Reinforcement of alkaline earth aluminosilicate glass-ceramics

Claim 2

A whisker reinforced glass-ceramic matrix composite body having a use temperature up to 1300° C. consisting essentially of 10-60% by weight deagglomerated SiC whiskers having a thickness less than 100 microns with a length-to-diameter ratio of at least 10 substantially uniformly distributed in a glass-ceramic matrix consisting essentially, expressed in terms of weight percent on the oxide basis, of ______________________________________ CaO 0-25 MgO 0-15 SrO 0-30 Na.sub.2 O 0-4 CaO + SrO 10-30 K.sub.2 O 0-6 Al.sub.2 O.sub.3 25-38 TiO.sub.2 0-12 SiO.sub.2 35-60 ZrO.sub.2 0-15 BaO 0-25 As.sub.2 O.sub.3 0-3 BaO + MgO + Na.sub.2 O + K.sub.2 O + TiO.sub.2 ZrO.sub.2 + As.sub.2 O.sub.3 0-30 ______________________________________ wherein the predominant crystal phase in the glass-ceramic matrix is selected from the group of anorthite and its pseudo-binaries with mullite (3Al 2 O 3 .2SiO 2 ), cordierite (2MgO.2Al 2 O 3 .5SiO 2 ), barium osumilite (BaO.2MgO.3Al 2 O 3 .9SiO 2 ), albite solid solution (Na 2 O.Al 2 O 3 .6SiO 2 ), Al 2 O 3 , SiO 2 , CaO.SiO 2 , and gehlenite (2CaO.Al 2 O 3 .SiO 2 ).

Claim 3

A fiber reinforced glass-ceramic matrix composite body having a use temperature up to 1300° C. consisting essentially of 15-70% by volume SiC fibers substantially uniformly distributed in a glass-ceramic matrix consisting essentially, expressed in terms of weight percent on the oxide basis, of ______________________________________ CaO 0-25 MgO 0-15 SrO 0-30 Na.sub.2 O 0-4 CaO + SrO 10-30 K.sub.2 O 0-6 Al.sub.2 O.sub.3 25-38 TiO.sub.2 0-12 SiO.sub.2 35-60 ZrO.sub.2 0-15 BaO 0-25 As.sub.2 O.sub.3 0-3 BaO + MgO + Na.sub.2 O + K.sub.2 O + TiO.sub.2 ArO.sub.2 + As.sub.2 O.sub.3 0-30 ______________________________________ wherein the predominant crystal phase in the glass-ceramic matrix is selected from the group of anorthite and its pseudo-binaries with mullite ( 3Al.sub.2 O.sub.3.2SiO.sub.2), cordierite (2MgO.2Al.sub.2 O.sub.3.5SiO.sub.2), barium osumilite (BaO.2MgO.3Al.sub.2 O.sub.3.9SiO.sub.2), albite solid solution (Na.sub.2 O.Al.sub.2 O.sub.3.6SiO.sub.2), Al.sub.2 O.sub.3, SiO.sub.2, CaO.SiO.sub.2, and gehlenite (2CaO.Al.sub.2 O.sub.3.SiO.sub.2).

Claim 4

A fiber reinforced glass-ceramic matrix composite body having a use temperature up to 1300° C. consisting essentially of 15-70% by volume SiC fibers substantially uniformly distributed in a glass-ceramic matrix consisting essentially, expressed in terms of weight percent on the oxide basis, of ______________________________________ CaO 0-25 MgO 0-15 SrO 0-30 Na.sub.2 O 0-4 CaO + SrO 10-30 K.sub.2 O 0-6 Al.sub.2 O.sub.3 25-38 TiO.sub.2 0-12 SiO.sub.2 35-60 ZrO.sub.2 0-15 BaO 0-25 As.sub.2 O.sub.3 0-3 BaO + MgO + Na.sub.2 O + K.sub.2 O + TiO.sub.2 ArO.sub.2 + As.sub.2 O.sub.3 0-30 ______________________________________ wherein the predominant crystal phase in the glass-ceramic matrix is selected from the group of anorthite and its pseudo-binaries with mullite ( 3Al.sub.2 O.sub.3.2SiO.sub.2), cordierite (2MgO.2Al.sub.2 O.sub.3.5SiO.sub.2), barium osumilite (BaO.2MgO.3Al.sub.2 O.sub.3.9SiO.sub.2), albite solid solution (Na.sub.2 O.Al.sub.2 O.sub.3.6SiO.sub.2), Al.sub.2 O.sub.3, SiO.sub.2, CaO.SiO.sub.2, and gehlenite (2CaO.Al.sub.2 O.sub.3.SiO.sub.2).

Claim 5

A fiber and whisker reinforced glass-ceramic matrix hybrid composite body having a use temperature up to 1300° C. consisting essentially of about 15-70% by volume fibers selected from the group of SiC, graphite, B 4 C, BN, mullite, spinel, ZrO 2 , zircon, glass, and alumina and 10-60% by weight deagglomerated SiC whiskers having a thickness less than 100 microns with a length-to-diameter ratio of at least 10 substantially uniformly distributed in a glass-ceramic matrix consisting essentially, expressed in terms of weight percent on the oxide basis, of ______________________________________ CaO 0-25 MgO 0-15 SrO 0-30 Na.sub.2 O 0-4 CaO + SrO 10-30 K.sub.2 O 0-6 Al.sub.2 O.sub.3 25-38 TiO.sub.2 0-12 SiO.sub.2 35-60 ZrO.sub.2 0-15 BaO 0-25 As.sub.2 O.sub.3 0-3 BaO + MgO + Na.sub.2 O + K.sub.2 O + TiO.sub.2 ZrO.sub.2 + As.sub.2 O.sub.3 0-30 ______________________________________ wherein the predominant crystal phase in the glass-ceramic matrix is selected from the group of anorthite and its pseudo-binaries with mullite (3Al 2 O 3 .2SiO 2 ), cordierite (2MgO.2Al 2 O 3 .5SiO 2 ), barium osumilite (BaO.2MgO.3Al 2 O 3 .9SiO 2 ), and albite solid solution (Na 2 O.Al 2 O 3 .6SiO 2 ).

Claim 6

A fiber and whisker reinforced glass-ceramic matrix hybrid composite body having a use temperature up to 1300° C. consisting essentially of about 15-70% by volume fibers selected from the group of SiC, graphite, B 4 C, BN, mullite, spinel, ZrO 2 , zircon, glass, and alumina and 10-60% by weight deagglomerated SiC whiskers having a thickness less than 100 microns with a length-to-diameter ratio of at least 10 substantially uniformly distributed in a glass-ceramic matrix consisting essentially, expressed in terms of weight percent on the oxide basis, of ______________________________________ CaO 0-25 MgO 0-15 SrO 0-30 Na.sub.2 O 0-4 CaO + SrO 10-30 K.sub.2 O 0-6 Al.sub.2 O.sub.3 25-38 TiO.sub.2 0-12 SiO.sub.2 35-60 ZrO.sub.2 0-15 BaO 0-25 As.sub.2 O.sub.3 0-3 BaO + MgO + Na.sub.2 O + K.sub.2 O + TiO.sub.2 ZrO.sub.2 + As.sub.2 O.sub.3 0-30 ______________________________________ wherein the predominant crystal phase in the glass-ceramic matrix is selected from the group of anorthite and its pseudo-binaries with mullite (3Al 2 O 3 .2SiO 2 ), cordierite (2MgO.2Al 2 O 3 .5SiO 2 ), barium osumilite (BaO.2MgO.3Al 2 O 3 .9SiO 2 ), and albite solid solution (Na 2 O.Al 2 O 3 .6SiO 2 ).