Heat transfer mixture and method

A method of forming a heat transfer fluid, the method comprising:

• dispersing an aluminum oxide powder in water to form a slurry;
• combining the slurry with water to form a first combination;
• adding a first amount of a chelating agent to the first combination to form a second combination;
• adding a first amount of a surfactant to the second combination to form a third combination;
• adding one of the group selected from propylene glycol and ethylene glycol to the third combination to form a fourth combination;
• adding a second amount of the chelating agent to the fourth combination to form a fifth combination;
• adding a second amount of the surfactant to the fifth combination to form a sixth combination;
• and
• mixing the sixth combination to form the heat transfer fluid, wherein the chelating agent comprises a sodium salt solution of polyamino-polyether-methylene-phosphonic acid,
• wherein the surfactant comprises ammonium salt polyacrylate, and
• wherein the first amount of the chelating agent is greater than the second amount of the chelating agent.

A method of forming a heat transfer fluid, the method comprising:

• dispersing an aluminum oxide powder in water to form a slurry;
• combining the slurry with water to form a first combination;
• adding a first amount of a chelating agent to the first combination to form a second combination;
• adding a first amount of a surfactant to the second combination to form a third combination;
• adding one of the group selected from propylene glycol and ethylene glycol to the third combination to form a fourth combination;
• milling the fourth combination for about 45 minutes;
• adding a second amount of the chelating agent to the fourth combination after milling the fourth combination to form a fifth combination;
• adding a second amount of the surfactant to the fifth combination to form a sixth combination;
• wet milling the sixth combination;
• and
• mixing the sixth combination for about 30 minutes to form the heat transfer fluid after wet milling the sixth combination,
• wherein the chelating agent comprises a sodium salt solution of polyamino-polyether-methylene-phosphonic acid, and
• wherein the surfactant comprises ammonium salt polyacrylate,
• wherein the first amount of the chelating agent is 2 times greater than the second amount of the chelating agent,
• wherein the first amount of the surfactant is 2 times greater than the second amount of the surfactant,
• wherein the aluminum oxide powder comprises a particle size between about 100 nanometers and about 600 nanometers,
• wherein the heat transfer mixture comprises between about 1% by volume and about 20% by volume of the aluminum oxide powder,
• wherein the heat transfer mixture comprises between about 0.1% by volume and about 3% by volume of the chelating agent,
• wherein the heat transfer mixture comprises between about 0.1% by volume and about 3% by volume of the surfactant,
• wherein the heat transfer mixture has a pH greater than 8.5, and
• wherein the heat transfer mixture is free of carbon nanoparticles.