4 results about "Defense industry" patented technology

The invention relates to a composite liquid armor based on pure silica nanoparticles derived from sea sand and its production method. In our invention, composite liquid armor can be utilized in both military and civilian defense industries. Alongside its durability, the armor offers high performance, enables ease of movement, and features a lightweight, free-particle modular structure. By providing a domestic alternative, it reduces dependency on foreign technologies in this field.

The application discloses an ultrahigh dielectric constant transmitting piezoelectric ceramic material and a preparation method thereof, and belongs to the technical field of piezoelectric ceramic manufacturing. 1‑m‑n Sr m Ca n [(Mn 1 / 3 W 2 / 3 ) x (Co 1 / 3 Nb 2 / 3 ) y (Zr z Ti 1‑z ) 1‑x‑y ]O3+awt%Fe2O3+bwt%CeO2, wherein 0.06<=m<=0.10, 0<=n<=0.05, 0.03<=x<=0.10, 0.05<=y<=0.09, 0.47<=z<=0.53, 0<=a<=0.09, and 0<=b<=0.05. The prepared piezoelectric ceramic material not only has an ultrahigh dielectric constant (epsilon r3 T >=2600), but also has a high coupling coefficient (kp>=0.56), a low dielectric loss (tgdelta<=0.4%), a moderate mechanical quality factor (Q m >=400), and the like. The piezoelectric ceramic material is a transmitting piezoelectric ceramic material with excellent comprehensive performance, can meet diversified performance requirements of piezoelectric ceramic materials of a water sound emission transducer, and has a wide application prospect in the fields of water sound and national defense industry.

The invention discloses a high-toughness high-density low-activation refractory multi-component alloy and a preparation method and application thereof. The alloy is composed of three low-activation refractory elements W, Cr and Zr and O introduced through a contact environment in the preparation process. The alloy material is prepared from the following components in percentage by atom: 75.0 to 91.5 percent of W, 7.0 to 16.5 percent of Cr, 1.0 to 5.5 percent of Zr and 0.5 to 3.0 percent of O, wherein the ratio of the atomic fraction of Cr to the atomic fraction of Zr is 1.5-5.5, and the ratio of the atomic fraction of Zr to the atomic fraction of O is 0.5-2. According to the multi-component alloy disclosed by the invention, the room-temperature obdurability is remarkably improved while multiple advantages of pure W are reserved, and the multi-component alloy has the excellent characteristics of high density, high toughness, low activation, high temperature resistance and the like, and can be used as a high-performance heavy alloy to be applied to multiple fields such as aerospace, national defense industry, nuclear energy and the like.

This invention discloses a high-strength, high-toughness, low-activation refractory multi-component alloy, its preparation method, and its applications. The alloy is composed of three low-activation refractory elements: W, Cr, and Zr, as well as O introduced through contact with the environment during preparation. By atomic percentage, it consists of 75.0–91.5% W, 7.0–16.5% Cr, 1.0–5.5% Zr, and 0.5–3.0% O; wherein the atomic fraction ratio of Cr to Zr is 1.5–5.5, and the atomic fraction ratio of Zr to O is 0.5–2. This multi-component alloy retains many advantages of pure W while significantly improving room-temperature strength and toughness. It also possesses excellent properties such as high density, high strength and toughness, low activation, and high-temperature resistance, making it suitable as a high-performance heavy alloy for applications in aerospace, defense industry, nuclear energy, and many other fields.