Odlewany kompozyt aluminiowy in situ umiacniany cząstkami borków tytanu

• Autorzy: Fraś E. , Janas A. , Kolbus A.

Warianty tytułu

EN

Cast in situ aluminium matrix composite reinforced with titanium boride particles

• Języki publikacji: PL

Abstrakty

PL

Przedstawiono syntezę borku tytanu TiB2 metodami: klasycznej syntezy SHS, syntezy SHSB oraz syntezy z soli. Umotywowano stosowanie cząstek borków tytanu jako fazy wzmacniającej w kompozytach. Przedstawiono struktury otrzymanych w ten sposób materiałów kompozytowych. Wykonano badania rentgenostrukturalne w celu identyfikacji faz tworzących się w osnowie aluminiowej po zajściu w niej wysokotemperaturowej reakcji syntezy borków tytanu.

EN

Mechanical properties of aluminium and its alloys can be improved by transformation of traditional material into a composite. This can be achieved by introducing to aluminium matrix the ceramic reinforcing particles, which gives material characterised by a high value of the strength/density ratio, specially at elevated temperatures. The reinforcing phase are mainly particles of SiC, TiC, Al2O3, and TiB2 - recently in wide application. From among various methods used for composite synthesis [4, 6, 7] the authors have chosen an in situ method. Among numerous materials which can be used as a reinforcement, the TiB2 particles are of particular interest as they are characterised by high hardness, high melting point and low density. From among various methods of the in situ synthesis, for TiB2 the authors have chosen the following variants: the TiB2 synthesis by traditional method of self-propagating high-temperature synthesis SHS, the TiB2 synthesis by self-propagating high-temperature synthesis in bath SHSB, the TiBi synthesis due to the reaction of exchange between the salt components. Due to the chemical reaction: m. K2TiF6 + 2n KBF4 = (m. + 2n) TiB2 + potassium fluorides. A titanium boride was formed which in the form of very fine suspension was transferred to aluminium matrix and settled in the interdendritic spaces. Conclusions: The self-propagating high-temperature synthesis of TiB2 takes place in a Ti-B-AI system resulting in the formation of a composite with the TiBi reinforcing phase. The crystals in this phase are relatively large (about 10 micrometers), while the composite material is porous. Applying the SHSB method and cooling of suspension in a die it is possible to produce a cast AI/TiB2 composite of the pre-assumed volume content of the reinforcing phase with particles rather small in size and amounting to 0.5 micrometers. From the studies it follows that the smallest particles of TiB2 of dimensions, are obtained in an AI/TiB2 composite due to the synthesis of these particles from a salt followed by a high cooling rate of the suspension.

Słowa kluczowe

PL

kompozyty; kompozyty aluminiowe; odlewy kompozytowe; borek tytanu; badania rentgenostrukturalne

EN

composites; aluminium matrix composites; titanium boride

• Wydawca: Wydawnictwo Politechniki Częstochowskiej
• Czasopismo: Kompozyty
• Rocznik: 2001
• Tom: R. 1, nr 1
• Strony: 23--27
• Opis fizyczny: Bibliogr. 12 poz., tab., wykr., rys.

Twórcy

autor

Fraś E.

• Akademia Górniczo-Hutnicza, Wydział Odlewnictwa, ul. Reymonta 23, 30-059 Kraków

autor

Janas A.

• Akademia Górniczo-Hutnicza, Wydział Odlewnictwa, ul. Reymonta 23, 30-059 Kraków

autor

Kolbus A.

• Akademia Górniczo-Hutnicza, Wydział Odlewnictwa, ul. Reymonta 23, 30-059 Kraków

Bibliografia

• [1] Wood J., Davies P., Kellie J.L.F., Properties of reactively cast aliminium - TiB2 alloys, Mater. Sci. Technol. 1993, 9, 833.
• [2] Tjong S.L., Lau K.C., Dry sliding wear of TiB2 particle reinforces aluminium alloy composites, Mater. Sci. Technol. 2000, 16, 99.
• [3] Stolarz S., Wysokotopliwe związki i fazy, Wydawnictwo Śląsk, Katowice 1980.
• [4] Loyd D.J., Particle reinforced aluminium and magnesium matrix composites, Internat. Mater. Rev. 1994, 39, 1, 1.
• [5] Amara A.,Yamamoto D, Garcia A., Modyfication and refinement treatment in cast Al-Si/SiC article composites, Trans. Am. Foundr. Soc. 1994, 169, 943.
• [6] Rohagi P.K., Astahana R., Cast reiforced metal composites, Ed Fishman SG, Dhingre AK.
• [7] SAM International, Metals Park Ohio 1988, 6.
• [8] Kumar K.S.,Bao G., Intermetallic-matrix composites: an overview, Compos. Sci. Technol. 1994, 52, 127.
• [9] Rohatgi P.K.,Weaver S.C., Metal matrix composites, Monitor UNIDO>Advanced in cast MMCs, Advan. Mater. Proc. 1990, 2, 39.
• [10] Janas A., Podstawy wytwarzania kompozytu Al+TiC i ocena jego wybranych właściwości mechanicznych, Praca doktorska, Wydz. Odlewnictwa AGH, Kraków 1998.
• [11] Fraś E., Janas A., Kolbus A., Lopez H., Metoda SHSB syntezy kompozytu „in situ” Al-TiC, IV Seminarium Kompozyty 2000 - Teoria i praktyka. Jaszowiec 29-31.04.2000, Wydawnictwo Politechniki Częstochowskiej, Częstochowa 2000, 201.
• [12] Munir Z.A., Anselmi T., Self-propagating exothermic reactions: The synthesis of high-temperature materials by combustion, Materials Science Reports 3, North-Holand, Amsterdam 1989, 277.