Reference

Heat protective material

Heat protective material. Marion, Frank A.; McSpadden, Hugh J. (Universal Propulsion Co., USA). U.S. US 4001126 4 Jan 1977, 16 pp. (English). (United States of America). CODEN: USXXAM. CLASS: IC: C04B043-00. NCL: 252062000. APPLICATION: US 68-766066 15 Nov 1968. DOCUMENT TYPE: Patent CA Section: 57 (Ceramics) Section cross-reference(s): 55 A thermal insulator was prepd. for use at high temps. for extended times (i.e. for a rocket nose cone). The thermal insulator, which forms a char at high temps., contains fillers which decomp. in successive steps as the temp. increases. The gaseous products flow through the char and provide a gaseous barrier to absorb and transport heat from the surface. For example, a mixt. of polysulfide (thiokol LP-33) binder 55, curative (DMP-30) 4.5, NH4HB4O7.cntdot.3H2O [12007-57-7] filler 47, epoxide (Araldite 6020 [25068-38-6]) binder 45, and NaH2PO4 [7558-80-7] filler 34.4 wt. parts was bonded to a 4130 steel sheet to thickness 0.05 in. This sheet was heated to .apprx.3000.degree.F by an oxyacetylene torch and, after 60 min, the temp. on the back of the sheet was 231.degree. vs. 600.degree. for an asbestos-coated steel sheet after 10 min.

Inhibition of stress-corrosion cracking of steel pipeline

Inhibition of stress-corrosion cracking of steel pipeline. Fessler, Raymond R.; Berry, Warren E.; Wenk, Russell L.; Parkins, Redvers N.Several substances are used for example 6484-52-2 and 7758-29-4 which are their cas registry numbers. (American Gas Association, USA). U.S. US 3973056 3 Aug 1976, 15 pp. (English). (United States of America). CODEN: USXXAM. CLASS: IC: F16L058-04. NCL: 427136000. APPLICATION: US 74-477169 6 Jun 1974. DOCUMENT TYPE: Patent CA Section: 55 (Ferrous Metals and Alloys) The inhibition of stress-corrosion cracking of pressurized X-52 [39362-66-8] steel pipelines for gas transmission is accomplished by use of 0.1-1% Ca(H2PO4)2 [7758-23-8], NaH2PO4 [7558-80-7], Na5P3O10 [7758-29-4], or aq. K silicate [1312-76-1] (K2O 9, SiO2 20, H2O 71%). Concns. of 0.01-1% were tested in solns. contg. 33% NaOH, 20% NH4NO3, and N NaCO3 + N NaHCO3. Range in NaOH and Na2CO3-NaHCO3 solns. and at -175 mV (Cu-CuSO4) in a NH4NO3 soln. These solns. were chosen because field and lab. tests have shown that stress-corrosion cracking of buried pipelines is caused .gtoreq.1 of these chem. in the environment. Liqs. contg. CO3, HCO3, OH, Cl, and/or NO3 ions were found under coatings near stress corrosion cracks in pipelines buried in 4 different states of the US. In general, the best results were obtained with 1% Ca(H2PO4)2.H2O and Na5P3O10 solns. Inhibiting compns. for coating pipelines were prepd. by blending 20% of each of the inhibitors with a coal tar primer, but the K silicate compn. formed a gel that did not harden. Teaching times and failure times were detd. for each compn. Other methods of application involve incorporation into asphalt and epoxy resins. In coal tar and these media, baking would be required, hence coated specimens were baked at 500.degree.F for 1 hr. The results indicated that Na5P3O10 was least likely to be affected by baking. .