摘要:
The invention relates to new amorphous, high-strength SiBN(C) fibers which are at the same time resistant to high-temperature creep, their production and use. The fibers have a strength at room temperature of >2.5 GPa, a modulus of elasticity of >250 GPa and a creep value m of from 0.4 to 1 (in accordance with standard BSR test, 1 hour, 1400.degree. C.).
摘要:
The invention relates to new amorphous, high-strength SiBN(C) fibers which are at the same time resistant to high-temperature creep, their production and use. The fibers have a strength at room temperature of >2.5 GPa, a modulus of elasticity of >250 GPa and a creep value m of from 0.4 to 1 (in accordance with standard BSR test, 1 hour, 1400.degree. C.).
摘要:
The invention relates to new amorphous, high-strength SiBN(C) fibres which are at the same time resistant to high-temperature creep, their production and use.The fibres have a strength at room temperature of >2.5 GPa, a modulus of elasticity of >250 GPa and a creep value m of from 0.4 to 1 (in accordance with standard BSR test, 1 hour, 1400.degree. C.).
摘要:
The present invention relates to new trichlorosilylamino-alanes, new aluminosilazane compounds, new oligo or polyaluminosilazane compounds having the structural feature .tbd.Si--NH--Al, a silicon-aluminium nitride ceramic powder, ceramic material based on SiN and AlN, processes for the preparation of these substances and the use of the polyaluminosilazanes and of the ceramic materials.
摘要:
The present invention relates to a process for the production of low-needle silicon nitride of high .alpha.-content, wherein an amorphous nitrogen-containing silane compound is mixed with a crystalline or amorphous compound comprising the elements silicon, phosphorus and nitrogen to form a mixture which is heat-treated at temperatures above 1000.degree. C. to form the low-needle silicon nitride. The present invention also relates to the silicon-, nitrogen- and phosphorus-containing compound which is used as the starting material in the process for the production of the low-needle silicon nitride, and the process for the production of the silicon-, nitrogen-and phosphorus-containing compound.
摘要:
Chlorine-resistant elastic polyurethane urea fibers containing hydrotalcites coated with metal fatty acid salts which are useful in aqueous, chlorine-containing environments, such as for swimming pool liners, and process for their production.
摘要:
The present invention relates to polymeric multinary azanes built up from units of the general formula [E(NR.sup.1 R.sup.2).sub.a (NR.sup.3).sub.b/2 ], wherein E may be B,Al,Ga,In,Si,Ge,Ti, Zr, Hf,V,Nb,Ta,Cr,Mo or W and R.sup.1,R.sup.2,R.sup.3 may be H, C.sub.1 -C.sub.6 alkyl, vinyl or phenyl; methods for the preparation of these polymers and their use as precursors for high-performance ceramics.
摘要:
Silicon boron nitride ceramics are produced from polyborosilizanes obtained from polymerized Cl.sub.3 Si--NH--BClX wherein X is --Cl or --NH--Si--Cl.sub.3.
摘要:
The present invention relates to novel preceramic oligo- or polyborosilazane compounds having the structural feature Si--N--B, and to a ceramic material based on SiN and BN, to a process for the production thereof and to the use of the polyborosilazanes and the ceramic materials.
摘要:
The present invention relates to a process for the production of low-needle silicon nitride of high .alpha.-content, wherein an amorphous nitrogen-containing silane compound is mixed with a crystalline or amorphous compound comprising the elements silicon, phosphorus and nitrogen to form a mixture which is heat-treated at temperatures above 1000.degree. C. to form the low-needle silicon nitride. The present invention also relates to the silicon-, nitrogen- and phosphorus-containing compound which is used as the starting material in the process for the production of the low-needle silicon nitride, and the process for the production of the silicon-, nitrogen- and phosphorus-containing compound.