容易加工,而且好像还没有人试过,不知道具体效果如何,lz可以进行尝试emmm...可控硅用不了这么多钱吧,估计KP800A的浪涌电流就能支持了(,轨道严重同意楼上的观点😂铜或铝轨道烧蚀太惨了😂
石墨
还没有什么应用记录(而且关键是
石墨
的电阻率高达铝的2000倍)……楼主尝试一下也是好的。,-
石墨
合金,这种材料经常用于做直流电机的电刷,所以电导率、耐烧灼性能应该都不错,而且大不了就提电压嘛,反正不管左右效率都小的可怜😂发个截图。,铜
石墨
合金我也同意,但是会不会比较贵……关键是电机的电刷相对轨道而言很小很短,电流也相对很小,电导率影响应该不会这么大吧?
赠送喷管!
ksama
13年4个月前
回复于
跳蚤市场
内容:内径70
石墨
喷管飘过了 另这个设计不错
一种柔性防水碳芯电阻棉线缠绕机的制作
马加7
6个月11天前
回复于
机械与工具
内容:6MM线口不行太大了裹不住
石墨
粉,正常保险丝机12根线了线口内径在3-4MM
40mm外径丐版固体燃料发动机
沉默彩虹
3个月22天前
回复于
喷气推进
科创基金
内容:收敛段用3D打印可还行,收敛段温度比扩张段高,从你的模拟结果上也能看出来,至少应该收敛段
石墨
扩张段3D打印呀。
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
Stewart
4年10个月前
回复于
化学
内容:
石墨
粉穿滤么?
电学新手请教
HK007
18年2个月前
回复于
电磁炮
内容:以下是引用bomb在2006-12-08 18:20:14的发言: 我说的那个弹簧开关如果一个用
石墨
电极(1号电池中的碳棒),那么就可以解决粘连的问题了,或者用大电流的继电器.看怎样?,理论上可行,实际上不行,
石墨
电极的电阻比较大,特别是电池碳棒,以前测量貌似有零点几欧,这个电阻已经不能忽略,线圈的电阻也才零点几欧,这样会造成很大的能量损失,不过如果能找到纯度比较高的
石墨
电极就好了.
求教:关于切割方法((急急急)))
梁少博
9年6个月前
回复于
极客DIY
内容:
石墨
亚克力用锯,管子用水管剪
铝管发动机加上石墨喷嘴效果会怎么样那?
d185345878
14年2个月前
回复于
喷气推进
内容:
石墨
棒挖洞。。。
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