초록 ▼

A reinforced composite material, having isotropic thermal expansion properties and a low coefficient of thermal expansion over at least the temperature range of from about 0째 C. to at least about 150째 C., which composite material comprises in combination a first continuous phase comprising a three d

A reinforced composite material, having isotropic thermal expansion properties and a low coefficient of thermal expansion over at least the temperature range of from about 0째 C. to at least about 150째 C., which composite material comprises in combination a first continuous phase comprising a three dimensional preformed bonded powder material reinforcement, including a bonding agent, and in which the bonded powder material is chosen from the group consisting of zirconium tungstate, hafnium tungstate, zirconium hafnium tungstate, and mixtures of zirconium tungstate and hafnium tungstate, and a second continuous phase matrix material chosen from the group consisting of aluminium, aluminium alloys in which aluminium is the major component, magnesium, magnesium alloys in which magnesium is the major component, titanium, titanium alloys in which titanium is the major component, engineering thermoplastics and engineering thermoplastics containing a conventional solid filler.

대표청구항 ▼

Having thus described the invention, what is claimed as new and secured by Letters Patent is: 1. A reinforced composite material, having isotropic thermal expansion properties and a low coefficient of thermal expansion over at least the temperature range of from about 0째 C. to at least about 150째 C

Having thus described the invention, what is claimed as new and secured by Letters Patent is: 1. A reinforced composite material, having isotropic thermal expansion properties and a low coefficient of thermal expansion over at least the temperature range of from about 0째 C. to at least about 150째 C., which composite material comprises in combination a first continuous phase comprising a three dimensional preformed bonded powder material reinforcement, including a bonding agent, and in which the bonded powder material is chosen from the group consisting of zirconium tungstate, hafnium tungstate, zirconium hafnium tungstate, and mixtures of zirconium tungstate and hafnium tungstate, and a second continuous phase matrix material chosen from the group consisting of aluminium, aluminium alloys in which aluminium is the major component, magnesium, magnesium alloys in which magnesium is the major component, titanium, titanium alloys in which titanium is the major component, engineering thermoplastics and engineering thermoplastics containing a conventional solid filler. 2. A composite material according to claim 1 wherein the bonding agent in the preformed bonded powder material reinforcement is silica. 3. A composite material according to claim 1 wherein the bonded powder material in the preformed bonded powder material reinforcement is zirconium tungstate. 4. A composite material according to claim 1 wherein the coefficient of thermal expansion of the composite material is between-1횞10-6/째 K. and +1횞10-6/째 K. over the temperature range of at least from about 0째 C. to at least about 150째 C. 5. A composite material according to claim 1 wherein the volume fraction of preformed bonded powder material reinforcement in the composite material is from about 40% to about 60%. 6. A composite material according to claim 1 wherein the volume fraction of preformed bonded powder material in the composite is substantially 50%. 7. A composite material according to claim 1 wherein the matrix material is aluminium or an aluminium alloy. 8. A reinforced metal matrix composite material, having isotropic thermal expansion properties and a low coefficient of thermal expansion over at least the temperature range of from about 0째 C. to at least about 150째 C., which composite material comprises in combination a first continuous phase comprising a three dimensional preformed bonded powder material reinforcement in which the bonded powder material is chosen from the group consisting of zirconium tungstate, hafnium tungstate, zirconium hafnium tungstate, and mixtures of zirconium tungstate and hafnium tungstate, and a second continuous phase matrix material chosen from the group consisting of aluminium, aluminium alloys in which aluminium is the major component, magnesium, and magnesium alloys in which magnesium is the major component. 9. A composite material according to claim 8 wherein the volume fraction of preformed bonded powder material reinforcement in the composite material is from about 40% to about 60%. 10. A composite material according to claim 8 wherein the volume fraction of preformed bonded powder material in the composite is substantially 50%. 11. A composite material according to claim 8 wherein the matrix material is aluminium or an aluminium alloy.