METHOD DETERMINING ADHESION STRENGTH OF DEPOSITED LAYER WITH BASIC MATERIAL Russian patent published in 1997 - IPC

FIELD: testing. SUBSTANCE: holes are made in basic material before deposition of cladding layer, embedding member with diameter d_h is installed in hole without clearance. Butt surface of embedding member is arranged flush with cladded surface of basic material, then cladding layer having thickness b is deposited with application of force to embedding member in direction perpendicular to adhesion surface till destruction of medium of cladding layer under embedding member is provided. Area F_sec of section is found from relationship F_sec=πd_oδ and adhesion strength is determined by taking it into account. Hole is blind from side of cladding layer. Embedding member in the form of washer having diameter d_o and cylindrical tail part is installed so that flat butt of washer conjugate to tail part is placed flush with claded surface. Part of cladding layer is fixed under washer by means of bushing by its setting on tail part of embedding member. After destruction of cladding layer depth of break is measured as distance 1 from edge of hole to line of adhesion of cladding layer with basic material. Diameter d₁ of this line is found from relationship d₁=2l+d_o, area F_br of break is determined from relationship F_br=πl(l+d_o). Adhesion strength of deposited layer with basic material is evaluated by value of ratio of area of break to area of section. Relationship F_br=0,5F_sec is chosen as criterion of equality of strength of zones of break and section. EFFECT: enhanced efficiency and authenticity of method. 3 dwg