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c*n
2
一个世纪前就出来了
from wiki
While the exact mechanism that causes wringing is unknown,[5][6] it is
believed to be a combination of:[4][5]
Air pressure applies pressure between the blocks because the air is
squeezed out of the joint.
Surface tension from oil and water vapor that is present between the
blocks.
Molecular attraction occurs when two very flat surfaces are brought into
contact. This force causes gauge blocks to adhere even without surface
lubricants, and in a vacuum.
It is believed that the last two sources are the most significant.[4]
There is no magnetism involved, although to a user the clinging together of
the blocks feels a bit like weak refrigerator magnets sticking together.
Unlike magnets, however, the cling only lasts while the blocks are
completely joined—the blocks do not attract each other across any visible
gap, as magnets would.
avatar
H*g
3

into

【在 c******n 的大作中提到】
: 一个世纪前就出来了
: from wiki
: While the exact mechanism that causes wringing is unknown,[5][6] it is
: believed to be a combination of:[4][5]
: Air pressure applies pressure between the blocks because the air is
: squeezed out of the joint.
: Surface tension from oil and water vapor that is present between the
: blocks.
: Molecular attraction occurs when two very flat surfaces are brought into
: contact. This force causes gauge blocks to adhere even without surface

avatar
H*g
4
牛叉。
我以前倒是一直想过,如果一块材料非常干净地断裂,为啥把它们很精确地对齐,不会
让他们长回去?估计是因为在断裂的地方都变形了(不然也不会断)。
avatar
I*d
5
两块表面平整干净的铅块压紧就结合在一起,说明分子间存在着______;
https://en.wikipedia.org/wiki/Cold_welding

【在 H********g 的大作中提到】
: 牛叉。
: 我以前倒是一直想过,如果一块材料非常干净地断裂,为啥把它们很精确地对齐,不会
: 让他们长回去?估计是因为在断裂的地方都变形了(不然也不会断)。

avatar
H*g
6
一张胶带轻轻一碰就粘在桌面上,说明分子间存在着______;
冷焊这个例子不错。不过如果能用激光(或者电子显微镜)把一个金属表面烧得绝对平
整,然后把另一块同样处理的金属往上一碰就变成一整块金属,那就更厉害了。如果这
个可以实现的话,岂不是最理想的焊接么?

【在 I********d 的大作中提到】
: 两块表面平整干净的铅块压紧就结合在一起,说明分子间存在着______;
: https://en.wikipedia.org/wiki/Cold_welding

avatar
I*d
7
https://en.wikipedia.org/wiki/Optical_contact_bonding
this link is in the "see also" section of previous link
"the intermolecular forces draw the bodies into the lowest energy
conformation, and no pressure needs to be applied"

【在 H********g 的大作中提到】
: 一张胶带轻轻一碰就粘在桌面上,说明分子间存在着______;
: 冷焊这个例子不错。不过如果能用激光(或者电子显微镜)把一个金属表面烧得绝对平
: 整,然后把另一块同样处理的金属往上一碰就变成一整块金属,那就更厉害了。如果这
: 个可以实现的话,岂不是最理想的焊接么?

avatar
H*g
10
把两块打磨出解理面的单晶硅放一块,能直接粘起来么?不过硅好像是原子晶体,晶格
里还需要建立共价键。如果两块极其理想的氯化钠晶体放一块估计可以直接变成一块。

【在 I********d 的大作中提到】
: https://en.wikipedia.org/wiki/Wringing_(gauge_blocks)#Wringing
avatar
H*g
11
当然要在真空里放一块。不然得等无限长的时间等空气从间隙里跑掉。

【在 H********g 的大作中提到】
: 把两块打磨出解理面的单晶硅放一块,能直接粘起来么?不过硅好像是原子晶体,晶格
: 里还需要建立共价键。如果两块极其理想的氯化钠晶体放一块估计可以直接变成一块。

avatar
H*g
12
如果可以长出来理想的金属单晶,并且能够切出一个解理面,是不是可以在真空里把它
们结合起来,并且达到近乎理想的机械强度?拿这个方法去造复杂部件岂不是非常好?
avatar
H*g
13
所以,空气夹杂在表面之间,对地球上的物体不乱粘来粘去非常重要。
It was then discovered that two clean, flat surfaces of similar metal would
strongly adhere if brought into contact under vacuum.

【在 I********d 的大作中提到】
: 两块表面平整干净的铅块压紧就结合在一起,说明分子间存在着______;
: https://en.wikipedia.org/wiki/Cold_welding

avatar
c*n
14
多谢
我老警察居然视频也没放好。。。

【在 H********g 的大作中提到】
: 所以,空气夹杂在表面之间,对地球上的物体不乱粘来粘去非常重要。
: It was then discovered that two clean, flat surfaces of similar metal would
: strongly adhere if brought into contact under vacuum.

avatar
H*g
15
器大伤身

【在 c******n 的大作中提到】
: 多谢
: 我老警察居然视频也没放好。。。

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