Details

Autor(en) / Beteiligte

• Tokui, Kunihito
• Sakuragi, Susumu
• Sasaki, Takuya
• Yamada, Yutaka
• Ishihara, Mamoru
• Nakayama, Mamoru
• Kuji, Izumi
• Nomura, Mikio

Titel

Properties of Sintered Kovar Using Metal Injection Molding

Ist Teil von

• Journal of the Japan Society of Powder and Powder Metallurgy, 1994-01, Vol.41 (6), p.671-675

Erscheinungsjahr

1994

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• Thermal expansion properties and mechanical properties of the sintered Fe-Ni-Co alloys (Kovar), produced by the metal injection molding process using mixed and pre-alloyed powders, were investigated. The average thermal expansion coefficients of the Kovar between 323-673K were 4.82 x 10 exp -6 K exp -1 for the mixed powder compacts and 5.03x10 exp -6 K exp -1 for the prealloyed powder compacts in the condition of reducing carbon content, because the thermal expansion property of the sintered Kovar depends upon the C content. The thermal expansion coefficients of the mixed powder compacts were also influenced by the nickel content changing from 27 to 31 wt.%. The coefficients were 4.1 x 10 exp -6 and 11.4x10 exp -6 K exp -1 respectively. Reduction of silica (SiO sub 2 ) in iron for the mixed powder improved the mechanical properties of the sintered Kovar, resulting in a tensile strength of 460 MPa and an elongation of 36.4%. These properties exceed those of the sintered Kovar using prealloyed powder.