National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

Details

Casting Titanium and Zirconium in Zircon Sand Molds.

PB264253

Publication Date	1977
Personal Author	Koch, R. K.; Hoffman, J. L.; Transue, M. L.; Beall, R. A.
Page Count	48
Abstract	A zircon sand molding process was developed by the Bureau of Mines for static casting small titanium or zirconium shapes. Castings with unfinished weights up to 3.5 kg (7.7 lb) were produced in an inductoslag furnace and castings up to 7 kg (15.4 lb) were poured in a consumable electrode skull casting furnace. Molds and cores were made by ram molding foundry-grade zircon sand (AFS gfn 93 to 95) bonded by grade D waterglass and tempered with water. Molds and cores were cured either at 250C (482F) or 900C (1,652F). Castings from the higher temperature molds broke cleanly from the sand while the lower temperature molds produced castings that had to be cleaned by sandblasting. However, low-temperature cured molds and cores have a number of advantages: (1) A faster, less energy consuming curing cycle is used. (2) Expended cores are water soluble which greatly facilitates core removal. (3) Enough of the binder is crushed expended molds is reactivated by temper water so that the molding mix can be reused five times without any fresh binder addition; and up to twenty times without exceeding a total cumulative binder addition of 52 ml/kg dry sand. The most effective wash found for zirconium or titanium was monoclinic zirconia (325 mesh).
Keywords	Sand casting Titanium Zirconium Zirconium silicates Foundry sands Molds Cores Molding materials
Source Agency	Bureau of Mines
NTIS Subject Category	94G - Manufacturing Processes & Materials Handling
Corporate Authors	Bureau Of Mines, Albany, Oreg. Albany Metallurgy Research Center.
Document Type	Technical Report
Title Note	Rept. of investigations 1977.
NTIS Issue Number	197711

Casting Titanium and Zirconium in Zircon Sand Molds.

Casting Titanium and Zirconium in Zircon Sand Molds.
PB264253

Publication Date	1977
Personal Author	Koch, R. K.; Hoffman, J. L.; Transue, M. L.; Beall, R. A.
Page Count	48
Abstract	A zircon sand molding process was developed by the Bureau of Mines for static casting small titanium or zirconium shapes. Castings with unfinished weights up to 3.5 kg (7.7 lb) were produced in an inductoslag furnace and castings up to 7 kg (15.4 lb) were poured in a consumable electrode skull casting furnace. Molds and cores were made by ram molding foundry-grade zircon sand (AFS gfn 93 to 95) bonded by grade D waterglass and tempered with water. Molds and cores were cured either at 250C (482F) or 900C (1,652F). Castings from the higher temperature molds broke cleanly from the sand while the lower temperature molds produced castings that had to be cleaned by sandblasting. However, low-temperature cured molds and cores have a number of advantages: (1) A faster, less energy consuming curing cycle is used. (2) Expended cores are water soluble which greatly facilitates core removal. (3) Enough of the binder is crushed expended molds is reactivated by temper water so that the molding mix can be reused five times without any fresh binder addition; and up to twenty times without exceeding a total cumulative binder addition of 52 ml/kg dry sand. The most effective wash found for zirconium or titanium was monoclinic zirconia (325 mesh).
Keywords	Sand casting Titanium Zirconium Zirconium silicates Foundry sands Molds Cores Molding materials
Source Agency	Bureau of Mines
NTIS Subject Category	94G - Manufacturing Processes & Materials Handling
Corporate Authors	Bureau Of Mines, Albany, Oreg. Albany Metallurgy Research Center.
Document Type	Technical Report
Title Note	Rept. of investigations 1977.
NTIS Issue Number	197711