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发表于
机械与工具
内容:发现至今得到了巨大的发展和现代企业的认可,但随着近几年研究的不断深入,人们发现Salomon的高速试验曲线在大部分材料的切削过程中根本无法获得,高速加工应用成功的领域也仅仅局限于铝合金、HRC60以上的预淬钢、
石墨
电极等几种材料的切削加工
小型轨道炮计划
iSee
7年0个月前
回复于
电磁炮
内容:没人在说你的方案有技术上的问题啊,要是我做的话,至少是复合导轨(外铝+内铜或
石墨
)、分段模式、kv以上高压、压缩气体驱动的注入方式、特制的弹丸等,这应该是我起步的最低标准。
世界首个采用电力驱动燃料泵的运载火箭“电子号”首次商业发射成功
太空来电
6年1个月前
发表于
喷气推进
内容:采用碳纤维复合材料的整流罩总重只有30kg,相比于采用
石墨
复合材料、质量194kg的米诺陶火箭标准型整流罩,减重高达80%以上。
揭秘最小收音机:仅1根纳米管可嵌入细胞(图)【转载】
wink101495
15年9个月前
发表于
极客DIY
内容:1991 年,饭岛教授宣布,他在发出电弧(即放电所形成的明亮弧状闪光)的
石墨
电极顶端发现了一些“针状碳管”。
基础化学常用英语词汇380条
thallium2012
14年4个月前
发表于
化学
内容:Graphite, Carbon Monoxide, Carbon Dioxide
石墨
,一氧化碳,二氧化碳138.
电解法制盐酸及硝酸蒸馏残渣的再利用
赵冥毅
1年3个月前
发表于
化学
内容:我用5×10cm钌铱钛电极代替了
石墨
阳极,用定制的钛网(网面为直径9cm的钛网,柄与网面对接焊)代替了铁丝网阴极,用直径9cm厚4mm的定制石棉隔膜代替了5mm厚的石棉保温材料,用瓶身外径9cm,瓶口直径
[分享]电子线路与电磁兼容设计
mass_lynnxy
18年7个月前
发表于
电子技术
内容:对信号引线还可以采取双地线并行屏蔽的方法,让信号线夹在两条平行地线的中间,这相当于双回路,干扰信号也会互相抵消,屏蔽效果非常显著;机器或敏感器件采用金属外壳是最好的屏蔽电磁干扰方法,但非金属外壳也可以喷涂导电材料(如
石墨
,由此可知“冷地”带电的电压正好等于输出电压的一半,如电视机显像管的高压阳极需要大约3万伏的高压,真正的零电位是在高压滤波电容(显像管
石墨
层之间的电容)的中间,或高压包的中间抽头处,由此可以求出电视机中的冷地与地之间的电压
从锁模到CPA放大——飞秒光纤激光器原理
科创喵
5年1个月前
发表于
强激光
内容:Keller发明半导体和饱和吸收体锁模,到后面光纤激光器中的NPR锁模,NOLM锁模到新型材料如
石墨
烯(Graphene)、二硫化钼(MoS2)和黑磷(Black phosphorus)锁模,已经建立起完备的锁模理论
火箭基础知识手册【包含板块索引】(新手必读)
leeqingyang
13年0个月前
回复于
喷气推进
内容:一般需要6个3-4MM螺母,用长螺丝串起来.农机胶要涂多些,这样才能充满螺母与纸管的间隙 卷好喷管后,将螺丝拧出 办法还有,比如电池里面的
石墨
条,可以钻孔后尝试制作芯管.其它一切合适的材料,只要发挥你的创意的思考
手把手教会你设计一个金属可复用固体火箭发动机
关山口国服坤坤
3个月7天前
发表于
喷气推进
动手实践: 实验报导,严肃内容: 教程/课程
内容:那么你设计密封圈槽深度的时候可以设计成1.89mm,这样让密封圈凸出来一点至于喷管材质这个问题我得说一下,AP的燃温比kn高,所以我建议AP发动机如果不上箭的话可以使用45钢,如果要上箭的话可以使用电木、
石墨
中国(GB)钢铁牌号表示方法简介
LED
18年11个月前
发表于
机械与工具
严肃内容: 专业科普
内容:轴承钢细分类与统一数字代号 统一数字代号 轴承钢细分类 B0××××× 高碳铬轴承钢 B1××××× 渗碳轴承钢 B2××××× 高温、不锈轴承钢 B3××××× 无磁轴承钢 B4×××××
石墨
轴承钢
生命是什么?E.薛定谔
thallium2012
14年9个月前
回复于
生物学
内容:在“无定形的”木炭纤维里,X射线已经揭示出
石墨
晶体的基本结构。
化学键归类,有助于揭示化学变化的电子偏移原理
白先森
11年10个月前
发表于
化学
内容:例如,碳单质有三类同素异形体:依靠C—C非极性键可以形成正四面体骨架型金刚石(原子晶体)、层型
石墨
(混合型晶体),也可以形成球型碳分子富勒烯C60(分子晶体)。
超声波对硫酸铜结晶的影响
ne555
10年4个月前
发表于
化学
内容:(2) 二向延展:晶体沿平面延展,呈板状、片状、鳞片状等,如黑钨矿、云母和
石墨
等常具此习性。
【水】【原创】简单的分析一下业余火箭发动机的技术路线
154454496
5年7个月前
发表于
喷气推进
内容:下面会分析几类常见的材料:PVC,PPR,酚醛树脂,45#钢,201,304,6061铝,6063铝,7075铝,紫铜,
石墨
,水泥,环氧树脂,分析的内容包括强度、比强度、熔点与软化温度、用途、用它制成一台内径,
石墨
------大于3500--喷喉等需要耐高温的地方水泥可购得62.5的硅酸盐水泥3左右20.81300左右失效1503土法火箭发动机外壳,塑料机的喷管堵头,发射架环氧树脂自适应喷管,堵漏,自制复合材料酚醛树脂喷喉
【研究性学习报告】交流电及城市供电(第一版)
廖
4年10个月前
发表于
物理
内容:通过用各种金属进行实验,意大利帕维亚大学教授伏打证明了锌,铅,锡,铁,铜,银,金,
石墨
是个金属电压系列,当这个系列中的两种金属相互接触时,系列中排在前面的金属带正电,排在后面的金属带负电。
[原创] 电池漫谈
TBsoft
7年11个月前
发表于
化学
内容:但实际上,普通干电池中的碳棒是惰性电极,并没有参与电极反应,普通干电池的结构是碳棒外面包裹着二氧化锰和碳粉(
石墨
粉和乙炔黑)的混合物,形成一个“电芯”,然后将其插入锌筒中,“电芯”和锌筒之间是以氯化铵为主要成分的电解液
第五节 新材料技术
大仙
16年5个月前
回复于
科学技术学
内容:它是将碳纤维物质经过特殊工艺使之多次碳化和
石墨
化后,作为增强体制成的复合材料。,硒、碲、硅、锗、磷等元素在超高压的条件下都可以表现出一定的超导性;超高压也是人工合成新材料的良好条件,将
石墨
放入5万个大气压的环境中,它的内部结构就会发生变化,形成性质绝然不同的"硬度之王"金刚石。
会攒机不叫DIY 最强电容讲座·实战篇
mass_lynnxy
19年1个月前
发表于
电子技术
内容:最后要将银粉和
石墨
涂在二氧化锰的表面上,减少它的ESR,增强它的导电性。
淘宝一家网店的试剂仪器价目表
消失
16年4个月前
发表于
跳蚤市场
内容: 瓶 26米吐尔 100g 瓶 90升华硫 500g 瓶 13.6钠石灰 500g 瓶 15保险粉 500g 瓶 20
石墨
粉
【RNX】【星孔】【真空仓】【航电】【3D打印】记一个未完成的探空火箭项目
Ma3.02的守望
6年3个月前
发表于
喷气推进
内容:这种材料真实性能不一定不能用于喷管一些设想:·航天用复合材料喷管制造工艺过于复杂,若能寻找一种类似于RNX、APCP的材料配方,用制造这些药柱的类似工艺制造喷管(混料-药泥-入模-固化),或许可替代金属喷管·在此方案中喷喉处加入
石墨
环以防扩孔
一些物质的介电常数
悲剧阿三
14年3个月前
发表于
电子技术
内容:4.0GLYCERYL TRIOCETATE 21 6GLYCOL 乙二醇25 37GLYCOL 乙二醇50 35.6GLYCOLIC NITRILE 乙二腈20 27GRAIN 谷物3/8GRAPHITE
石墨
超级长帖:化学化工词汇英汉对照表
虎哥
16年6个月前
发表于
化学
内容:ammophos 安福粉amobarbital 戊巴比妥amodiaquine 阿莫待喹amorphism 无定形amorphous carbon 无定形碳amorphous graphite 无定型
石墨
第六节 新能源技术
大仙
16年5个月前
回复于
科学技术学
内容:其侵化剂采用对中子慢化性能优良的
石墨
,冷却剂采用传导效率良好的氦气。,由于
石墨
耐高温,氦气化学性能稳定,所以反应堆出口的温度可高达1000℃以上,能保证供应950℃以上的工艺用热。
伦琴射线发生器资料贴
虎哥
13年8个月前
回复于
核技术与核仪器
内容:(见图为康普顿在X射线光谱仪前工作) 1923年5月,康普顿用爱因斯坦的光子概念成功地解释了x 射线通过
石墨
时所发生的散射。
核动力推进
AnthraX
16年0个月前
发表于
喷气推进
内容:上图的四个图柱(由左到右)分别代表碳纳米管,
石墨
纤维,芳香尼龙纤维B和不锈钢。
模型火箭基础知识
核武专家
16年1个月前
发表于
喷气推进
内容:对於长燃烧时间的固态火箭喷嘴而言 ,它的材料是最大的学问所在, 却系统,故必须使用数种不同的材料在喷嘴不同的部位来达到最佳化, 许多大型火箭的喷嘴喉部是以
石墨
製成。
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