The Boeing Company

The Institute of Metal Research

Ke Yang

Wei Wang

Wei Yan

Jialong Tian

Yiyin Shan

Hai Hui Wang

Sharafadeen Kunle Kolawole

Ziqing Sun

Ling Ren

Shuyuan Zhang

The present invention relates to the field of medical titanium alloy materials, and in particular, to a narrow-diameter high-strength implant-specific medical titanium alloy achieving immediate implant placement and a preparation method for the implant-specific medical titanium alloy. The medical titanium alloy is prepared from the following chemical components (by weight percentage), 14%-17% of Zr, 3.0%-10% of Cu, and the balance of Ti. The preparation method for the medical titanium alloy comprises: after cogging and forging and before rolling, performing heat preservation for 0.5-6 h at the temperature of 900-1200° C., and water cooling to the room temperature; and rolling at the temperature of 720-850° C., a strain rate being larger than 0.1 s−1, and a barstock obtained after rolling being used for subsequent implant processing. According to the narrow-diameter high-strength implant-specific medical titanium alloy achieving immediate implant placement provided in the present invention, immediate implant placement can be achieved without any surface treatment, and a firm combination of the implant and a bone tissue is achieved. According to the preparation method for the medical titanium alloy provided in the present invention, the implant having a narrow diameter (3.0-3.5 mm) can be prepared and is high in strength, and the purpose of firm implanting on a narrow teethridge missing a tooth is achieved.

Implant-specific medical titanium alloy achieving immediate implant placement and preparation method for implant-specific medical titanium alloy

An ultra-high strength maraging stainless steel with nominal composition (in mass) of C≤0.03%, Cr: 13.0-14.0%, Ni: 5.5-7.0%, Co: 5.5-7.5%, Mo: 3.0-5.0%, Ti: 1.9-2.5%, Si: ≤0.1%, Mn: ≤0.1%, P: ≤0.01%, S: ≤0.01%, and Fe: balance. The developed ultra-high strength maraging stainless steel combines ultra-high strength (with σb≥2000 MPa, σ0.2≥1700 MPa, δ≥8% and ψ≥40%), high toughness (KIC≥83 MPa·m1/2) and superior salt-water corrosion resistance (with pitting potential Epit≥0.15 (vs SCE)). Therefore, this steel is suitable to make structural parts that are used in harsh corrosive environments like marine environment containing chloride ions, etc.

Ultra-high strength maraging stainless steel with salt-water corrosion resistance

An ultra-high strength maraging stainless steel with nominal composition (in mass) of C&#x2264;0.03%, Cr: 13.0-14.0%, Ni: 5.5-7.0%, Co: 5.5-7.5%, Mo: 3.0-5.0%, Ti: 1.9-2.5%, Si: &#x2264;0.1%, Mn: &#x2264;0.1%, P: &#x2264;0.01%, S: &#x2264;0.01%, and Fe: balance. The developed ultra-high strength maraging stainless steel combines ultra-high strength (with &#x3c3;b&#x2265;2000 MPa, &#x3c3;0.2&#x2265;1700 MPa, &#x3b4;&#x2265;8% and &#x3c8;&#x2265;40%), high toughness (KIC&#x2265;83 MPa&#xb7;m&#xbd;) and superior salt-water corrosion resistance (with pitting potential Epit&#x2265;0.15 (vs SCE)). Therefore, this steel is suitable to make structural parts that are used in harsh corrosive environments like marine environment containing chloride ions, etc.

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Shenyang, China

Ke Yang