I think that MFMP is concerned about melting or exploding the core. On Sat, Jan 3, 2015 at 11:07 PM, CB Sites <[email protected]> wrote:
> I agree with you Bob. Getting a good seal will be the challenge of this > experiment. I've seen a few electron micrographs of hydrogen is Si and > other metals and it is amazing how deep H will migrate into a lattice. > Jones Benne points to the S-bond.com. It will take something more than > that to seal this structure at the high temps, high pressure and > embrittlement from hydrogen gas in this experiment. Knowing the pressure > and core temp is a noble cause, but until replication is done, do we know > enough about the phenomena to pursue those experiments? > > > On Sat, Jan 3, 2015 at 6:40 PM, Bob Cook <[email protected]> wrote: > >> Jones-- >> >> Unless the thermal expansion of the alumina body is matched to the >> expansion of the Stainless Steel sleeve, it will be very hard to maintain a >> seal. The thermal stresses will become very high at the interface of the >> two materials. I think that the pressure changes seen in the recent MFMP >> test were due to thermal expansion acoustic emissions upon each increase in >> temperature. This emission caused the pressure sensor to spike. A sonic >> acoustic emission monitor would be valuable to deduce where the strain is >> and its intensity as a function of heating, if good sealing of the >> connection is necessary. I am not sure the objectives of the test required >> such sealing and pressure containment. >> >> (Acoustic emission monitoring is an old technique to look for micro >> cracking in fission reactor equipment that happens during thermal >> transients. Its quite sensitive and has/had been resisted by reactor >> vessel manufacturers, because it was so good for identifying defects in >> their forgings that other wise might not be discovered.) >> >> Bob >> >> ----- Original Message ----- >> *From:* Jones Beene <[email protected]> >> *To:* [email protected] >> *Sent:* Saturday, January 03, 2015 1:49 PM >> *Subject:* [Vo]:Ceramic-to-metal hermetic bonding >> >> It is possible to bond alumina, such as a modified dogbone reactor >> directly to stainless tubing, using the proprietary S-bond alloy : >> >> >> >> http://www.s-bond.com/blog/2011/04/04/ceramic-metal-bonding-part-one/ >> >> >> >> The advantage would be allowing a permanent fill port for hydrogen, along >> with a pressure gauge, and other feed-thru accommodations which are more >> easily ported into metal then into ceramic. >> >> >> >> The design problem would be in keeping this metal part of the reactor >> cooler than the rest of the reactor – and the simple solution for that is >> to add a long ceramic extension tube to the dogbone, which extension is not >> powered and it can be as long as the reactor itself with a decreasing >> temperature gradient, then to add the stainless plumbing to the far end of >> the ceramic extension tube using S-bond. This keeps the heated segment >> spatially removed from the stainless. There would be a hot-end and a >> cold-end, and the entire unit would be much longer. >> >> >> >> For any dogbone device to move towards commercialization, far more >> control must be implemented, including fuel availability and pressure – and >> this means adding hydrogen from a tank at a controlled pressure. A ceramic >> to metal bond is one way to do that. >> >> >> >> I am assuming that hydrogen is the only consumable, at least until >> testing from Parkhomov shows otherwise. >> >> >> >> >> >> >> >> >
